Multi-power-supply power supply system for PLC expansion IO module

Abstract

The utility model discloses a multi-power-supply power supply system for a PLC (Programmable Logic Controller) expansion IO (Input / Output) module, and particularly relates to the technical field of PLC power supply, which is technically characterized in that the multi-power-supply power supply system comprises a PLC host, a plurality of power supply modules and a plurality of IO modules, and the PLC host and the plurality of power supply modules are connected with external power supply equipment through a system power supply bus; the PLC host is respectively connected with the plurality of power supply modules through power supply control lines, and each power supply module is respectively connected with at least one IO module through a power line; a plurality of power supply modules are expanded and arranged, and each power supply module is respectively connected with at least one expanded IO module, so that the technical problem that the power supply module cannot be normally started possibly due to the fact that a single power supply module is connected with a plurality of IO modules and instant current is sharply increased when all IO modules are started at the same time is solved; and meanwhile, the PLC host is respectively connected with the plurality of power supply modules through the power supply control lines, so that the power supply time sequence of the plurality of power supply modules can be controlled to meet the control requirements of different starting time sequences.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of PLC power supply, specifically relates to a kind of multi-power supply system for PLC extension IO module. BACKGROUND

[0002] PLC usually increases its own input and output resources by extending IO module, and the system power of PLC itself is usually carried to supply power to the extended IO module, or a power module is further extended to supply power to all IO modules. When the power module starts to supply power, all IO modules are powered, and all IO modules are powered at the same time. In this power supply mode, as the number of IO modules increases, the load of power supply increases, and the power supply current of the power module also increases, especially at the moment of simultaneous start of all IO modules. Due to the internal capacitance of the IO module, the current at the moment of start increases sharply, which may cause the power module to fail to start normally, thereby causing the system to fail to start. At the same time, when the IO module starts, the power-on start timing needs to be controlled. For all IO modules connected to the same power module, it is impossible to meet the control requirements of different start timings.

[0003] Therefore, the utility model aims to solve the above-mentioned related problems by a multi-power supply system for PLC extension IO module. UTILITY MODEL CONTENT

[0004] The utility model solves the technical problem that the current increases sharply at the moment of simultaneous start of all IO modules in the prior art, which may cause the power module to fail to start normally, and all IO modules are connected to the same power module, which cannot meet the control requirements of different start timings. The utility model aims to provide a multi-power supply system for PLC extension IO module, which solves the technical problem that the current increases sharply at the moment of simultaneous start of all IO modules connected to a single power module, which may cause the power module to fail to start normally. The PLC host is connected to multiple power modules through power control lines, so that the power supply timing of multiple power modules can be controlled to meet the control requirements of different start timings.

[0005] The utility model is implemented by the following technical solutions:

[0006] A kind of multiple power supply system for PLC extension IO module, system includes: PLC host, multiple power modules and multiple IO modules, PLC host and multiple power modules are connected with external power supply equipment by system power bus, PLC host is connected with multiple power modules by power control line respectively, and each power module is connected with at least one IO module by power line respectively, and PLC host is connected with multiple IO modules by communication line.

[0007] Further, the number of power modules is two, the number of IO modules is four, PLC host is connected with two power modules by power control line respectively, and each power module is connected with at least one IO module by power line respectively, and PLC host is connected with two power modules and four IO modules by communication line respectively.

[0008] Further, the number of power modules is two, the number of IO modules is six, PLC host is connected with two power modules by power control line respectively, and each power module is connected with at least one IO module by power line respectively, and PLC host is connected with two power modules and six IO modules by communication line respectively.

[0009] Further, the number of power modules is three, the number of IO modules is six, PLC host is connected with three power modules by power control line respectively, and each power module is connected with at least one IO module by power line respectively, and PLC host is connected with three power modules and six IO modules by communication line respectively.

[0010] Further, the number of power modules is three, the number of IO modules is nine, PLC host is connected with three power modules by power control line respectively, and each power module is connected with at least one IO module by power line respectively, and PLC host is connected with three power modules and nine IO modules by communication line respectively.

[0011] Further, the number of power modules is four, the number of IO modules is eight, PLC host is connected with four power modules by power control line respectively, and each power module is connected with at least one IO module by power line respectively, and PLC host is connected with four power modules and eight IO modules by communication line respectively.

[0012] Further, PLC host includes first controller, first communication interface, first power interface and first internal bus interface, first communication interface and first internal bus interface are connected with first controller, and first power interface is connected with first controller, first communication interface and first internal bus interface respectively.

[0013] Further, the plurality of power modules each comprise a second controller, a second communication interface, a second power interface, a DC-DC converter and a second internal bus interface, the second communication interface, the second internal bus interface and the DC-DC converter are connected with the second controller, and the second power interface is connected with the second internal bus interface, the second controller, the second communication interface and the DC-DC converter respectively.

[0014] Further, the first communication interface is connected with the plurality of second communication interfaces through power control lines respectively, the first internal bus interface is connected with the plurality of second internal bus interfaces through communication lines respectively, each DC-DC converter is connected with at least one IO module, and the first power interface and the plurality of second power interfaces are connected with an external power supply device.

[0015] Further, the external power supply device adopts a switching power supply.

[0016] Compared with the prior art, the utility model has the following advantages and beneficial effects:

[0017] In the utility model, through setting plurality of power modules is expanded, and through each power module is connected with at least one IO module expanded respectively, the technical problem that the current sharply increases in the moment when simultaneously starting due to single power module connecting more IO modules, and power module can not normally start possibly is solved, and the power supply timing of plurality of power modules can be controlled by PLC host computer through power control line and plurality of power modules are connected respectively, to meet the control requirement of different starting timing. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme of the exemplary embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiments, and it should be understood that the following drawings only show some embodiments of the utility model, and therefore should not be regarded as the limitation to the scope, and for the ordinary skilled person in the art, other related drawings can also be obtained according to these drawings without the creative labor, and in the drawings:

[0019] Figure 1 The system structure schematic drawing of a plurality of power supply systems for PLC extended IO module is provided for example 1;

[0020] Figure 2 The system structure schematic drawing of a plurality of power supply systems for PLC extended IO module is provided for example 2;

[0021] Figure 3 The system structure schematic drawing of a plurality of power supply systems for PLC extended IO module is provided for example 3;

[0022] Figure 4 A system structure diagram of a multi-power supply system for a PLC expansion IO module provided for Embodiment 4;

[0023] Figure 5 A system structure diagram of a multi-power supply system for a PLC expansion IO module provided for Embodiment 5;

[0024] Figure 6 A partial structure diagram of a PLC host in a multi-power supply system for a PLC expansion IO module provided for Embodiments 1-3;

[0025] Figure 7 A partial structure diagram of a power supply module in a multi-power supply system for a PLC expansion IO module provided for Embodiments 1-3;

[0026] Figure 8 A partial structure diagram of a PLC host in a multi-power supply system for a PLC expansion IO module provided for Embodiments 4-5;

[0027] Figure 9 A partial structure diagram of a power supply module in a multi-power supply system for a PLC expansion IO module provided for Embodiments 4-5.

[0028] Markings in the drawings and corresponding names of parts:

[0029] 1, PLC host; 101, first controller; 102, first communication interface; 103, first power supply interface; 104, first internal bus interface; 2, power supply module; 201, second controller; 202, second communication interface; 203, second power supply interface; 204, DC-DC converter; 205, second internal bus interface; 3, IO module; 4, external power supply device; 5, system power bus; 6, power supply control line; 7, power supply line; 8, communication line. DETAILED DESCRIPTION

[0030] Exemplary embodiments of the present disclosure are described herein with reference to the accompanying drawings, which are provided for the purpose of illustration only. The details of the embodiments of the present disclosure are described herein for the purpose of providing what is believed to be the presently understood best and most readily understood description, but it should be understood that structural modifications can be resorted to by one skilled in the art, without departing from the scope of the present disclosure. Likewise, it should be understood that the features of the various embodiments described herein can be combined with each other, unless expressly stated otherwise.

[0031] In the present disclosure, the terms "first", "second", etc. used in the description of various examples are not intended to limit the positional relationship, timing relationship or importance relationship of the elements, and such terms are only used to distinguish one element from another. In some examples, the first element and the second element can refer to the same instance of the element, and in some cases, based on the context of the description, they can also refer to different instances.

[0032] The terms used in the description of various examples in the present disclosure are only for the purpose of describing the specific examples, and are not intended to be limiting. Unless the context clearly indicates otherwise, if the number of elements is not specifically limited, the element can be one or more. In addition, the term "and / or" used in the present disclosure encompasses any one of the listed items and all possible combinations.

[0033] Embodiment 1

[0034] In one embodiment, referring to Figure 1 The present embodiment provides a multi-power supply system for a PLC expansion IO module, which comprises a PLC host 1, two power modules 2 and four IO modules 3. The PLC host 1 and the two power modules 2 are connected with an external power supply device 4 through a system power bus 5. The PLC host 1 is connected with the two power modules 2 through a power control line 6. Each power module 2 is connected with at least one IO module 3 through a power line 7. The PLC host 1 is connected with the two power modules 2 and the four IO modules 3 through a communication line 8. It should be noted that in the present embodiment, the PLC host 1 is connected with the power module 2 through the communication line 8, which can improve the stability of communication.

[0035] Meanwhile, in the present embodiment, referring to Figures 6-7 The PLC host 1 comprises a first controller 101, a first communication interface 102, a first power supply interface 103 and a first internal bus interface 104. The first communication interface 102 and the first internal bus interface 104 are connected with the first controller 101. The first power supply interface 103 is connected with the first controller 101, the first communication interface 102 and the first internal bus interface 104 respectively. It should be noted that the PLC host 1 also comprises other functional modules, which will not be described here.

[0036] The two power modules 2 each include a second controller 201, a second communication interface 202, a second power supply interface 203, a DC-DC converter 204, and a second internal bus interface 205, the second communication interface 202, the second internal bus interface 205, and the DC-DC converter 204 are connected with the second controller 201, the second power supply interface 203 is connected with the second internal bus interface 205, the second controller 201, the second communication interface 202, and the DC-DC converter 204 respectively, and it should be noted that the power module 2 further includes other functional modules, which are not described here in detail.

[0037] The first communication interface 102 is connected with the two second communication interfaces 202 through the power supply control lines 6 respectively; the first internal bus interface 104 is connected with the two second internal bus interfaces 205 and the four IO modules 3 through the communication lines 8 respectively, and each DC-DC converter 204 is connected with two IO modules 3; the first power supply interface 103 and the two second power supply interfaces 203 are connected with the external power supply device 4.

[0038] It should be noted that in the embodiment, the model of the first controller 101 of the PLC host 1 is MIMX8DX5CVLFZAC, and the first power supply interface 103 is a conventional power supply input interface. Since the internal communication and external communication of the PLC host 1 in the embodiment both select CAN communication, a CAN transceiver is arranged at the first internal bus interface 104 and the first communication interface 102, and the model of the CAN transceiver of the first internal bus interface 104 and the model of the CAN transceiver of the first communication interface 102 are both TJA1042BT.

[0039] Meanwhile, the external power supply device 4 is powered by a switching power supply, which converts commercial power (AC 220V) into a direct current voltage (for example, DC 24V) required by the PLC for power supply. This technology is a conventional technical means in the art, and will not be described here in detail.

[0040] Meanwhile, the model of the second controller 201 of the power module 2 is GD32F470VIT6, the model of the CAN transceiver of the second communication interface 202 is TJA1042BT, the model of the CAN transceiver of the second internal bus interface 205 is TJA1042BT, the model of the DC-DC converter 204 is TPS54560DDAR, the DC-DC converter 204 can convert 24V voltage into 5V voltage, and the second power supply interface 203 is a conventional power supply input interface.

[0041] In the embodiment, when the system is powered on, the first controller 101 of the PLC host 1 sends a command to each power module 2 through the first communication interface 102, so that each power module 2 is controlled to be powered on one by one, and the purpose of timing control power-on is achieved. After receiving the power-on command sent by the PLC host 1, the second controller 201 controls the EN pin of the DC-DC converter 204 according to the regulation, so that the DC-DC converter 204 is enabled, and then the DC-DC converter 204 supplies power to the subsequent IO module 3.

[0042] Meanwhile, in the embodiment, each power module 2 is connected with two IO modules 3, and in other embodiments, the connection mode of “one power module 2 connected with one IO module 3, and one power module 2 connected with three IO modules 3” can be adopted, which is not limited here.

[0043] Working principle: connect the PLC host 1 and the two power modules 2 with the external power supply device 4, power the PLC host 1 and the two power modules 2 through the external power supply device 4, then connect the two power modules 2 with the four IO modules 3 respectively, and provide power support for the four IO modules 3 through the two power modules 2 respectively, and at the same time, connect the PLC host 1 with the two power modules 2, and control the start and stop of the two power modules 2 through the PLC host 1, so as to meet the control requirements of different start timing.

[0044] Embodiment 2

[0045] In another embodiment, as shown in Figure 2 , the embodiment provides a multi-power supply system for PLC extended IO module, which comprises a PLC host 1, two power modules 2 and six IO modules 3. The PLC host 1 and the two power modules 2 are connected with an external power supply device 4 through a system power bus 5. The PLC host 1 is connected with the two power modules 2 through a power control line 6 respectively. Each power module 2 is connected with at least one IO module 3 through a power line 7 respectively. The PLC host 1 is connected with the two power modules 2 and the six IO modules 3 through a communication line 8 respectively. It should be noted that in the embodiment, the PLC host 1 is connected with the power module 2 through the communication line 8, which can improve the stability of communication.

[0046] Meanwhile, in the embodiment, as shown in Figures 6-7 , the PLC host 1 comprises a first controller 101, a first communication interface 102, a first power interface 103 and a first internal bus interface 104. The first communication interface 102 and the first internal bus interface 104 are connected with the first controller 101. The first power interface 103 is connected with the first controller 101, the first communication interface 102 and the first internal bus interface 104 respectively. It should be noted that the PLC host 1 also comprises other functional modules, which are not described here.

[0047] The two power modules 2 each include a second controller 201, a second communication interface 202, a second power supply interface 203, a DC-DC converter 204, and a second internal bus interface 205, the second communication interface 202, the second internal bus interface 205, and the DC-DC converter 204 are connected with the second controller 201, the second power supply interface 203 is connected with the second internal bus interface 205, the second controller 201, the second communication interface 202, and the DC-DC converter 204 respectively, and it should be noted that the power module 2 also includes other functional modules, which are not described here.

[0048] The first communication interface 102 is connected with the two second communication interfaces 202 through the power control lines 6 respectively; the first internal bus interface 104 is connected with the two second internal bus interfaces 205 and the six IO modules 3 through the communication lines 8 respectively, and each DC-DC converter 204 is connected with three IO modules 3; the first power supply interface 103 and the two second power supply interfaces 203 are connected with the external power supply device 4.

[0049] It should be noted that in the embodiment, the model of the first controller 101 of the PLC host 1 is MIMX8DX5CVLFZAC, and the first power supply interface 103 adopts a conventional power input interface, since the internal communication and external communication of the PLC host 1 in the embodiment both select CAN communication, a CAN transceiver is arranged at the first internal bus interface 104 and the first communication interface 102, and the model of the CAN transceiver of the first internal bus interface 104 and the model of the CAN transceiver of the first communication interface 102 both adopt TJA1042BT;

[0050] Meanwhile, the external power supply device 4 adopts a switching power supply for power supply, the switching power supply converts commercial power (AC220V) into a direct current voltage (for example, DC24V) required by the PLC for power supply, and this technology is a conventional technical means in the field, which is not described here in detail;

[0051] Meanwhile, the model of the second controller 201 of the power module 2 adopts GD32F470VIT6, the model of the CAN transceiver of the second communication interface 202 adopts TJA1042BT, the model of the CAN transceiver of the second internal bus interface 205 adopts TJA1042BT, the model of the DC-DC converter 204 adopts TPS54560DDAR, the DC-DC converter 204 can convert a 24V voltage into a 5V voltage, and the second power supply interface 203 adopts a conventional power input interface;

[0052] In the embodiment, when the system is powered on, the first controller 101 of the PLC host 1 sends a command to each power module 2 through the first communication interface 102, so that each power module 2 is controlled to be powered on one by one, and the purpose of timing control power on is achieved. After receiving the power-on command sent by the PLC host 1, the second controller 201 controls the EN pin of the DC-DC converter 204 according to the regulation, so that the DC-DC converter 204 is enabled, and then the DC-DC converter 204 supplies power to the subsequent IO module 3.

[0053] Meanwhile, in the embodiment, each power module 2 is connected with three IO modules 3, and in other embodiments, the connection mode of “one power module 2 connected with two IO modules 3, one power module 2 connected with four IO modules 3” can be adopted, which is not limited here.

[0054] Working principle: connect the PLC host 1 and the two power modules 2 with the external power supply device 4, power the PLC host 1 and the two power modules 2 through the external power supply device 4, then connect the two power modules 2 with the six IO modules 3 respectively, provide power support for the six IO modules 3 through the two power modules 2 respectively, and connect the PLC host 1 with the two power modules 2, control the start and stop of the two power modules 2 through the PLC host 1, so as to meet the control requirements of different start timing.

[0055] Embodiment 3

[0056] In another embodiment, as shown in Figure 3 , the embodiment provides a multi-power supply system for PLC extended IO module, which comprises a PLC host 1, three power modules 2 and six IO modules 3. The PLC host 1 and the three power modules 2 are connected with an external power supply device 4 through a system power bus 5. The PLC host 1 is connected with the three power modules 2 through a power control line 6 respectively. Each power module 2 is connected with at least one IO module 3 through a power line 7 respectively. The PLC host 1 is connected with the three power modules 2 and the six IO modules 3 through a communication line 8 respectively. It should be noted that in the embodiment, the PLC host 1 is connected with the power module 2 through the communication line 8, which can improve the stability of communication.

[0057] Meanwhile, in the embodiment, as shown in Figures 6-7 , the PLC host 1 comprises a first controller 101, a first communication interface 102, a first power supply interface 103 and a first internal bus interface 104. The first communication interface 102 and the first internal bus interface 104 are connected with the first controller 101. The first power supply interface 103 is connected with the first controller 101, the first communication interface 102 and the first internal bus interface 104 respectively. It should be noted that the PLC host 1 also comprises other functional modules, which are not described here.

[0058] The three power supply modules 2 each include a second controller 201, a second communication interface 202, a second power supply interface 203, a DC-DC converter 204, and a second internal bus interface 205, the second communication interface 202, the second internal bus interface 205, and the DC-DC converter 204 are connected with the second controller 201, the second power supply interface 203 is connected with the second internal bus interface 205, the second controller 201, the second communication interface 202, and the DC-DC converter 204 respectively, and it should be noted that the power supply module 2 also includes other functional modules, which will not be described here.

[0059] The first communication interface 102 is connected with the three second communication interfaces 202 through the power supply control lines 6 respectively; the first internal bus interface 104 is connected with the three second internal bus interfaces 205 and the six IO modules 3 through the communication lines 8 respectively, and each DC-DC converter 204 is connected with two IO modules 3, and the first power supply interface 103 and the three second power supply interfaces 203 are connected with the external power supply device 4.

[0060] It should be noted that in the embodiment, the model of the first controller 101 of the PLC host 1 adopts MIMX8DX5CVLFZAC, and the first power supply interface 103 adopts a conventional power supply input interface, since the internal communication and the external communication of the PLC host 1 in the embodiment both select CAN communication, a CAN transceiver is arranged at the first internal bus interface 104 and the first communication interface 102, and the model of the CAN transceiver of the first internal bus interface 104 and the model of the CAN transceiver of the first communication interface 102 both adopt TJA1042BT;

[0061] At the same time, the external power supply device 4 adopts a switching power supply for power supply, the switching power supply converts commercial power (AC220V) into a direct current voltage (for example, DC24V) required by the PLC for power supply, and this technology is a conventional technical means in the field, which will not be described here;

[0062] At the same time, the model of the second controller 201 of the power supply module 2 adopts GD32F470VIT6, the model of the CAN transceiver of the second communication interface 202 adopts TJA1042BT, the model of the CAN transceiver of the second internal bus interface 205 adopts TJA1042BT, the model of the DC-DC converter 204 adopts TPS54560DDAR, the DC-DC converter 204 can convert 24V voltage into 5V voltage, and the second power supply interface 203 adopts a conventional power supply input interface;

[0063] In the embodiment, when the system is powered on, the first controller 101 of the PLC host 1 issues a command to each power module 2 through the first communication interface 102, so that each power module 2 is controlled to be powered on one by one, and the purpose of timing control power-on is achieved. After receiving the power-on command issued by the PLC host 1, the second controller 201 controls the EN pin of the DC-DC converter 204 according to the regulation, so that the DC-DC converter 204 is enabled, and then the DC-DC converter 204 supplies power to the subsequent IO module 3.

[0064] Meanwhile, in the embodiment, each power module 2 is connected with two IO modules 3, and in other embodiments, the connection mode of “one power module 2 connected with one IO module 3, one power module 2 connected with two IO modules 3, and one power module 2 connected with three IO modules 3” can be adopted, and no more limitation is made here.

[0065] Working principle: connect the PLC host 1 and the three power modules 2 with the external power supply device 4, supply power to the PLC host 1 and the three power modules 2 through the external power supply device 4, then connect the three power modules 2 with the six IO modules 3 respectively, provide power support for the six IO modules 3 through the three power modules 2 respectively, and connect the PLC host 1 with the three power modules 2, control the start and stop of the three power modules 2 through the PLC host 1, so as to meet the control requirements of different start timing.

[0066] Embodiment 4

[0067] In another embodiment, referring to Figure 4 , the embodiment provides a multi-power supply system for PLC expansion IO module, which comprises a PLC host 1, three power modules 2 and nine IO modules 3. The PLC host 1 and the three power modules 2 are connected with an external power supply device 4 through a system power bus 5. The PLC host 1 is connected with the three power modules 2 through a power control line 6 respectively. Each power module 2 is connected with at least one IO module 3 through a power line 7 respectively. The PLC host 1 is connected with the three power modules 2 and the nine IO modules 3 through a communication line 8 respectively. It should be noted that in the embodiment, the PLC host 1 is connected with the power module 2 through the communication line 8, which can improve the stability of communication.

[0068] Meanwhile, in the embodiment, referring to Figures 8-9As shown, the PLC host 1 includes a first controller 101, a first communication interface 102, a first power supply interface 103, and a first internal bus interface 104, the first communication interface 102 and the first internal bus interface 104 are connected with the first controller 101, the first power supply interface 103 is connected with the first controller 101, the first communication interface 102, and the first internal bus interface 104 respectively, and it should be noted that the PLC host 1 also includes other functional modules, which will not be described here.

[0069] Each of the three power supply modules 2 includes a second controller 201, a second communication interface 202, a second power supply interface 203, a DC-DC converter 204, and a second internal bus interface 205, the second communication interface 202, the second internal bus interface 205, and the DC-DC converter 204 are connected with the second controller 201, the second power supply interface 203 is connected with the second internal bus interface 205, the second controller 201, the second communication interface 202, and the DC-DC converter 204 respectively, and it should be noted that the power supply module 2 also includes other functional modules, which will not be described here.

[0070] The first communication interface 102 is connected with the three second communication interfaces 202 through the power supply control lines 6 respectively; the first internal bus interface 104 is connected with the three second internal bus interfaces 205 and the nine IO modules 3 through the communication lines 8 respectively, each DC-DC converter 204 is connected with the three IO modules 3, and the first power supply interface 103 and the three second power supply interfaces 203 are connected with the external power supply device 4.

[0071] It should be noted that in the embodiment, the model of the first controller 101 of the PLC host 1 adopts MIMX8DX5CVLFZAC, the first power supply interface 103 adopts a conventional power supply input interface, the first internal bus interface 104 is provided with a CAN transceiver, and the model of the CAN transceiver of the first internal bus interface 104 adopts TJA1042BT, and since the first communication interface 102 of the PLC host 1 in the embodiment adopts a GPIO communication port, the first communication interface 102 adopts a DO interface;

[0072] At the same time, the external power supply device 4 adopts a switching power supply for power supply, and the switching power supply converts commercial power (AC220V) into a direct current voltage (for example, DC24V) required by the PLC for power supply, which is a conventional technical means in the art, and will not be described here;

[0073] Meanwhile, the model of the second controller 201 of the power module 2 is GD32F470VIT6, the model of the second internal bus interface 205 is TJA1042BT, the model of the DC-DC converter 204 is TPS54560DDAR, the DC-DC converter 204 can convert 24V voltage into 5V voltage, and the second power interface 203 is a conventional power input interface; meanwhile, the second communication interface 202 is set as one DO interface and one DI interface, the DO interface of the PLC host 1 is connected with the DI interface of one power module 2, and then the DO interface of the power module 2 is connected with the DI interface of the next power module 2, and the same is true for the subsequent power modules 2;

[0074] In the embodiment, when the system is powered on, the DI interface and the DO interface of the PLC host 1 and each power module 2 are at low level by default, after the PLC host 1 is initialized, the subsequent power modules 2 are powered on one by one, and the specific process is that the PLC pulls up the DO interface level, the DI interface level of the first power module 2 changes from low to high, which means that the PLC host 1 commands the power module 2 to start powering on, and when the DI interface level changes from high to low, the power module 2 enables the DC-DC converter 204 to work and starts powering on the subsequent connected IO module 3, and the power module 2 pulls up the DO interface level after the power on is completed, so as to cause the DI interface level of the next power module 2 to change from low to high, thereby repeating the above operation to complete the power-on process.

[0075] Meanwhile, in the embodiment, each power module 2 is connected with three IO modules 3, and in other embodiments, the connection mode of “one power module 2 connected with two IO modules 3, one power module 2 connected with three IO modules 3, and one power module 2 connected with four IO modules 3” can be adopted, which is not limited here.

[0076] Working principle: connect the PLC host 1 and the three power modules 2 with the external power supply device 4, power the PLC host 1 and the three power modules 2 through the external power supply device 4, then connect the three power modules 2 with the nine IO modules 3 respectively, provide power support for the nine IO modules 3 through the three power modules 2, and connect the PLC host 1 with the three power modules 2, control the start and stop of the three power modules 2 through the PLC host 1, so as to meet the control requirements of different start sequences.

[0077] Embodiment 5

[0078] In another embodiment, referring to Figure 5As shown, the embodiment provides a multi-power supply system for PLC expansion IO module, which comprises a PLC host 1, four power modules 2 and eight IO modules 3. The PLC host 1 and the four power modules 2 are connected with an external power supply device 4 through a system power bus 5. The PLC host 1 is connected with the four power modules 2 through a power control line 6. Each power module 2 is connected with at least one IO module 3 through a power line 7. The PLC host 1 is connected with the four power modules 2 and the eight IO modules 3 through a communication line 8. It should be noted that in the embodiment, the PLC host 1 is connected with the power modules 2 through the communication line 8, which can improve the stability of communication.

[0079] Meanwhile, in the embodiment, referring to Figures 8-9 As shown, the PLC host 1 comprises a first controller 101, a first communication interface 102, a first power interface 103 and a first internal bus interface 104. The first communication interface 102 and the first internal bus interface 104 are connected with the first controller 101. The first power interface 103 is connected with the first controller 101, the first communication interface 102 and the first internal bus interface 104 respectively. It should be noted that the PLC host 1 further comprises other functional modules, which will not be described here.

[0080] The four power modules 2 each comprise a second controller 201, a second communication interface 202, a second power interface 203, a DC-DC converter 204 and a second internal bus interface 205. The second communication interface 202, the second internal bus interface 205 and the DC-DC converter 204 are connected with the second controller 201. The second power interface 203 is connected with the second internal bus interface 205, the second controller 201, the second communication interface 202 and the DC-DC converter 204 respectively. It should be noted that the power module 2 further comprises other functional modules, which will not be described here.

[0081] The first communication interface 102 is connected with the four second communication interfaces 202 through the power control line 6. The first internal bus interface 104 is connected with the four second internal bus interfaces 205 and the eight IO modules 3 through the communication line 8. Each DC-DC converter 204 is connected with two IO modules 3. The first power interface 103 and the four second power interfaces 203 are connected with the external power supply device 4.

[0082] It should be noted that in the present embodiment, the model of the first controller 101 of the PLC host 1 adopts MIMX8DX5CVLFZAC, the first power supply interface 103 adopts a conventional power supply input interface, the first internal bus interface 104 is provided with a CAN transceiver, and the model of the CAN transceiver of the first internal bus interface 104 adopts TJA1042BT. Since the first communication interface 102 of the PLC host 1 in the present embodiment adopts a GPIO communication port, the first communication interface 102 adopts a DO interface;

[0083] Meanwhile, the external power supply device 4 adopts a switching power supply for power supply, and the switching power supply converts commercial power (AC 220V) into a direct current voltage (for example, DC 24V) required by the PLC for power supply. This technology is a conventional technical means in the art, and will not be described in detail here.

[0084] Meanwhile, the model of the second controller 201 of the power supply module 2 adopts GD32F470VIT6, the model of the second internal bus interface 205 adopts TJA1042BT, the model of the DC-DC converter 204 adopts TPS54560DDAR, the DC-DC converter 204 can convert a 24V voltage into a 5V voltage, and the second power supply interface 203 adopts a conventional power supply input interface. Meanwhile, the second communication interface 202 is set as a DO interface and a DI interface, the DO interface of the PLC host 1 is connected with the DI interface of one power supply module 2, and then the DO interface of the power supply module 2 is connected with the DI interface of the next power supply module 2, and so on.

[0085] In the present embodiment, when the system is powered on, the DI interface and the DO interface of the PLC host 1 and each power supply module 2 are in low level by default. After the PLC host 1 is initialized, the subsequent power supply modules 2 are powered on one by one. The specific process is as follows. The PLC pulls up the DO interface level, the DI interface level of the first power supply module 2 changes from low to high, indicating that the PLC host 1 commands the power supply module 2 to start powering on, and when the DI interface level changes from high to low, the power supply module 2 enables the DC-DC converter 204 to work and starts powering on the subsequent connected IO module 3. After the power supply module 2 is powered on, the DO interface level is pulled up, thereby causing the DI interface level of the next power supply module 2 to change from low to high, thereby repeating the above operation to complete the power-on process in turn.

[0086] Meanwhile, in the present embodiment, each power supply module 2 is connected with two IO modules 3. In other embodiments, the connection mode of "one power supply module 2 connected with one IO module 3, two power supply modules 2 connected with two IO modules 3, and one power supply module 2 connected with three IO modules 3" can be adopted, and no further limitation is made here.

[0087] Working principle: the PLC host 1 and four power modules 2 are connected with external power supply equipment 4, the PLC host 1 and four power modules 2 are powered by external power supply equipment 4, then four power modules 2 are connected with eight IO modules 3 respectively, eight IO modules 3 are powered by four power modules 2 respectively, at the same time, the PLC host 1 is connected with four power modules 2, the start and stop of four power modules 2 are controlled by the PLC host 1, so as to meet the control requirements of different start time sequence.

[0088] The above specific embodiments further illustrate the purpose, technical scheme and beneficial effects of the utility model, and it should be understood that the above description is only a specific embodiment of the utility model, and is not used to limit the protection scope of the utility model, and any modification, equivalent replacement, improvement, etc. within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A multi-power supply system for a PLC expansion IO module, characterized in that, The system comprises a PLC host (1), a plurality of power modules (2) and a plurality of IO modules (3), the PLC host (1) and the plurality of power modules (2) are connected with an external power supply device (4) through a system power bus (5), the PLC host (1) is connected with the plurality of power modules (2) through a power control line (6) respectively, each power module (2) is connected with at least one IO module (3) through a power line (7) respectively, and the PLC host (1) is connected with the plurality of IO modules (3) through a communication line (8).

2. The multi-power supply system for PLC extension IO module according to claim 1, wherein, The number of the power modules (2) is two, the number of the IO modules (3) is four, the PLC host (1) is connected with the two power modules (2) through the power control line (6) respectively, each power module (2) is connected with at least one IO module (3) through the power line (7) respectively, and the PLC host (1) is connected with the two power modules (2) and the four IO modules (3) through the communication line (8) respectively.

3. The multi-power supply system for PLC extension IO module according to claim 1, wherein, The number of the power modules (2) is two, the number of the IO modules (3) is six, the PLC host (1) is connected with the two power modules (2) through the power control line (6) respectively, each power module (2) is connected with at least one IO module (3) through the power line (7) respectively, and the PLC host (1) is connected with the two power modules (2) and the six IO modules (3) through the communication line (8) respectively.

4. The multiple power supply system for PLC expansion IO module according to claim 1, wherein, The number of the power modules (2) is three, the number of the IO modules (3) is six, the PLC host (1) is connected with the three power modules (2) through the power control line (6) respectively, each power module (2) is connected with at least one IO module (3) through the power line (7) respectively, and the PLC host (1) is connected with the three power modules (2) and the six IO modules (3) through the communication line (8) respectively.

5. The multiple power supply system for PLC expansion IO module according to claim 1, wherein, The number of the power modules (2) is three, the number of the IO modules (3) is nine, the PLC host (1) is connected with the three power modules (2) through the power control line (6) respectively, each power module (2) is connected with at least one IO module (3) through the power line (7) respectively, and the PLC host (1) is connected with the three power modules (2) and the nine IO modules (3) through the communication line (8) respectively.

6. The multiple power supply system for PLC expansion IO module according to claim 1, wherein, The number of the power modules (2) is four, the number of the IO modules (3) is eight, the PLC host (1) is connected with the four power modules (2) through the power control line (6) respectively, each power module (2) is connected with at least one IO module (3) through the power line (7) respectively, and the PLC host (1) is connected with the four power modules (2) and the eight IO modules (3) through the communication line (8) respectively.

7. The multi-power supply system for PLC extension IO module according to any one of claims 1-6, characterized in that, The PLC host (1) comprises a first controller (101), a first communication interface (102), a first power supply interface (103) and a first internal bus interface (104), the first communication interface (102) and the first internal bus interface (104) are connected with the first controller (101), and the first power supply interface (103) is connected with the first controller (101), the first communication interface (102) and the first internal bus interface (104) respectively.

8. The multi-power supply system for PLC extension IO module according to claim 7, wherein, The plurality of power supply modules (2) each comprise a second controller (201), a second communication interface (202), a second power supply interface (203), a DC-DC converter (204) and a second internal bus interface (205), the second communication interface (202), the second internal bus interface (205) and the DC-DC converter (204) are connected with the second controller (201), and the second power supply interface (203) is connected with the second internal bus interface (205), the second controller (201), the second communication interface (202) and the DC-DC converter (204) respectively.

9. The multi-power supply system for PLC expansion IO module according to claim 8, wherein, The first communication interface (102) is connected with the plurality of second communication interfaces (202) through power supply control lines (6) respectively; the first internal bus interface (104) is connected with the plurality of second internal bus interfaces (205) through communication lines (8) respectively, each DC-DC converter (204) is connected with at least one IO module (3), and the first power supply interface (103) and the plurality of second power supply interfaces (203) are connected with an external power supply device (4).

10. The multi-power supply system for PLC extension IO module according to any one of claims 1-6, wherein, The external power supply device (4) adopts a switching power supply for power supply.

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