An embedded control system for chemical supply

Abstract

The application relates to the technical field of signal transmission and control, solves the problems of high cable cost and wiring difficulty in a chemical supply system in the prior art, and discloses an embedded control system for chemical supply, which comprises an IO mainboard and an IO subboard, the IO mainboard comprises a first processor, at least one first interface module, at least one second interface module for connecting a CDM and at least one first signal access module for connecting a first leakage sensor, the IO subboard is embeddedly installed in a VMB, the IO subboard comprises a second processor, a third interface module, a second signal access module for connecting a second leakage sensor, at least one liquid demand signal receiving end for connecting a liquid equipment and at least one preparation signal sending end for connecting a liquid equipment, and the application not only effectively guarantees the stability of signal transmission, thereby greatly reducing the required cable cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of signal transmission and control technology, in particular to an embedded control system for chemical supply. BACKGROUND

[0002] In a chemical supply system, there are usually a chemical valve distribution box VMB, a supply source CDM and a liquid using device of a customer, and there is also an END-BOX at the end of a supply main pipeline, and if the pipeline needs to be expanded, a T-BOX branch valve box is also needed, wherein a leakage sensor for detecting whether liquid leakage occurs is arranged in the VMB, the END-BOX and the T-BOX.

[0003] In the prior art, a PLC controller is usually used to realize key signal transmission and control of the chemical supply system, and the key signals include a "liquid demand" signal transmitted by the liquid using device to the PLC controller, a "leakage" signal transmitted by the PLC controller to the CDM, a "standby preparation" signal transmitted by the CDM to the PLC controller, and a valve control signal transmitted by the PLC controller to the VMB. In general, the distance between the VMB and the process body is relatively close compared with the distance between the VMB and the PLC controller. However, since the chemical supply system usually includes multiple VMBs, and each VMB usually includes multiple liquid supply pipelines, each liquid supply pipeline needs to be controlled by an independent electric control valve, and each electric control valve needs to be connected to the PLC controller by a cable to realize direct control, which results in a large amount of cables, high cable cost and difficult wiring. SUMMARY

[0004] The present application aims to overcome the problems of high cable cost and difficult wiring in the prior art chemical supply system, and provides an embedded control system for chemical supply.

[0005] The present application provides an embedded control system for chemical supply, which comprises:

[0006] an IO mainboard, the IO mainboard comprising a first processor, at least one first interface module, at least one second interface module for connecting a CDM, and at least one first signal access module for connecting a first leakage sensor, wherein the first interface module comprises a liquid demand signal input interface, a leakage signal input interface, a standby signal output interface and a first communication interface, the liquid demand signal input interface, the leakage signal input interface and the first communication interface are electrically connected to the first processor, the standby signal output module is electrically connected to the first processor through a relay, and the first interface module, the second interface module and the first signal access module are electrically connected to the first processor;

[0007] An IO daughter board embeddedly installed in the VMB, the IO daughter board comprising a second processor, a third interface module, a second signal access module for connecting a second leakage sensor, at least one liquid demand signal receiving end for connecting a liquid consuming device and at least one standby signal transmitting end for connecting a liquid consuming device, the liquid supply electrically controlled valves of the VMB being in control connection with the second processor, the third interface module comprising a first liquid demand signal output interface, a first leakage signal output interface, a first standby signal input interface and a second communication interface, the first liquid demand signal output interface being in electrical connection with the second processor through a relay, the first leakage signal output interface being in electrical connection with the second processor through a relay, the first standby signal input interface being in electrical connection with the second processor, the second communication interface being in electrical connection with the second processor, the liquid demand signal receiving end being in electrical connection with the second processor, the standby signal transmitting end being in electrical connection with the second processor through a relay, the second signal access module being in electrical connection with the second processor.

[0008] The first liquid demand signal output interface is in electrical connection with the liquid demand input interface, the first leakage signal output interface is in electrical connection with the leakage signal input interface, the first standby signal input interface is in electrical connection with the standby signal output interface, and the second communication interface is in electrical connection with the first communication interface.

[0009] In some possible implementation manners, the IO main board further comprises a first power supply interface, and the first processor and the first signal access module are in electrical connection with the first power supply interface.

[0010] In some possible implementation manners, the first signal access module comprises a first positive terminal, a first negative terminal, a first signal terminal and a first indicator lamp for indicating whether leakage occurs, the first positive terminal and the first negative terminal are in electrical connection with the positive and negative terminal posts of the first power supply interface respectively, and the first signal terminal is in electrical connection with the first processor.

[0011] In some possible implementation manners, the second interface module comprises a second liquid demand signal output interface, a second leakage signal output interface, a second standby signal input interface and a third communication interface, the second liquid demand signal output interface is in electrical connection with the first processor through a relay, the second leakage signal output interface is in electrical connection with the first processor through a relay, and the second standby signal input interface and the third communication interface are in electrical connection with the first processor.

[0012] In some possible implementation manners, the IO daughter board further comprises a second power supply interface, and the second processor and the second signal access module are in electrical connection with the second power supply interface.

[0013] In some possible implementation manners, the second signal access module comprises a second positive terminal, a second negative terminal, a second signal terminal and a second indicator lamp for indicating whether leakage occurs, the second positive terminal and the second negative terminal are electrically connected with positive and negative terminals of the second power supply interface respectively, and the second signal terminal is electrically connected with the second processor.

[0014] In some possible implementation manners, the first communication interface, the second communication interface and the third communication interface are all 485 communication interfaces.

[0015] In some possible implementation manners, the first leakage sensor access module has different dials respectively, the second leakage sensor access module has different dials respectively, and the IO daughterboard has different dials respectively, and the dials are used for identifying signals during transmission.

[0016] In some possible implementation manners, the liquid supply electrically-controlled valve of the VMB is a pneumatic valve controlled by a solenoid valve, one end of a solenoid coil of the solenoid valve is electrically connected with the second processor, and the other end of the solenoid coil of the solenoid valve is electrically connected with a positive terminal of the second power supply interface.

[0017] In some possible implementation manners, the first leakage sensor is used for detecting whether the T-BOX and the END-BOX leak liquid, and the second leakage sensor is used for detecting whether the VMB leaks liquid.

[0018] The application has the following beneficial effects: the application can embed the IO daughterboard into the VMB, embed the IO mainboard into the IO disc, and adopt dry contacts and double signals for communication, so that the stability of signal transmission is effectively ensured, and signal transmission between the VMB and the IO mainboard can be completed through an eight-core cable, so that the cable cost required for implementation and the engineering quantity of construction can be greatly reduced. BRIEF DESCRIPTION OF DRAWINGS

[0019] The drawings constituting a part of the application are used to provide further understanding of the application, the illustrative embodiments of the application and the description thereof are used to explain the application, and do not constitute improper limitation on the application.

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the application, the drawings needed to be used in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of these drawings.

[0021] Figure 1 is a structural schematic diagram of the embedded control system for chemical supply in the embodiments of the application;

[0022] Figure 2 is a structural schematic diagram of an IO mainboard in an embedded control system for chemical supply according to an embodiment of the present application;

[0023] Figure 3 is a structural schematic diagram of an IO subboard in an embedded control system for chemical supply according to an embodiment of the present application;

[0024] Figure 4 is a supply system schematic diagram in which an embedded control system for chemical supply according to an embodiment of the present application is embedded.

[0025] Reference signs:

[0026] 100, IO mainboard; 101, first processor; 102, first interface module; 1021, liquid-to-be-supplied signal input interface; 1022, leakage signal input interface; 1023, standby signal output interface; 1024, first communication interface; 103, second interface module; 1031, second liquid-to-be-supplied signal output interface; 1032, second leakage signal output interface; 1033, second standby signal input interface; 1034, third communication interface; 104, first signal access module; 1041, first positive terminal; 1042, first negative terminal; 1043, first indicator light; 1044, first signal terminal; 105, first power supply interface; 200, IO subboard; 201, second processor; 202, third interface module; 2021, first liquid-to-be-supplied signal output interface; 2022, first leakage signal output interface; 2023, first standby signal input interface; 2024, second communication interface; 203, second signal access module; 2031, second positive terminal; 2032, second negative terminal; 2033, second signal terminal; 2034, second indicator light; 204, liquid-to-be-supplied signal receiving end; 2041, third indicator light; 205, preparation signal sending end; 2051, fourth indicator light; 206, second power supply interface; 300, VMB; 400, T-BOX; 500, END-BOX; 600, relay; 700, CDM; 800, liquid-using equipment; 900, IO disk. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0028] EMBODIMENT

[0029] AsFigure 1 As shown, the embedded control system for chemical supply according to the embodiments of the application comprises an IO mainboard 100 and an IO daughterboard 200.

[0030] In the embodiment, the first communication interface 1024, the second communication interface 2024 and the third communication interface 1034 are all 485 communication interfaces, the first leakage sensor access module has different dials, the second leakage sensor access module has different dials, and the IO daughterboard 200 has different dials, which are used for identification of signals during transmission. The liquid supply electric control valve of the VMB 300 is a pneumatic valve controlled by a solenoid valve. One end of the solenoid coil of the solenoid valve is electrically connected to the second processor 201, and the other end of the solenoid coil is electrically connected to the positive electrode of the second power supply interface 206. The first leakage sensor is used to detect whether the T-BOX 400 and the END-BOX 500 leak liquid, and the second leakage sensor is used to detect whether the VMB 300 leaks liquid. The T-BOX 400 is a branch valve box / extension valve box. The T-BOX 400 can divide the inlet pipeline into two or more outlet pipelines to realize the distribution and allocation of fluid. The T-BOX 400 is internally provided with a leakage sensor and a branch manual valve. Each branch is used to be connected to the VMB 300, the T-BOX 400 and the END-BOX 500. The END-BOX 500 is a supply main pipeline end connected to the VMB 300. The END-BOX 500 is internally provided with a leakage sensor and a branch manual valve. The supply main pipeline end is connected to the VMB 300 and is provided with an extension interface.

[0031] As Figure 2As shown, IO mainboard 100 is used to collect the REQUEST signals of each VMB 300, give READY signals to each VMB 300; collect the leakage signals of VMB 300, T-BOX 400, END-BOX 500; collect the READY signals of CDM 700, convey the REQUEST signals to CDM 700, convey the leakage signals of VMB 300, T-BOX 400, END-BOX 500 (FT-BOX 400) to CDM 700, wherein the signal types of the REQUEST signals and the READY signals are dry contacts, the REQUEST signals are the liquid demand signals of VMB 300, and the READY signals are the standby signals of VMB 300 to the liquid equipment 800, when the corresponding VMB 300 branch is in a supplyable state, the corresponding chemical READY dry contact is closed. The mainboard includes a first processor 101, at least one first interface module 102, at least one second interface module 103 for connecting CDM 700, and at least one first signal access module 104 for connecting the first leakage sensor, wherein the first interface module 102 includes a liquid demand signal input interface 1021, a leakage signal input interface 1022, a standby signal output interface 1023, and a first communication interface 1024, the liquid demand signal input interface 1021, the leakage signal input interface 1022, and the first communication interface 1024 are electrically connected with the first processor 101, the standby signal output module is electrically connected with the first processor 101 through a relay 600, and the first interface module 102, the second interface module 103, and the first signal access module 104 are electrically connected with the first processor 101.

[0032] In order to provide power supply for IO daughterboard 200, IO mainboard 100 further includes a first power supply interface 105, the first processor 101 and the first signal access module 104 are electrically connected with the first power supply interface 105, and an external power supply is connected through the first power supply interface 105, so as to provide power supply for the first processor 101, the first signal access module 104, and other electronic devices connected with the first processor 101.

[0033] In order to connect the first leakage sensor, the first signal access module 104 comprises a first positive terminal 1041, a first negative terminal 1042, a first signal terminal 1044 and a first indicator lamp 1043 for indicating whether there is leakage, wherein the first signal access module 104 further comprises: a normally open / normally closed dial code, an NPN / PNP dial code, the first positive terminal 1041 and the first negative terminal 1042 are respectively electrically connected with the positive and negative terminal posts of the first power supply interface 105, and the first signal terminal 1044 is electrically connected with the first processor 101.

[0034] In order to connect the CDM 700, wherein the CDM 700 is a source of supplied chemicals, but the chemicals are in barrels or cans, and the chemicals can be supplied to the VMB 300 by a pump valve in the CDM 700, the second interface module 103 comprises a second liquid required signal output interface 1031, a second leakage signal output interface 1032, a second standby signal input interface 1033 and a third communication interface 1034, wherein the second liquid required signal output interface 1031 is electrically connected with the first processor 101 through the relay 600, the second leakage signal output interface 1032 is electrically connected with the first processor 101 through the relay 600, and the second standby signal input interface 1033 and the third communication interface 1034 are electrically connected with the first processor 101, so that the IO mainboard 100 can obtain whether the CDM has the condition of supplying liquid from the CDM, and the IO mainboard 100 can forward the liquid required signal, the leakage signal and the 485 communication signal of the liquid using equipment 800 to the CDM 700, so as to realize the communication between the IO mainboard 100 and the CDM 700, wherein the liquid using equipment 800 refers to the equipment using chemicals for process, the final use equipment of chemical medium, the VMB 300 refers to a device for dividing a pipeline from the CDM 700 into multiple pipelines, which internally is provided with a second leakage sensor, a branch pneumatic valve (optional) and a branch manual valve, each branch is used to connect to the liquid using equipment 800; collects the REQUEST signal (i.e. liquid required signal) of each liquid using equipment 800 and gives the READY signal (i.e. preparation signal) of each liquid using equipment 800; and can control the opening or closing of the VMB 300 valve according to the system condition.

[0035] It should be noted that the IO mainboard 100 is installed in the IO disc 900, and the same number of IO mainboards 100 are configured according to the type of chemicals in the IO disc 900, and the interfaces of the IO mainboard 100 will be described below:

[0036] 1. The first power supply interface 105 is connected with a DC 24V power supply;

[0037] 2. In this embodiment, 15 sets of first signal access modules 104 are set. The number of first signal access modules 104 can be customized according to requirements. The first signal access modules 104 are connected to the power supply and signal of the first leakage sensor in T-BOX400, FT-BOX400, and U-BOX respectively. If it is a two-wire leakage sensor, it is connected to the first positive terminal 1041 or the first negative terminal 1042 and the first signal terminal 1044. The first leakage sensor DIP switch is set according to normally open / normally closed and NPN / PNP to set the leakage sensor type. After leakage is triggered, the first indicator light 1043 works. When any one of the 15 sets leaks, the leakage output terminal closes and the corresponding first indicator light 1043 lights up.

[0038] 3. In this embodiment, 15 sets of first interface modules 102 are set. The number of first interface modules 102 can be customized according to requirements. They are connected to the IO daughter boards 200 installed on each VMB300. The number of IO daughter boards 200 is configured to be the same as the number of VMB300 for a certain chemical in this IO disk 900. The first interface module 102 receives and sends two sets of signals to the IO daughter board 200: dry contact signals and communication signals. The communication signals are sent to the IO daughter board 200 as standby status signals and receive IO daughter board 200 request signals, leakage sensor signals, and Stick Valve signals. Whether a leakage signal is received from a dry contact or through communication, the leakage output will be closed and the signal will be transmitted to the CDM700.

[0039] 4. Second liquid signal output interface 1031: When the IO motherboard 100 receives a liquid output signal from any IO daughterboard 200, this terminal will be closed. Or, when the standby signal is 1, this terminal will be closed when it receives a Stick Request signal from any IO daughterboard 200 (that is, the first processor 101 controls the relay 600 connected to the second liquid signal output interface 1031 to close).

[0040] 5. Second Leakage Signal Output Interface 1032: This terminal closes when a leakage output signal is received from any IO sub-board 200, or when a communication signal sensor leakage signal is received from any IO sub-board 200, or when any T-BOX400, FT-BOX400, or U-BOX is in a leakage state (i.e., the first processor 101 controls the relay 600 connected to the second leakage signal output interface 1032 to close).

[0041] 6. Second standby signal input interface 1033: Connects to the standby signal of CDM700. If this terminal is closed on the CDM700 side, it indicates that the standby signal of CDM700 has been received.

[0042] 7. The third communication interface 1034 (a 485 communication interface): connected to the communication signal of the CDM700, sends the Request state of each IO daughter board 200 of the CDM700 and the Stick valve state of the VMB300 (the Stick valve state is used to indicate the opening and closing state of the liquid supply electric control valve in the VMB300); receives the Ready signal of the CDM700.

[0043] As shown in Figure 3 the IO daughter board 200, the IO daughter board 200 is embeddedly installed in the VMB300, the IO daughter board 200 includes a second processor 201, a third interface module 202, a second signal access module 203 for connecting the second leakage sensor, at least one liquid demand signal receiving end 204 for connecting the liquid using equipment 800 and at least one standby signal sending end 205 for connecting the liquid using equipment 800, the liquid supply electric control valve of the VMB300 is controlled and connected with the second processor 201, the third interface module 202 includes a first liquid demand signal output interface 2021, a first leakage signal output interface 2022, a first standby signal input interface 2023 and a second communication interface 2024, the first liquid demand signal output interface 2021 is electrically connected with the second processor 201 through the relay 600, the first leakage signal output interface 2022 is electrically connected with the second processor 201 through the relay 600, the first standby signal input interface 2023 is electrically connected with the second processor 201, the second communication interface 2024 is electrically connected with the second processor 201, the liquid demand signal receiving end 204 is electrically connected with the second processor 201, the standby signal sending end 205 is electrically connected with the second processor 201 through the relay 600, the second signal access module 203 is electrically connected with the second processor 201, the standby signal sending end 205 is used to connect the liquid using equipment 800, and the standby signal sending end 205 is provided with a fourth indicating lamp 2051, when the CDM700 is in the Ready state, the fourth indicating lamp 2051 is bright or bright green to indicate that the CDM700 is in the Ready state, and the standby signal sending end 205 is used to send the Ready signal (i.e. standby signal) of the CDM700 to the liquid using equipment 800.

[0044] In order to provide power supply for the IO daughter board 200, the IO daughter board 200 further includes a second power supply interface 206, the second processor 201 and the second signal access module 203 are electrically connected with the second power supply interface 206, and an external power supply is connected through the second power supply interface 206, so as to provide power supply for the second processor 201, the second signal access module 203 and other electronic devices connected with the second processor 201.

[0045] In order to connect the second leakage sensor, the second signal access module 203 comprises a second positive terminal 2031, a second negative terminal 2032, a second signal terminal 2033 and a second indicator lamp 2034 for indicating whether there is leakage, and further comprises: a normally open / normally closed dial code, an NPN / PNP dial code, the second positive terminal 2031 and the second negative terminal 2032 are respectively electrically connected with the positive and negative terminals of the second power supply interface 206, and the second signal terminal 2033 is electrically connected with the second processor 201.

[0046] It should be noted that the IO daughterboard 200 is installed in the VMB 300, and the second power supply interface 206 is connected with a DC 24V power supply. The following will describe each interface of the IO daughterboard 200 respectively.

[0047] 1. In the embodiment, eight liquid signal receiving ends 204 are provided, and the number of the liquid signal receiving ends 204 can be customized according to requirements. Each of the liquid signal receiving ends 204 is provided with a corresponding third indicator lamp 2041. If the liquid signal receiving end 204 is closed, the corresponding third indicator lamp 2041 is bright, and the signal of the first standby signal input interface 2023 is 1 or the standby signal sent from the third communication interface 1034 (i.e. the 485 communication interface) is 1, and the VMB 300 has no leakage, then the Stick1Valve outputs low level, and the first liquid signal output interface 2021.

[0048] 2. The first standby signal input interface 2023: if the signal of the first standby signal input interface 2023 is 1, then the first liquid signal output interface 2021 is in a closed state, and the corresponding third indicator lamp 2041 is bright.

[0049] 3. The second positive terminal 2031 and the second negative terminal 2032 are respectively connected with the power supply of the second leakage sensor in the VMB 300, and the second signal terminal 2033 is connected with the signal output of the second leakage sensor in the VMB 300. If the second leakage sensor in the VMB 300 is a two-wire system, then the second leakage sensor is connected with the second negative terminal 2032 and the second signal terminal 2033. The leakage sensor dial code sets the type of the leakage sensor according to the normally open / normally closed and NPN / PNP, and the corresponding second indicator lamp 2034 works after triggering the leakage, and the first leakage signal output interface 2022 is closed (i.e. the second processor 201 controls the relay 600 connected with the first leakage signal output interface 2022 to be closed).

[0050] As Figure 1As shown, the first liquid demand signal output interface 2021 is electrically connected with the liquid demand signal input interface, the first leakage signal output interface 2022 is electrically connected with the leakage signal input interface 1022, the first standby signal input interface 2023 is electrically connected with the standby signal output interface 1023, and the second communication interface 2024 is electrically connected with the first communication interface 1024.

[0051] As shown, the supply process of the control system in the embodiment is as follows: Figure 4

[0052] 1. When the CDM 700 is in the Ready state, the CDM 700 sends a Ready signal to the IO mainboard 100 in the IO disk 900;

[0053] 2. When the T-BOX 400 and the END-BOX 500 in the pipeline have no leakage and the IO disk 900 receives the Ready signal from the CDM 700, the IO disk 900 sends a Ready signal to the VMB 300;

[0054] 3. When the VMB 300 has no leakage signal and receives the Ready signal from the IO disk 900, the VMB 300 sends a Ready signal to the liquid using equipment 800, indicating that the CDM 700 system can supply liquid to the liquid using equipment 800;

[0055] 4. When the liquid using equipment 800 has a liquid demand, the liquid using equipment 800 sends a Request signal to the VMB 300;

[0056] 5. The VMB 300 receives the Request signal from any of the liquid using equipment 800, opens the VMB 300 branch valve corresponding to the liquid using equipment 800, and sends a Request signal to the IO disk 900;

[0057] 6. The IO disk 900 receives the Request signal from any of the VMB 300, and sends a liquid demand signal to the CDM 700 disk;

[0058] 7. The CDM 700 receives the Request signal to supply liquid externally, and the chemical liquid is transported to the liquid using equipment 800 through the T-BOX 400, the END-BOX 500, and the VMB 300.

[0059] In the embodiment, by embedding the IO daughterboard 200 into the VMB 300, embedding the IO mainboard 100 into the IO disk 900, and adopting dry contacts and double signals for communication, the stability of signal transmission is effectively ensured, and the signal transmission between the VMB 300 and the IO mainboard 100 can be completed through one eight-core cable, so that the cable cost required for implementation and the engineering quantity of construction can be greatly reduced. ​

[0060] The above merely provides the preferred embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art, according to the technical solution and the improvement concept of the present application, can make equivalent replacement or change within the technical scope disclosed by the present application, and all should be covered in the protection scope of the present application.

Claims

1. An embedded control system for chemical supply, characterized in that, The embedded control system comprises: an IO mainboard, which comprises a first processor, at least one first interface module, at least one second interface module for connecting a supply source CDM, and at least one first signal access module for connecting a first leakage sensor, wherein the first interface module comprises a liquid-to-be-supplied signal input interface, a leakage signal input interface, a standby signal output interface, and a first communication interface, the liquid-to-be-supplied signal input interface, the leakage signal input interface, and the first communication interface are electrically connected with the first processor, the standby signal output module is electrically connected with the first processor through a relay, and the first interface module, the second interface module, and the first signal access module are electrically connected with the first processor; an IO daughterboard, which is embedded in a chemical valve distribution box VMB, and comprises a second processor, a third interface module, a second signal access module for connecting a second leakage sensor, at least one liquid-to-be-supplied signal receiving end for connecting a liquid-using device, and at least one preparation signal sending end for connecting the liquid-using device, the liquid-supply electrically controlled valves of the chemical valve distribution box VMB are controlled to be connected with the second processor, the third interface module comprises a first liquid-to-be-supplied signal output interface, a first leakage signal output interface, a first standby signal input interface, and a second communication interface, the first liquid-to-be-supplied signal output interface is electrically connected with the second processor through a relay, the first leakage signal output interface is electrically connected with the second processor through a relay, the first standby signal input interface is electrically connected with the second processor, the second communication interface is electrically connected with the second processor, the liquid-to-be-supplied signal receiving end is electrically connected with the second processor, the preparation signal sending end is electrically connected with the second processor through a relay, and the second signal access module is electrically connected with the second processor; wherein the first liquid-to-be-supplied signal output interface is electrically connected with the liquid-to-be-supplied input interface, the first leakage signal output interface is electrically connected with the leakage signal input interface, the first standby signal input interface is electrically connected with the standby signal output interface, and the second communication interface is electrically connected with the first communication interface; the working process of the embedded control system comprises: (1) when the supply source CDM is in a Ready state, the supply source CDM sends a Ready signal to the IO mainboard in the IO disk; (2) when the branch valve box T-BOX and the terminal box END-BOX in the pipeline have no leakage and the IO disk receives the Ready state transmitted by the supply source CDM, the IO disk sends a Ready signal to the chemical valve distribution box VMB; (3) when the chemical valve distribution box VMB has no leakage signal and receives the Ready state transmitted by the IO disk, the chemical valve distribution box VMB sends a Ready signal to the liquid-using device, indicating that the supply source CDM can supply liquid to the liquid-using device; (4) when the liquid-using device has a liquid-to-be-supplied demand, the liquid-using device sends a Request signal to the chemical valve distribution box VMB. (5) The VMB receives the request signal from any liquid using equipment, opens the corresponding VMB branch valve of the liquid using equipment, and sends a request signal to the IO disk at the same time; (6) The IO disk receives the request signal from any VMB, and sends a liquid demand signal to the CDM; (7) The CDM receives the request signal and supplies liquid externally, and the chemical liquid is transported to the liquid using equipment through the branch valve box T-BOX, the terminal box END-BOX and the VMB.

2. The embedded control system for chemical supply of claim 1, wherein, The IO mainboard further comprises a first power supply interface, and the first processor and the first signal access module are electrically connected with the first power supply interface.

3. The embedded control system for chemical supply of claim 2, wherein, The first signal access module comprises a first positive terminal, a first negative terminal, a first signal terminal and a first indicator lamp for indicating whether there is leakage, the first positive terminal and the first negative terminal are electrically connected with the positive and negative terminals of the first power supply interface respectively, and the first signal terminal is electrically connected with the first processor.

4. The embedded control system for chemical supply of claim 1, wherein, The second interface module comprises a second liquid demand signal output interface, a second leakage signal output interface, a second standby signal input interface and a third communication interface, wherein the second liquid demand signal output interface is electrically connected with the first processor through a relay, the second leakage signal output interface is electrically connected with the first processor through a relay, and the second standby signal input interface and the third communication interface are electrically connected with the first processor.

5. The embedded control system for chemical supply of claim 1, wherein, The IO subboard further comprises a second power supply interface, and the second processor and the second signal access module are electrically connected with the second power supply interface.

6. The embedded control system for chemical supply of claim 5, wherein, The second signal access module comprises a second positive terminal, a second negative terminal, a second signal terminal and a second indicator lamp for indicating whether there is leakage, the second positive terminal and the second negative terminal are electrically connected with the positive and negative terminals of the second power supply interface respectively, and the second signal terminal is electrically connected with the second processor.

7. The embedded control system for chemical supply of claim 4, wherein, The first communication interface, the second communication interface and the third communication interface are all 485 communication interfaces.

8. The embedded control system for chemical supply of claim 1, wherein, The first leakage sensor access module has different dials respectively, the second leakage sensor access module has different dials respectively, and the IO subboard has different dials respectively, and the dials are used for identifying signals during transmission.

9. The embedded control system for chemical supply of claim 5, wherein, The liquid supply electric control valve of the VMB is a pneumatic valve controlled by a solenoid valve, one end of the solenoid coil of the solenoid valve is electrically connected with the second processor, and the other end of the solenoid coil of the solenoid valve is electrically connected with the positive terminal of the second power supply interface.

10. The embedded control system for chemical supply of claim 1, wherein, The first leakage sensor is used for detecting whether the branch valve box T-BOX and the terminal box END-BOX leak liquid, and the second leakage sensor is used for detecting whether the VMB leaks liquid.

Images