Compatible interface modules

Abstract

The embodiment of the present invention relates to the field of electronic technology, and discloses a compatible interface module, including: a state detection branch and a signal output branch. The state detection branch is used to receive a trigger signal of a sensor, and emits an optical signal when the trigger signal of the sensor is received; the signal output branch is used to receive the optical signal, and the signal output branch outputs a first level signal when the optical signal is received, and outputs a second level signal when the optical signal is not received. There is no need to select a matching interface according to the sensor type, so that different output signals can be obtained directly according to the output state of the sensor, which is conducive to improving the flexibility of signal recognition and signal processing efficiency.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of electronic technology, and in particular to a compatible interface module. Background Art

[0002] Sensors are widely used in industrial control, logistics and other fields. Sensors have analog and digital output modes. Digital output sensors include NPN and PNP. Although both NPN and PNP sensors are switch sensors, their internal circuit compositions are different, so the circuit outputs are also different. Usually, special interfaces are required to connect with different sensors.

[0003] However, the inventors have found that there are at least the following problems in the prior art: the output state of the sensor varies with the type of sensor, so that in actual use, a matching interface must be selected according to the sensor type or a matching sensor must be selected according to the interface type. Summary of the invention

[0004] The purpose of the embodiments of the present invention is to provide a compatible interface module, which does not require selecting a matching interface according to the sensor type, and can directly obtain different output signals according to the output state of the sensor, which is beneficial to improving the flexibility of signal recognition and signal processing efficiency.

[0005] To solve the above technical problems, an embodiment of the present invention provides a compatible interface module, including: a state detection branch and a signal output branch; the state detection branch is used to receive a trigger signal of a sensor and emit an optical signal when the trigger signal of the sensor is received; the signal output branch is used to receive an optical signal, and the signal output branch outputs a first level signal when the optical signal is received and outputs a second level signal when the optical signal is not received.

[0006] Compared with the prior art, the embodiments of the present invention provide a compatible interface module, including: a state detection branch and a signal output branch; the state detection branch is used to receive a trigger signal of a sensor and emit a light signal when the trigger signal of the sensor is received; the signal output branch is used to receive the light signal, the signal output branch outputs a first level signal when the light signal is received, and outputs a second level signal when the light signal is not received. Through this circuit design, the first level signal can be directly output according to the trigger signal of the sensor, and the second level signal can be output when the sensor has no trigger signal. There is no need to set an interface matching different sensor types at the front end of the compatible interface module, and different output signals can be obtained directly according to the output state of the sensor, which is conducive to improving the flexibility of signal recognition and signal processing efficiency.

[0007] In addition, the status detection branch includes: a first resistor, a second resistor, two light-emitting diodes, a first node for receiving a trigger signal of the sensor, a second node and a first external power input terminal; the two light-emitting diodes are connected in reverse parallel between the first node and the second node; one end of the first resistor is connected to the second node and the other end is grounded; one end of the second resistor is connected to the second node and the other end is connected to the first external power input terminal.

[0008] In addition, it also includes: an output port, which is connected to the signal output branch and is used to transmit the level signal output by the signal output branch to the next unit.

[0009] In addition, the signal output branch includes: a photoelectric receiver, a third resistor and a second external power input terminal; one end of the photoelectric receiver is connected to the output port and connected to the second external power input terminal through the third resistor; the other end of the photoelectric receiver is grounded.

[0010] In addition, the signal output branch includes: a photoelectric receiver, a third resistor and a second external power input terminal; one end of the photoelectric receiver is connected to the second external power input terminal; the other end of the photoelectric receiver is connected to the output port and grounded through the third resistor.

[0011] In addition, it also includes: an input port, which is connected to the state detection branch and is used to receive a trigger signal from the sensor and transmit the trigger signal to the state detection branch.

[0012] In addition, the invention also includes: a port protector for suppressing transient pulses; and the input port is grounded via the port protector.

[0013] In addition, it also includes: multiple input ports and a port switch; the multiple input ports are connected to the input end of the port switch, and the output end of the port switch is connected to the state detection branch; each input port is used to receive a trigger signal from a sensor; the port switch is used to selectively transmit the trigger signal of the sensor received by any input port to the state detection branch.

[0014] In addition, it also includes: a plurality of port protectors, each port protector corresponds to an input port, and each input port is grounded through the corresponding port protector.

[0015] In addition, the status detection branch and the signal output branch are electrically isolated. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] One or more embodiments are exemplarily described by pictures in the accompanying drawings, which do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and the figures in the drawings do not constitute proportional limitations unless otherwise stated.

[0017] Figure 1 is a schematic structural diagram of a compatible interface module according to a first embodiment of the present invention;

[0018] Figure 2 is a circuit diagram of a compatible interface module according to a first embodiment of the present invention;

[0019] Figure 3 is a replaceable circuit diagram of a compatible interface module according to a first embodiment of the present invention;

[0020] Figure 4 is a schematic structural diagram of a compatible interface module according to a second embodiment of the present invention;

[0021] Figure 5 is a circuit diagram of a compatible interface module according to a third embodiment of the present invention;

[0022] Figure 6 is a replaceable circuit diagram of a compatible interface module according to the third embodiment of the present invention. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the following will be described in detail with reference to the accompanying drawings. However, it will be appreciated by those skilled in the art that in the various embodiments of the present invention, many technical details are provided in order to enable the reader to better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical scheme claimed in the present application can be implemented.

[0024] There are two types of sensor outputs: analog and digital. Digital sensors are divided into NPN and PNP types. The output states of these two types of sensors are very different. Take the NO digital sensor as an example. When the NPN-NO sensor is not triggered, the sensor output port is in a suspended state. When it is triggered, the sensor output port is in a low level state. When the PNP-NO sensor is not triggered, the sensor output port is in a suspended state. When it is triggered, the sensor output port is in a high level state. Due to the different output states of these two sensors, in actual use, it is necessary to select a matching interface according to the sensor type or select a matching sensor according to the interface type. This brings a lot of inconvenience to actual use, and the interface module has poor adaptability and low efficiency.

[0025] In view of this, the first embodiment of the present invention provides a compatible interface module, and its structural diagram is shown as follows: Figure 1As shown, it includes: a state detection branch 11 and a signal output branch 12, the state detection branch 11 is used to receive the trigger signal of the sensor and emit an optical signal when the trigger signal of the sensor is received; the signal output branch 12 is used to receive the optical signal, and the signal output branch 12 outputs a first level signal when the optical signal is received and outputs a second level signal when the optical signal is not received.

[0026] In this embodiment, when the state detection branch 11 receives the trigger signal of the digital sensor, it can send an optical signal to the signal output branch 12. The signal output branch 12 sends a first level signal when receiving the optical signal, and sends a second level signal when not receiving the optical signal. Through this circuit design, the first level signal can be directly output according to the trigger signal of the sensor, and the second level signal can be output when the sensor has no trigger signal. There is no need to set an interface matching different sensor types at the front end of the compatible interface module. Different output signals can be obtained directly according to the output state of the sensor, which is conducive to improving the flexibility of signal recognition and signal processing efficiency.

[0027] Furthermore, in this embodiment, the compatible interface module further includes: an output port 13, which is connected to the signal output branch 12 and is used to transmit the level signal output by the signal output branch 12 to the next unit.

[0028] It should be noted that in this embodiment, the first level signal output by the signal output branch 12 can be a high level or a low level, and correspondingly, the second level signal can be a low level or a high level.

[0029] If the first level signal sent by the signal output branch 12 when receiving the optical signal is low level, and the second level signal sent when not receiving the optical signal is high level, then the circuit diagram of the compatible interface module in this embodiment is as follows: Figure 2 As shown:

[0030] The state detection branch 11 includes: a first resistor R1, a second resistor R2, two light-emitting diodes D, a first node 1 for receiving a trigger signal of a sensor, a second node 2, and a first external power input terminal V1; the two light-emitting diodes D are connected in reverse parallel between the first node 1 and the second node 2; one end of the first resistor R1 is connected to the second node 2, and the other end is grounded; one end of the second resistor R2 is connected to the second node 2, and the other end is connected to the first external power input terminal V1.

[0031] The signal output branch 12 includes: a photoelectric receiver, a third resistor R3 and a second external power input terminal V2; one end 4 of the photoelectric receiver is connected to the output port 13 and is connected to the second external power input terminal V2 through the third resistor R3; the other end 3 of the photoelectric receiver is grounded.

[0032] It should be emphasized that the two anti-parallel light emitting diodes D and the photoelectric receiver together constitute the photoelectric isolation device U2. In this embodiment, it is divided into two branches only for the convenience of describing the functions of each component.

[0033] Combine the following Figure 2 The circuit diagram of the compatible interface module and the signal flow direction inside the circuit during operation are shown in the figure. Figure 2 The working principle of the compatible interface module is described in detail:

[0034] Take the NPN digital sensor as an example:

[0035] Since the NPN digital sensor outputs a low level when triggered, the first node 1 receives the low level output by the NPN digital sensor, and the first external power input terminal V1, the second resistor R2, the first light-emitting diode D1 and the first node 1 form a loop, and the current flows from the first external power input terminal V1 to the first node 1. At this time, the first light-emitting diode D1 is turned on and emits a light signal, and the photoelectric receiver receives the light signal and turns on, and at this time, the output port 13 is grounded and outputs a low level.

[0036] Since the NPN digital sensor does not output a level signal when it is not triggered, the first node 1 cannot receive a level signal, a loop cannot be formed inside the state detection branch 11, and both light emitting diodes D are not turned on. At this time, the photoelectric receiver cannot receive a light signal and is in a cut-off state, and the output port 13 is connected to the second external power input terminal V2 through the third resistor R3, and the output port 13 outputs a high level.

[0037] As mentioned above, when the first node 1 receives a trigger signal of an NPN digital sensor, the relationship between the sensor state, whether the two light emitting diodes D of the photoelectric isolation device U2 generate light signals, and the level state of the output port 13 is shown in Table 1 below:

[0038] Table 1:

[0039] NPN sensor status U2 generates optical signal Output port level Not triggered (floating) none high Triggered (low level, power ground) have Low

[0040] Take the PNP digital sensor as an example:

[0041] Since the PNP digital sensor outputs a high level when triggered, the first node 1 receives the high level output by the PNP digital sensor. At this time, the first node 1, the second light emitting diode D2, the first resistor R1 and the ground form a loop, and the current flows from the first node 1 to the ground. At this time, the second light emitting diode D2 is turned on and emits a light signal, and the photoelectric receiver receives the light signal and turns on. At this time, the output port 13 is grounded and outputs a low level.

[0042] Since the PNP digital sensor does not output a level signal when it is not triggered, the first node 1 cannot receive a level signal, a loop cannot be formed inside the state detection branch 11, and both light emitting diodes D are not turned on. At this time, the photoelectric receiver cannot receive a light signal and is in a cut-off state, and the output port 13 is connected to the second external power input terminal V2 through the third resistor R3, and the output port 13 outputs a high level.

[0043] In the above, when the first node 1 receives a trigger signal of a PNP digital sensor, the relationship between the sensor state, whether the two light emitting diodes D of the photoelectric isolation device U2 generate light signals, and the level state of the output port 13 is shown in the following 2:

[0044] Table 2:

[0045] PNP sensor status U2 generates optical signal Output port level Not triggered (floating) none high Triggered (high level) have Low

[0046] In summary, it can be seen that the compatible interface module's recognition of the state of the digital sensor has nothing to do with its type. Whether it is an NPN digital sensor or a PNP digital sensor, as long as it is connected to the compatible interface module, the relationship between the output port 13 level and the sensor state is as shown in Table 3 below:

[0047] Table 3:

[0048] Sensor Status Output port level Not triggered high Triggered Low

[0049] If the first level signal sent by the signal output branch 12 when receiving the optical signal is high level, and the second level signal sent when not receiving the optical signal is low level, then the circuit diagram of the compatible interface module in this embodiment is as follows: Figure 3 As shown:

[0050] Figure 3 and Figure 2 The circuit structure of the state detection branch 11 is the same, and the circuit structure of the signal output branch 12 is different. Figure 3 The middle signal output branch 11 includes: a photoelectric receiver, a third resistor R3 and a second external power input terminal V2; one end 4 of the photoelectric receiver is connected to the second external power input terminal V2; the other end 3 of the photoelectric receiver is connected to the output port 13 and grounded through the third resistor R3.

[0051] Because in Figure 2 When explaining the working principle of the compatible interface module, it has been clearly stated that whether it is an NPN digital sensor or a PNP digital sensor, the state detection branch 11 can receive the trigger signal and send an optical signal to the signal output branch 12 when the sensor is triggered. Figure 3 and Figure 2 The circuit structure of the state detection branch 11 is the same, therefore, Figure 3 The state detection branch 11 in Figure 2 The middle state detection branch 11 has the same function, and can receive a trigger signal and send a light signal to the signal output branch 12 when the sensor is triggered.

[0052] Figure 3 When the state detection branch 11 receives the trigger signal of the sensor and sends out a light signal, the photoelectric receiver receives the light signal and turns on. At this time, the output port 13 is connected to the second external power input terminal V2 and outputs a high level. When the state detection branch 11 does not receive the trigger signal of the sensor, the photoelectric receiver does not receive the light signal and is in a cut-off state. At this time, the output port 13 is grounded through the third resistor R3 and outputs a low level.

[0053] In summary, Figure 3 The compatible interface module in the identification of the digital sensor status is independent of its type. Whether it is an NPN digital sensor or a PNP digital sensor, as long as it is connected to the compatible interface module, the relationship between the output port 13 level and the sensor status is as shown in Table 4 below:

[0054] Table 4:

[0055] Sensor Status Output port level Not triggered Low Triggered high

[0056] It should be emphasized that Figure 2 Same as in Figure 3 The two anti-parallel light emitting diodes D and the photoelectric receiver together constitute the photoelectric isolation device U2. In this embodiment, it is divided into two branches only for the convenience of describing the functions of each component.

[0057] In this embodiment Figure 2 and Figure 3 Two implementation methods of the circuit structure of the compatible interface module are given. No matter which implementation method is used, whether it is an NPN digital sensor or a PNP digital sensor, as long as it is connected to the compatible interface module, different output signals can be obtained according to the output state of the sensor. There is no need to set interfaces matching different sensor types at the front end of the compatible interface module, which is conducive to improving the flexibility of signal recognition and signal processing efficiency.

[0058] It should be noted that in the embodiment of the present invention, the state detection branch 11 and the signal output branch 12 are electrically isolated, the grounds of the state detection branch 11 and the signal output branch 12 are respectively connected to different high and low levels, and different power supplies are input to the first external power input terminal V1 and the second external power input terminal V2, respectively, so as to avoid electrical interference between the state detection branch 11 and the signal output branch 12 affecting the reliability of sensor signal recognition.

[0059] Compared with the prior art, this embodiment provides a compatible interface module. When the state detection branch 11 receives the trigger signal of the digital sensor, it can send an optical signal to the signal output branch 12. The signal output branch 12 sends a first level signal when receiving the optical signal, and sends a second level signal when not receiving the optical signal. Through this circuit design, the first level signal can be directly output according to the trigger signal of the sensor, and the second level signal can be output when the sensor has no trigger signal. There is no need to set an interface matching different sensor types at the front end of the compatible interface module. Different output signals can be obtained directly according to the output state of the sensor, which is conducive to improving the flexibility of signal recognition and signal processing efficiency.

[0060] A second embodiment of the present invention relates to a compatible interface module. Figure 4 As shown, the second embodiment is an improvement on the first embodiment, and the main improvement is that it also includes: an input port 14, which is connected to the state detection branch 11, for receiving the trigger signal of the sensor and transmitting the trigger signal to the state detection branch 11, providing an implementation method of a single-channel compatible interface module.

[0061] Furthermore, it also includes: a port protector 15 for suppressing transient pulses; the input port 14 is grounded via the port protector 15, and the port protector 15 can be implemented by a transient suppression diode TVS.

[0062] A third embodiment of the present invention relates to a compatible interface module. Figure 5 and Figure 6 As shown, the third embodiment is substantially the same as the second embodiment, and the main difference is that: the compatible interface module in this embodiment includes: multiple input ports 14, a port switch U1; multiple input ports 14 are connected to the input end of the port switch U1, and the output end of the port switch U1 is connected to the state detection branch 11; each input port 14 is used to receive a trigger signal of a sensor; the port switch U1 is used to selectively transmit the trigger signal of the sensor received by any input port 14 to the state detection branch 11. A method for implementing a multi-channel compatible interface module is provided, thereby improving the integration of the compatible interface module.

[0063] Since multiple input ports 14 are connected to the port switch U1 to realize the signal input of multiple sensors, there is no need to equip each sensor with a corresponding set of state detection branches 11 and signal output branches 12. Only one set of state detection branches 11 and signal output branches 12 are needed to equip the port switch U1 to realize the signal input of multiple sensors, which provides a multi-channel compatible interface module implementation method, thereby improving the integration of compatible interface modules. It is worth noting that the port switch U1 can be implemented using a data selector, such as a 4-to-1 data selector, an 8-to-1 data selector, or a 16-to-1 data selector, etc. The type of data selector can be selected according to the actual number of sensors to be identified.

[0064] Furthermore, it also includes: a plurality of port protectors 15, each port protector 15 corresponds to an input port, each input port is grounded through the corresponding port protector 15, and the port protector 15 can be implemented by a transient suppression diode TVS.

[0065] like Figure 5 and Figure 6 As shown in FIG. 1 , there are two implementations of the multi-channel compatible interface module in this embodiment. The difference between the two implementations is that the circuit structure of the signal output branch 12 is different. Figure 5 The signal output branch 12 is the same as that in the first embodiment Figure 2 The signal output branch 12 has the same structure, Figure 6 The signal output branch 12 is the same as that in the first embodiment Figure 3 The signal output branch 12 has the same structure.

[0066] Since the circuit structure of the state detection branch 11 in the above two implementations is the same, the connection method of the port switch U1 in the above two implementations is the same. The connection method of the port switch U1 is described below using an 8-to-1 data selector as an example:

[0067] The data selector has two types: high level effective and low level effective. The 8-to-1 data selector in this solution is low level effective. The output terminal Y is connected to the first node 1 of the signal detection module. The eight input terminals D0 to D7 are connected to the input ports respectively. Each input port is grounded through a transient suppression diode to protect the input port from damage by surge voltage and static electricity. The address input terminals S0, S1, and S2 are given different level signals to select the signal output of the corresponding input port in D0 to D7.

[0068] In this embodiment, the 8-to-1 data selector is connected to four input ports, namely input port 1, input port 2, input port 3 and input port 4. Input port 1 is grounded through a transient suppression diode Z1, input port 2 is grounded through a transient suppression diode Z2, input port 3 is grounded through a transient suppression diode Z3, and input port 4 is grounded through a transient suppression diode Z4, thereby realizing protection of each input port.

[0069] The embodiment of the present invention provides a compatible interface module including: multiple input ports, a port switch U1; multiple input ports are connected to the input end of the port switch U1, and the output end of the port switch U1 is connected to the state detection branch 11; each input port is used to receive a trigger signal of a sensor; the port switch U1 is used to selectively transmit the trigger signal of the sensor received by any input port to the state detection branch 11. Since multiple input ports 14 are connected to the port switch U1 to realize the signal input of multiple sensors, there is no need to equip each sensor with a corresponding set of state detection branches 11 and signal output branches 12. Only one set of state detection branches 11 and signal output branches need to be equipped for the port switch U1 to realize the signal input of multiple sensors, which provides a way to realize a multi-channel compatible interface module, thereby improving the integration of the compatible interface module.

[0070] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present invention, and in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A compatible interface module, It is characterized in that include: State detection branch, signal output branch; The state detection branch is used to receive a trigger signal from a sensor and emit a light signal when receiving the trigger signal from the sensor; The sensor is an NPN digital sensor or a PNP digital sensor; The state detection branch includes: a first resistor, a second resistor, a first light emitting diode, a second light emitting diode, a first node for receiving a trigger signal of the sensor, a second node and a first external power input terminal; The first light emitting diode and the second light emitting diode are connected in reverse parallel between the first node and the second node; One end of the first resistor is connected to the second node, and the other end is grounded; One end of the second resistor is connected to the second node, and the other end is connected to the first external power input terminal; The signal output branch is used to receive the optical signal, and the signal output branch outputs a first level signal when receiving the optical signal, and outputs a second level signal when not receiving the optical signal; Wherein, the sensor is an NPN digital sensor; when the NPN digital sensor is triggered, it outputs a low level, the first node receives the low level output by the NPN digital sensor, the first external power input terminal, the second resistor, the first light-emitting diode and the first node form a loop, the current flows from the first external power input terminal to the first node, the first light-emitting diode is turned on, and emits a light signal; when the NPN digital sensor is not triggered, it does not output a level signal, the first node cannot receive a level signal, the state detection branch cannot form a loop, and the first light-emitting diode and the second light-emitting diode are both turned off; Wherein, the sensor is a PNP type digital sensor; when the PNP type digital sensor is triggered, it outputs a high level, the first node receives the high level output by the PNP type digital sensor, the first node, the second light-emitting diode, the first resistor and the ground form a loop, the current flows from the first node to the ground, the second light-emitting diode is turned on, and emits a light signal; when the PNP type digital sensor is not triggered, it does not output a level signal, the first node cannot receive a level signal, the state detection branch cannot form a loop, and the first light-emitting diode and the second light-emitting diode are both not turned on.

2. The compatible interface module according to claim 1, It is characterized in that Also includes: An output port, the output port is connected to the signal output branch, and is used to transmit the level signal output by the signal output branch to the next unit.

3. The compatible interface module according to claim 2, It is characterized in that The signal output branch includes: a photoelectric receiver, a third resistor and a second external power input terminal; One end of the photoelectric receiver is connected to the output port and is connected to the second external power input end through the third resistor; The other end of the photoelectric receiver is grounded.

4. The compatible interface module according to claim 2, It is characterized in that The signal output branch includes: a photoelectric receiver, a third resistor and a second external power input terminal; One end of the photoelectric receiver is connected to the second external power input end; The other end of the photoelectric receiver is connected to the output port and is grounded through the third resistor.

5. The compatible interface module according to claim 1, It is characterized in that Also includes: An input port, the input port is connected to the state detection branch, and is used to receive a trigger signal from the sensor and transmit the trigger signal to the state detection branch.

6. The compatible interface module according to claim 5, It is characterized in that Also includes: Port protectors for suppressing transient pulses; The input port is grounded via the port protector.

7. The compatible interface module according to claim 1, It is characterized in that Also includes: A plurality of input ports and a port switch; the plurality of input ports are connected to the input end of the port switch, and the output end of the port switch is connected to the state detection branch; Each of the input ports is used to receive a trigger signal from the sensor; The port switch is used to selectively transmit the trigger signal of the sensor received by any one of the input ports to the state detection branch.

8. The compatible interface module according to claim 7, It is characterized in that Also includes: A plurality of port protectors, each port protector corresponds to one of the input ports, and each of the input ports is grounded through the corresponding port protector.

9. The compatible interface module according to claim 1, It is characterized in that The state detection branch and the signal output branch are electrically isolated.

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