CN107807629A - Identification Method of Faulty Programmable Logic Control Module in Programmable Control System - Google Patents

Abstract

The invention provides a method for identifying a fault programmable logic control module in a programmable control system, which comprises the following steps: the conversion module sends a random heartbeat signal to the corresponding programmable logic control module in a preset time period; after receiving the heartbeat signal sent by the conversion module, the corresponding programmable logic control module sends a data signal with a specified format to the conversion module, and after receiving the data signal sent by the corresponding programmable logic control module, the conversion module detects whether the heartbeat signal in the received data signal is correct; and if the conversion module detects that the heartbeat signal returned along with the data signal disappears or is wrong, judging that the corresponding programmable logic control module possibly has a fault. Compared with the prior art, the invention can monitor the programmable logic control module with a fault in the bus and quickly find the fault module.

Description

Identification Method of Faulty Programmable Logic Control Module in Programmable Control System

【Technical field】

The invention relates to the technical field of programmable logic control, in particular to a method for identifying faulty programmable logic control modules in a programmable logic control system.

【Background technique】

Programmable Logic Controller (Programmable Logic Controller) is a digital computing operation electronic system specially designed for application in industrial environments. It uses a programmable memory to store instructions for performing logic operations, sequence control, timing, counting, and arithmetic operations, and controls various types of mechanical equipment or production through digital or analog input and output. process.

The existing programmable logic control module does not contain a switching power supply, which cannot effectively isolate the fault of the external power supply with low insulation; the low external insulation will damage the internal power supply chip module. The existing programmable logic control module has few collection points for a single module, the capacity of a single substation is small, and the cost is expensive/difficult to expand. After the existing programmable logic control module is transmitted to the computer to work, it cannot monitor the faulty modules in the bus, and cannot quickly find the faulty modules.

Therefore, it is necessary to provide an improved technical solution to overcome one or more of the above problems.

【Content of invention】

The purpose of the present invention is to provide a method for identifying a faulty programmable logic control module in a programmable logic control system, which can monitor the faulty programmable logic control module in the bus and quickly find the faulty module.

In order to solve the above problems, the present invention provides a method for identifying a faulty programmable logic control module in a programmable control system, which includes: the conversion module sends a random heartbeat signal to its corresponding programmable logic control module in a predetermined time period; After the corresponding programmable logic control module receives the heartbeat signal sent by the conversion module, it sends a data signal in a specified format to the conversion module, and the data signal includes an address signal, a current/voltage signal and the corresponding programmable The heartbeat signal received by the logic control module, wherein the current/voltage signal is an external signal received by the corresponding programmable logic control module; the address signal is the microcomputer in the corresponding programmable logic control module The signal obtained after the self-detection of the processor, after the conversion module receives the data signal sent by the corresponding programmable logic control module, detects whether the heartbeat signal in the received data signal is correct; If the heartbeat signal returned by the signal disappears or is wrong, it is determined that the corresponding programmable logic control module may be faulty.

Further, the programmable control system includes a first workstation, a second workstation and a plurality of programmable logic control subsystems, and each programmable logic control subsystem includes a first conversion module, a second conversion module and M programmable Logic control module, each programmable logic control module is connected with the first conversion module through CAN bus, and the first conversion module is connected with the first workstation through Ethernet; each programmable logic control module is connected with the second conversion module through CAN bus The modules are connected, and the second conversion module is connected to the second workstation through Ethernet, wherein, M is a natural number, and each programmable logic control module receives multiple current/voltage signals, and the received multiple current/voltage signals Process to generate and output data signals; the data signals are transmitted to the first conversion module through the first CAN bus, and the first conversion module converts the data signals it receives from the CAN format to the NET format, the The data signal of NET format is transmitted to the first workstation through Ethernet; The data signal is transmitted to the second conversion module through the second CAN bus, and the second conversion module converts the data signal it receives by CAN format NET format, and the data signal in the NET format is transmitted to the second workstation through Ethernet.

Further, the programmable logic control module communication module, microprocessor and input/output module, the input/output module includes N voltage/current signal interfaces, which are used to receive or send external voltage/current signals, so Said N is a natural number; said communication module comprises a first CAN communication module and a second CAN communication module, said microprocessor is connected with an input/output module, a first CAN communication module and a second CAN communication module, said input/output The output module provides the external current/voltage signal it receives to the microprocessor, and the microprocessor processes the external current/voltage signal it receives to form a data signal, and provides the data signal respectively For the first CAN communication module and the second CAN communication module, the first CAN communication module converts the data signal it receives into a CAN format data signal, and then transmits it to the first conversion module through the first CAN bus; The second CAN communication module converts the received data signal into a CAN format data signal, and then transmits it to the second conversion module through the second CAN bus.

Further, the programmable logic control module also includes a power supply module, the power supply module includes a switching power supply, the input terminal of the switching power supply is connected to an external power supply, and its output terminal supplies power to devices in the programmable logic control module, In addition, the switching power supply is isolated from the external power supply, the M≤16, and the N is equal to 12.

Further, the programmable logic control module includes a buckle, a groove formed on the back of the programmable logic control module, and a receiving groove located outside the groove, and the receiving groove is formed from the programmable logic control module One side of the back extends to the groove, and when the buckle is accommodated in the receiving groove, the feet of the buckle are exposed in the groove to fix the programmable logic control module on the fixing piece located at the groove.

Further, the storage groove includes a first storage groove part extending from one side of the back of the programmable logic control module to the direction of the groove, and continues from the end of the first storage groove part to the groove. The direction extends to the second receiving groove part of the groove, and the stopper located in the middle of the receiving groove, wherein a guide groove is formed on the side wall of the second receiving groove; the buckle includes a buckle body , the head at the top of the buckle body, the feet at the bottom of the buckle body, the shoulders on both sides of the head of the buckle body, and the shoulders on both sides of the buckle body between the shoulders and the feet Guide part; the buckle body includes a cavity through the thickness direction of the buckle body, an elastic clip and a finger extending from the buckle body and located in the cavity; the buckle accommodates in the receiving groove, and can move between the locked position and the unlocked position. When the buckle is in the locked position, the shoulder of the buckle is accommodated in the first receiving groove, and the The bottom end of the shoulder of the buckle abuts against the top end of the side wall of the second receiving groove; the guide part is accommodated in the guiding groove of the second receiving groove; the opening clip of the elastic clip is held on the first side of the widest part of the block, and the fingers are away from the block; the feet of the buckle are exposed in the groove, so that the programmable logic control module is fixed On the fixing member 600 located at the groove, when the buckle is in the release position, part of the shoulder of the buckle withdraws from the first receiving groove, and the shoulder of the buckle The bottom end retreats from the top end of the side wall of the second receiving groove; the opening of the elastic clip is clamped on the second side of the widest part of the stop; the finger is close to the stop and is held by the stop The stopper is blocked; the foot of the buckle retreats into the second receiving groove, so that the programmable logic control module is separated from the fixing part at the groove, and the buckle is released from the When the card position moves to the clamping position, the opening of the elastic clip moves from the second side of the widest part of the stopper through the widest part of the stopper to the first side of the widest part of the stopper. side.

Further, the elastic clip extends from the side of the cavity of the buckle body close to the head of the buckle, and the fingers extend from the foot of the cavity of the buckle body close to the buckle One side of the block is extended; the end adjacent to the finger is formed with a notch, and when the buckle is in the fastened position, the finger part is accommodated in the recess of the block The opening 5362, and the end of the finger part is kept at a certain distance from the bottom of the notch of the stopper; when the buckle is in the unlocking position, the end end of the finger part 5254 is against the stopper bottom of the notch.

Further, the width of the first receiving groove is larger than the width of the second receiving groove, the thickness of the shoulder of the buckle body is larger than the thickness of the guide part; the programmable logic control module is located on the back of the One side of the groove is formed with a plurality of said receiving grooves, and the programmable logic control module also includes several mutually extending from the back part of the programmable logic control module on the other side of the groove to the top of the groove. spaced cards, through which the programmable logic control module hangs on the fixing member at the groove, the buckle also includes a channel formed on the back of the buckle, the buckle The back side is the end surface close to the bottom of the storage tank, the channel is located between the cavity of the buckle body and the feet of the buckle, when the buckle is inserted into or pulled out of the storage tank, the The stopper passes through the channel.

Compared with the prior art, the conversion module in the present invention sends a heartbeat signal to the receiving module at a fixed time period, and after the programmable logic control module receives the heartbeat signal randomly sent by the conversion module, together with the normal current voltage signal and the heartbeat signal, Packing and sending to the conversion module, the conversion module detects whether the heartbeat signal is correct, if the heartbeat signal is wrong, it determines that the corresponding receiving module may be faulty. In this way, the present invention can monitor the faulty programmable logic control module in the bus, and quickly find the faulty module.

【Description of drawings】

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For Those of ordinary skill in the art can also obtain other drawings based on these drawings without any creative effort. in:

Fig. 1 is the structural representation of the programmable logic control system in one embodiment of the present invention;

Fig. 2 is a schematic circuit diagram of a programmable logic control module in Fig. 1 in an embodiment;

Fig. 3 is a top view of the programmable logic control module shown in Fig. 2 in one embodiment;

Fig. 4 is a schematic flowchart of a method for identifying a faulty programmable logic control module in the programmable logic control system shown in Fig. 1;

Fig. 5 is an exploded view of the back structure of the programmable logic control module in one embodiment of the present invention;

Fig. 6 is a schematic structural diagram of the programmable logic control module shown in Fig. 5 when the buckle is in the fastened position;

Fig. 7 is a schematic diagram of the structure of the programmable logic control module shown in Fig. 5 when the buckle is in the unlocking position;

Fig. 8 is a schematic structural view of the back of the buckle shown in Fig. 1 in an embodiment;

Fig. 9 is a schematic diagram of the rear structure of a plurality of programmable logic control modules installed on a fixture in Fig. 10;

FIG. 10 is a schematic structural diagram of a programmable logic control rack in an embodiment of the present invention.

【Detailed ways】

In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

Reference herein to "one embodiment" or "an embodiment" refers to a particular feature, structure or characteristic that can be included in at least one implementation of the present invention. "In one embodiment" appearing in different places in this specification does not all refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments. Unless otherwise specified, the words connected, connected, and joined in this document mean that they are electrically connected directly or indirectly.

(1) Programmable logic control system and programmable logic control subsystem using dual CAN bus communication

Please refer to FIG. 1 , which is a schematic structural diagram of a programmable logic control system in an embodiment of the present invention. The programmable logic control system shown in FIG. 1 includes a first workstation 110 (abbreviated as 1# workstation), a second workstation 120 (abbreviated as 2# workstation) and multiple programmable logic control subsystems (not labeled).

Each programmable logic control subsystem includes a first conversion module 122 (i.e. CAN to NET module 122), a second conversion module 124 (i.e. CAN to NET module 124) and M programmable logic control modules 130, M is a natural number, And M≤16. Both the first conversion module 122 and the second conversion module 124 are CAN (Controller Area Network, controller area network) to NET (Ethernet, Ethernet) modules. Any programmable logic control module 130 in each programmable logic control subsystem is connected to the CAN to NET module 122 through the first CAN bus (CNABUS1), and the CAN to NET module 122 is connected to the first switch 142 through the Ethernet through the first switch 142. The workstations 110 are connected; any programmable logic control module 130 is connected to the CAN to NET module 124 through the second CAN bus (CNABUS2), and the CAN to NET module 124 is connected to the second workstation 120 through the second switch 144 through Ethernet.

Each programmable logic control module 130 receives multiple current/voltage signals, and processes the received multiple current/voltage signals to generate and output data signals. Described data signal is transmitted to CAN to NET module 122 by the first CAN bus, and CAN to NET module 122 converts the data signal that it receives into NET format by CAN format, and the data signal of NET format is transmitted to the first through Ethernet again. Workstation 110; Described data signal is transmitted to CAN to NET module 124 by the second CAN bus, and described CAN turns to NET module 124 and converts the data signal that it receives to NET format by CAN format, and the data signal of NET format passes through Ethernet again The network is transmitted to the second workstation 120.

In the present invention, the programmable logic control module 130 communicates with the conversion module (CAN to NET module 122, CAN to NET module 124) through the CAN bus (the first CAN bus, the second CAN bus). The speed of data transmission is fast. After the data passes through the CAN to NET modules 122 and 124, the data can be quickly transmitted to the computer for centralized monitoring (the conversion module is connected to the switch through Ethernet), and has good interactivity; it adopts dual CAN bus communication, To achieve data redundancy, the dual CAN bus communication can enter the first computer workstation 110 and the second computer workstation 120 respectively through different CAN to NET modules, so that redundant monitoring of the access points can be performed respectively, and the first computer workstation 110 and the second computer workstation 120 can also be effectively redundant to achieve the most secure monitoring.

The present invention adopts a modular design circuit, and a single programmable logic control module 130 (see the description of FIG. Dual CAN bus (i.e. redundant CAN bus) for transmission, while a substation (subsystem) can accommodate 16 such programmable logic control modules 130, such a substation can have 192 points to access, these 192 The points are converted by CAN to NET modules 122 and 124 and then transferred to the computer workstation for centralized monitoring. By expanding n CAN to NET modules, there can be n 192 points of input, and the system’s receivable capacity can be expanded infinitely through this expansion method. Here, n Can be a natural number greater than 2.

(2) The internal structure of the programmable logic control module

Please refer to FIG. 2 , which is a schematic circuit diagram of a programmable logic control module in FIG. 1 in an embodiment. The programmable logic control module shown in FIG. 2 includes an input/output module 210, a communication module (not marked) and a microprocessor (CPU, also called a central processing unit).

The input/output module 210 includes N current/voltage signal interfaces IN, which are used to receive or send current/voltage signals, and the N is a natural number. In the specific embodiment shown in FIG. 2, the input/output The module 210 includes 12 current/voltage signal interfaces IN, and the range of receiving current/voltage signals is 4-20mA or 0-10V. The communication module includes a first CAN communication module 222 and a second CAN communication module 224 , and the microprocessor is connected to the input/output module 210 , the first CAN communication module 222 and the second CAN communication module 224 .

The input/output module 210 provides the received external current/voltage signal to the microprocessor, and the microprocessor processes the received external current/voltage signal to form a data signal, and converts the received external current/voltage signal to the microprocessor. The above data signals are provided to the first CAN communication module 222 and the second CAN communication module 224 respectively. The first CAN communication module 222 converts the data signal it receives into a CAN format data signal, and then transmits the CAN format data signal to the first conversion module 122 through the first CAN bus; the second CAN communication module The 224 converts the received data signal into a CAN format data signal, and then transmits the CAN format data signal to the second conversion module 124 through the second CAN bus. In this way, the programmable logic control module shown in FIG. 2 can realize dual CAN bus communication with the first conversion module 122 and the second conversion module 124 .

In the specific embodiment shown in Figure 2, the first CAN communication module 222 includes a first communication input interface 1#CAN IN and a first communication output interface 1#CAN OUT, and the first communication input interface 1#CAN IN and the second communication output interface 1#CAN OUT are connected to the first conversion module 122 through the first CAN bus; the second CAN communication module 224 includes the second communication input interface 2#CAN IN and the second communication output interface 2#CAN OUT, and the second communication input interface 2#CAN IN and the second communication output interface 2#CAN OUT are connected to the second conversion module 124 through the first CAN bus.

Please continue to refer to Fig. 2, the programmable logic control module shown in Fig. 2 also includes the power module (not marked), the power module includes a switching power supply 232, and the input end of the switching power supply 232 is connected to an external power supply , the output end of which supplies power to the devices in the programmable logic control module, and the switching power supply 232 isolates the low insulation of the external power supply, so that a switching power supply is used to transform the voltage to achieve effective failure of the low insulation of the external power supply isolation. In one embodiment, the switching power supply 232 transforms the voltage received at its input terminal by controlling the switch tube to be turned on and off, so as to output a stable output voltage through its output terminal.

Please continue to refer to FIG. 2 , the power module in the programmable logic control module shown in FIG. 2 also includes a first variable voltage power supply 234 and a second variable voltage power supply 236 .

The input terminal of the first variable voltage power supply 234 is connected to the output terminal of the switching power supply 232, the output terminal of the first variable voltage power supply 234 is connected to the power supply terminal of the first CAN communication module 222, and the first A variable voltage power supply 234 is used to transform the voltage received at its input end to obtain a transformed voltage, and output the transformed voltage through its output end. The input terminal of the second variable voltage power supply 236 is connected to the output terminal of the switching power supply 232, the output terminal of the second variable voltage power supply 236 is connected to the power supply terminal of the second CAN communication module 224, and the first The second variable voltage power supply 236 is used to transform the voltage received at its input end to obtain a transformed voltage, and output the transformed voltage through its output end.

Among them, the switching power supply 232 , the first variable voltage power supply 234 and the second variable voltage power supply 236 can adopt existing power supply circuit and voltage transformation circuit technology, so it will not be repeated here.

In a specific embodiment, the external power supply is a 24V DC power supply; the switching power supply 232 is a 24V to 3V switching power supply; the first variable voltage power supply 234 and the second variable voltage power supply 236 are 3V to 5V variable voltage power supply.

(3) Indicator light structure of the programmable logic control module

Please refer to Figure 2, which shows the internal structure of the indicator light of the programmable logic control module in the present invention, please refer to Figure 3, which is the programmable logic control module shown in Figure 2 in one embodiment A top view of , which shows the external structure of the indicator light of the programmable logic control module.

As shown in FIG. 2 and FIG. 3 , the indicator light of the programmable logic control module in the present invention includes a first light-emitting diode D1, a second light-emitting diode D2, a third light-emitting diode D3, a fourth light-emitting diode D4 and a fifth light-emitting diode D5, and 2N light emitting diodes corresponding to the N current/voltage signal interfaces of the input/output module 210 .

Wherein, the first CAN communication module 222 is connected with the first light-emitting diode D1 (Tx indicates sending data) and the second light-emitting diode D2 (Rx indicates receiving data), and the first light-emitting diode D1 is used to display the first CAN communication Whether the data sent by the module 222 is faulty; the second LED D2 is used to display whether the data received by the first CAN communication module 222 is faulty. Similarly, the second CAN communication module 224 is connected with the third light emitting diode D3 (Tx) and the fourth light emitting diode D4 (Rx), and the third light emitting diode D3 is used to display whether the second CAN communication module 224 sends data There is a fault; the fourth light emitting diode D4 is used to display whether the second CAN communication module 224 has a fault in receiving data. In one embodiment, the first light emitting diode D1 to the fourth light emitting diode D4 blink to indicate whether the corresponding CAN communication module receives data or whether there is a fault in receiving data, for example, when the first light emitting diode D1 blinks, it means The first CAN communication module 222 has data to send, when the first light-emitting diode D1 does not blink, it means that the first CAN communication module 222 has a fault in sending data; when the second light-emitting diode D2 blinks, it means that the first CAN communication module 222 has data For reception, when the second light emitting diode D2 is not blinking, it means that the first CAN communication module 222 has a fault in receiving data.

The microprocessor is connected to the fifth light emitting diode D5, and the fifth light emitting diode D5 is used to display whether the microprocessor is working normally. In one embodiment, the fifth light emitting diode D5 displays whether the microprocessor is working normally by being on or off, for example, when the microprocessor is working normally, the fifth light emitting diode D5 is always on, and when the microprocessor When the processor breaks down, the fifth light-emitting diode D5 is always off; for another example, when the microprocessor works normally, the fifth light-emitting diode D5 is always off, and when the microprocessor breaks down, the fifth light-emitting diode D5 always on.

Each current/voltage signal interface of the input/output module 210 is connected to the microprocessor through two light-emitting diodes, and the two light-emitting diodes are respectively used to display whether the sending signal and receiving signal of the current/voltage signal interface are normal . For example, a current/voltage signal interface on the left side of the input/output module 210 includes pins 1 and 2, wherein pin 2 is connected to the microprocessor through a light-emitting diode D6, a resistor R1 and an optocoupler 1 in sequence; A current/voltage signal interface on the right side of the input/output module 210 includes pins 1 and 2, wherein pin 2 is connected to the microprocessor through the light emitting diode D7, the resistor R2 and the optocoupler 2 in sequence.

(4) Identification method of faulty programmable logic control module in programmable logic control system

Please refer to FIG. 4 , which is a schematic flowchart of a method for identifying a faulty programmable logic control module in the programmable logic control system shown in FIG. 1 . The identification method of the faulty programmable logic control module shown in FIG. 4 will be specifically introduced below in conjunction with FIG. 1 .

Step 410, the conversion modules 122, 124 send a random heartbeat signal to the corresponding programmable logic control module 130 at a predetermined time period;

Step 420, after the corresponding programmable logic control module 130 receives the heartbeat signal sent by the conversion module 122, 124, it sends a data signal in a specified format to the conversion module 122, 124, and the data signal includes an address signal , a current/voltage signal and a heartbeat signal received by the corresponding programmable logic control module 130, wherein the current/voltage signal is an external signal received by the corresponding programmable logic control module; the address signal It is a signal obtained after the self-test of the microprocessor in the corresponding programmable logic control module (similar to the gateway 1-255). In a specific embodiment, the programmable logic control module 130 converts the received external current/voltage signal into a digital signal recognizable by the computer, and then the digital signal, address signal and corresponding programmable logic The heartbeat signal received by the control module 130 is integrated into a data signal of a specified format, and then transmitted to the corresponding conversion modules 122 and 124 through the CAN bus.

Step 430, after receiving the data signal sent by the corresponding programmable logic control module 130, the conversion modules 122 and 124 detect whether the heartbeat signal in the received data signal is correct.

Step 440, if the conversion modules 122 and 124 detect that the heartbeat signal returned along with the data signal disappears or is wrong, then it is determined that the corresponding programmable logic control module 130 may be faulty.

To sum up, the identification method of the faulty PLC module in the present invention can monitor the PLC modules in the PLC system, and can quickly find the faulty PLC module.

(5) The external structure of the programmable logic control module

In order to facilitate the fixing of the programmable logic control module, the invention improves the external structure of the programmable logic control module.

Please refer to Figure 5, which is an exploded view of the back structure of the programmable logic control module in one embodiment of the present invention; please refer to Figure 6, which is the programmable logic control module shown in Figure 5 on the card A schematic diagram of the structure when the buckle is in the clamping position; please refer to FIG. 7 , which is a schematic structural diagram of the programmable logic control module shown in FIG. 5 when the buckle is in the unlocking position.

The programmable logic control module 500 shown in FIGS. 5-7 includes a buckle 520, a groove 510 formed on the back of the programmable logic control module 500, and a receiving groove 530 outside the groove 510. The receiving groove 530 extends from one side of the back of the programmable logic control module to the groove 510 . When the buckle 520 is accommodated in the receiving groove 530, the foot 521 of the buckle 520 is exposed in the groove 510, so as to fix the programmable logic control module 500 in the groove. on the fixing member 600 at the slot 510 .

In the specific embodiment shown in FIGS. 5-7 , the receiving groove 530 includes a first receiving groove portion 532 extending from one side of the back of the programmable logic control module 500 toward the direction of the groove 510 , extending from the The end of the first receiving groove part 532 continues to extend toward the direction of the groove 510 until the second receiving groove part 534 of the groove 510 and the stopper 536 located in the middle of the receiving groove 530, wherein the second receiving groove part 536 A guide groove 5342 is formed on the side wall of the slot 534; the buckle 520 includes a buckle body 525, a head 522 at the top of the buckle body 525, a foot 521 at the bottom of the buckle body 525, and a buckle body 525 at the bottom. The shoulders 523 on both sides of the head 522 of the body 525 and the guides 524 located on both sides of the buckle body 525 and between the shoulders 523 and the feet 521; The cavity 5252 in the thickness direction of the buckle body 525, the elastic clip 5256 and the finger 5254 extending from the buckle body 525 and located in the cavity 5252; the buckle 520 can be accommodated in the receiving groove 530 inside, and can move between the locked position and the unblocked position.

When the buckle 520 is in the locked position (see FIG. 6 for details), the shoulder 523 of the buckle 520 is accommodated in the first receiving groove 532 , and the shoulder 523 of the buckle 520 The bottom end of the second receiving groove part 534 abuts against the top end of the side wall; the guide part 524 is accommodated in the guiding groove 5342 of the second receiving groove part 534; the opening of the elastic clip 5256 clamps On the first side of the widest part of the block 536, the finger 5254 is away from the block 536; the foot 521 of the buckle 520 is exposed in the groove 510, so that the The programming logic control module 500 is fixed on the fixing member 600 located at the groove 510 .

When the buckle 520 is in the unlocking position (see FIG. 7 for details), part of the shoulder 523 of the buckle 520 exits the first receiving groove 532, and the shoulder 523 of the buckle 520 The bottom end is withdrawn from the top of the side wall of the second receiving groove portion 534; the opening of the elastic clip 5256 is clamped on the second side of the widest part of the block; the finger portion 5254 is close to the block 536 and is blocked by the stopper 536; the feet of the buckle 520 retreat into the second receiving groove 534, so that the programmable logic control module 500 is disengaged from the groove 510. Fixture 600. When the buckle 520 moves from the unlocking position to the locking position, the opening of the elastic clip 5256 moves from the second side of the widest part of the stopper 536 through the widest part of the stopper 536 to The first side of the widest part of the block 536 .

In the specific embodiment shown in FIGS. 5-7, the elastic clip 5256 extends from the side of the cavity 5252 of the buckle body 525 close to the head 522 of the buckle 520, and the finger 5254 Extending from the side of the cavity 5252 of the buckle body 525 close to the foot 521 of the buckle 520; the end of the block 536 adjacent to the finger 5254 is formed with a notch 5362, when the When the buckle 520 is in the locked position, the finger portion 5254 is partially received in the notch 5362 of the block 536, and the end of the finger portion 5254 is in contact with the bottom of the notch 5362 of the block 536 Keep a certain distance; when the buckle 520 is in the release position, the end of the finger 5254 abuts against the bottom of the notch 5362 of the blocking block 536 .

In the specific embodiment shown in FIGS. 5-7, the width of the first receiving groove 532 is greater than the width of the second receiving groove 534, and the thickness of the shoulder 523 of the buckle body 525 is greater than that of the guide The thickness of the portion 524; the back side of the programmable logic control module 500 is located on one side of the groove 510, and several of the receiving grooves 530 are formed, and the programmable logic control module 500 also includes the groove 510 The back part of the programmable logic control module 500 on the other side extends to several mutually spaced cards 540 above the groove 510, and the programmable logic control module 500 can be hung on the groove through the cards 540 510 on the fixing member 600 , and then the programmable logic control module 500 is fixed on the fixing member 600 at the groove 510 through buckles 520 .

The head 522 of the buckle body 525 can be used as a push-pull part, by pushing and pulling the head 522 of the buckle body 525 so that the buckle 520 is between the fastened position and the unlocked position of the receiving groove 530 move. The head 522 of the buckle body 525 is formed with a through hole 5222 through the thickness direction of the head 522, and an auxiliary tool can be inserted into the through hole 5222 to drive the buckle 520 in the receiving groove 530. Move between the clamping position and the unlocking position.

Please refer to FIG. 8 , which is a structural schematic view of the back of the buckle shown in FIG. The back of the buckle 520 is the end surface adjacent to the bottom of the receiving groove 530, the channel 550 is located between the cavity 5252 of the buckle body 525 and the foot 521 of the buckle 520, and inserted into the buckle 520 Or when withdrawing from the receiving groove 530 , the stopper 536 passes through the channel 550 .

Please refer to FIG. 10 , which is a schematic structural diagram of a programmable logic control shelf in an embodiment of the present invention. The programmable logic control rack shown in FIG. 10 includes a mounting plate 700, a plurality of fixing parts 600 and a plurality of programmable logic control modules 500 as shown in FIGS. 5-7.

Wherein, a plurality of fixing pieces 600 are sequentially fixed on the end surface of the installation board 700 , wherein each fixing piece 600 is sequentially fixed with a plurality of programmable logic control modules 500 . Please refer to FIG. 9 , which is a schematic diagram of the back structure of a plurality of programmable logic control modules 500 installed on a fixing member 600 in FIG. 10 . In the embodiment shown in FIG. 5 and FIG. 10 , the fixing member 600 is a strip plate.

It should be pointed out that any changes made by those skilled in the art to the specific embodiments of the present invention will not depart from the scope of the claims of the present invention. Accordingly, the scope of the claims of the present invention is not limited only to the foregoing specific embodiments.

Claims (8)

1. the recognition methods of failure universal logic module in a kind of programmable control system, it is characterised in that it includes：

Modular converter gives its corresponding universal logic module with predetermined period of time and sends random heartbeat signal；

After universal logic module corresponding to described receives the heartbeat signal that the modular converter is sent, send and specify lattice The data-signal of formula gives the modular converter, and the data-signal includes address signal, current/voltage signal and described corresponding The heartbeat signal that universal logic module receives, wherein, the current/voltage signal is patrolled for corresponding may be programmed Collect the external signal that control module receives；The address signal is micro- place in the corresponding universal logic module The signal obtained after self detection of reason device,

After the modular converter receives the data-signal that corresponding universal logic module is sent, the number received is detected It is believed that number in heartbeat signal it is whether correct；

If the modular converter detects the heartbeat signal disappearance returned with data-signal or mistake, may be programmed corresponding to judgement Logic control module there may be failure.

2. the recognition methods of failure universal logic module in programmable control system according to claim 1, its It is characterised by, the programmable control system includes first work station, second work station and multiple Programmable logical controller subsystems System,

Each Programmable logical controller subsystem includes the first modular converter, the second modular converter and M Programmable logical controller Module,

Each universal logic module is connected by CAN with the first modular converter, and first modular converter passes through Ethernet is connected with first work station；Each universal logic module is connected by CAN with the second modular converter, institute The second modular converter is stated by Ethernet with second work station to be connected, wherein, M is natural number,

Each universal logic module receives multiple current/voltage signals, and multiple current/voltage signals to receiving Handled, to produce simultaneously outputting data signals；The data-signal is transferred to first modulus of conversion by the first CAN Block, the data-signal that first modular converter is received are converted to NET forms by CAN forms, the data of the NET forms Signal is transferred to first work station by Ethernet again；The data-signal is transferred to described second turn by the second CAN Block is changed the mold, the data-signal that second modular converter is received is converted to NET forms by CAN forms, the NET forms Data-signal is transferred to second work station by Ethernet again.

3. the recognition methods of failure universal logic module in programmable control system according to claim 2, its It is characterised by, universal logic module communication module, microprocessor and the input/output module,

The input/output module includes N number of voltage/current signals interface, and it is used to receive or sends external voltage/electric current letter Number, the N is natural number；

The communication module includes the first CAN communication module and the second CAN communication module, the microprocessor and input/output Module, the first CAN communication module are connected with the second CAN communication module,

Foreign current/voltage signal that the input/output module is received is supplied to the microprocessor, micro- place Foreign current/voltage signal that reason device receives to it is handled to form data-signal, and the data-signal is distinguished The first CAN communication module and the second CAN communication module are supplied to, the data letter that the first CAN communication module is received Number the data-signal of CAN forms is converted into, then the first modular converter is transferred to by the first CAN；Second CAN communication The data-signal that module is received is converted into the data-signal of CAN forms, then is transferred to second turn by the second CAN Change the mold block.

4. the recognition methods of failure universal logic module in programmable control system according to claim 3, its It is characterised by, the universal logic module also includes power module, and the power module includes Switching Power Supply, described to open The input in powered-down source is connected with external power supply, and its output end is powered to the device in the universal logic module, and institute State that insulation of the Switching Power Supply to external power supply is low to be isolated,

M≤16, the N are equal to 12.

5. the recognition methods of failure universal logic module in programmable control system according to claim 1, its It is characterised by,

The universal logic module includes buckle, the groove for being formed at the universal logic module back side and position Accepting groove on the outside of the groove, the accepting groove extend to described from the side at the universal logic module back side Groove,

When the buckle is contained in the accepting groove, the foot of the buckle is exposed in the groove, can by described in Programmed logic control module is fixed on the fixture of the groove.

6. the recognition methods of failure universal logic module in programmable control system according to claim 5, its It is characterised by,

The accepting groove includes first of the lateral groove direction extension from the universal logic module back side House groove portion, continue to extend up to the second collecting of the groove to the groove direction from the end of the described first collecting groove portion Groove portion, the block in the middle part of the accepting groove, wherein, formed with guide channel in the side wall of second accepting groove；

The buckle include buckle body, positioned at the head on buckle body top, the foot positioned at buckle body bottom, positioned at card Detain the shoulder of the head on both sides of body and positioned at buckle body both sides and the guidance part between the shoulder and foot；Institute Stating buckle body includes the cavity through the buckle body thickness direction, extends being formed from the buckle body and be located at institute State the elastic clip in cavity and finger portion；

The buckle is contained in the accepting groove, and is moved between can conciliating card position fixing position,

When the buckle, which is in, fixes position, the shoulder of the buckle is contained in the first collecting groove portion and the card The bottom of the shoulder of button is butted on the described second side wall top for housing groove portion；The guidance part is contained in described second and houses groove portion Guide channel in；The opening of the elastic clip is held on the first side of the widest portion of the block, and the finger portion is away from described Block；The foot of the buckle is exposed in the groove, so that the universal logic module is fixed on positioned at described On the fixture 600 of groove,

When the buckle is in solution card position, the shoulders of the buckle exit described first and house groove portion and the card Recess the described second side wall top for housing groove portion in the bottom of the shoulder of button；The opening of the elastic clip is held on the block Second side of widest portion；The finger portion stops close to the block and by the block；The foot of the buckle is retracted into described Second houses in groove portion, to cause the universal logic module to depart from the fixture positioned at the groove,

When the buckle is moved to by solution card position and fixes position, the opening of the elastic clip by the block widest portion The second side by the block widest portion be moved to the block widest portion the first side.

7. the recognition methods of failure universal logic module in programmable control system according to claim 6, its It is characterised by,

From the side on the head of the close buckle of the cavity of the buckle body, extension forms the elastic clip, and the finger portion is from institute The side extension for stating the foot of the close buckle of the cavity of buckle body forms；

Block one end adjacent with the finger portion is formed with recess, when the buckle, which is in, fixes position, the finger portion The recess 5362 for being partially housed in the block and the bottom of the recess of end and the block in the finger portion maintain one Fixed distance；When the buckle is in solution card position, the end in the finger portion 5254 abuts against the bottom of the recess of the block Portion.

8. the recognition methods of failure universal logic module in programmable control system according to claim 7, its It is characterised by,

Described first width for housing groove portion is more than described second and houses well width, and the thickness of the shoulder of the buckle body is more than The thickness of the guide portion；

It is located at the side of the groove on the back side of universal logic module, can formed with the accepting groove described in several The back portion that programmed logic control module also includes the universal logic module of the opposite side from the groove extends to Several spaced cards above groove, the universal logic module is affiliated in described by the card On the fixture of groove,

The buckle also includes the conduit for being formed at the buckle back side, and the back side of the buckle is close to the collecting trench bottom End face, the conduit inserts in the buckle between the cavity of the buckle body and the foot of buckle or detaches institute When stating accepting groove, the block passes through the conduit.