KR102434128B1 - Programmable logic controller system - Google Patents

Abstract

A PLC system according to an embodiment of the present invention includes first and second function modules; a base module receiving a first feedback signal related to an interrupt operation from any one of the first and second function modules; and a processor receiving the first feedback signal from the base module and identifying a function module that provided the first feedback signal from among the first and second function modules, wherein the first and second function modules include: It is characterized in that it is detected whether the first feedback signal is mutually provided.

Description

PLC system {PROGRAMMABLE LOGIC CONTROLLER SYSTEM}

The present invention relates to a PLC system, and more particularly, to a PLC system capable of effectively processing an interrupt request from a function module.

A PLC system (Programmable Logic Controller System; Programmable Logic Controller System) is a device that controls various devices or equipment in an industrial field.

1 is a view for explaining a conventional PLC system.

Referring to FIG. 1 , a conventional PLC system 100 includes a first power module 110 and a second power module 150 , a processor 120 , and first to N-th function modules for supplying power to each module ( 130-1 to 130-N).

The main base module 10 and the extension base module 20 may mechanically and electrically connect various modules. And, the user can add a plurality of function modules by connecting the extension base module 20 to the main base module 10 through the extension cable 30 .

Here, each of the first to N-th function modules 130-1 to 130-N is one of the modules that may be provided in the conventional PLC system 100, such as an analog input module, an analog output module, a digital input module, and a digital output module. can mean one.

Meanwhile, the processor 120 receives an input value from the first function module 130-1 to the N-th function module 130-N according to a predetermined period, and executes a program based on the received input value to perform logic and sequencing. , timing, counting, etc. can be processed. In addition, the processor 120 may provide an output value as a result of executing the program to the first to Nth function modules 130-1 to 130-N.

As described above, a series of processes in which the processor 120 receives an input value, executes a program, and provides an output value is referred to as 'scan'.

When the processor 120 receives a request for an interrupt operation from at least one of the first to N-th function modules 130-1 to 130-N while performing the scan, the processor 120 stops the scan and preferentially performs the preset interrupt operation. .

Here, each of the first to Nth function modules 130-1 to 130-N may output an interrupt operation request signal when a preset interrupt condition is satisfied.

The processor 120 may receive the interrupt operation request signal output from each of the first to Nth function modules 130-1 to 130-N through a wired-AND connection. In other words, when any one of the first to Nth function modules outputs an interrupt operation request signal, the processor 120 may detect whether an interrupt operation is requested.

However, in the conventional PLC system 100, the processor 120 can only detect whether an interrupt operation is requested or not, and cannot determine which function module has transmitted the interrupt operation request signal.

Accordingly, the processor 120 is a function module (for example, the first function module 130-1) located farthest from the function module (eg, the first function module 130-1) located close to the processor 120 in the conventional PLC system 100 ( For example, it is possible to sequentially search up to the N-th function module 130 -N), find a function module that has requested an interrupt operation, and perform a preset interrupt operation for the corresponding function module.

That is, in the conventional PLC system 100, since the processor 120 could not determine which function module transmitted the interrupt operation request signal, it takes time to find the function module that requested the interrupt operation after receiving the interrupt operation request signal. There is a problem with being

In addition, in the conventional PLC system 100, since the processor 120 sequentially searches for function modules each time it receives an interrupt operation request signal, as the number of function modules increases, the interrupt operation is performed after receiving the interrupt operation request signal. There is a problem in that the time it takes to execute is increased.

An object of the present invention is to provide a PLC system that can omit the process of finding the function module requesting the interrupt operation by providing a signal corresponding to the identifier of the function module requesting the interrupt operation to the processor.

In addition, the present invention provides the processor with a signal corresponding to the identifier of the function module that requested the interrupt operation, so that even if the number of function modules increases, the time required to perform the interrupt operation after receiving the interrupt operation request can be kept constant. It aims to provide a PLC system with

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention not mentioned may be understood by the following description, and will be more clearly understood by the examples of the present invention. It will also be readily apparent that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the appended claims.

A PLC system according to an embodiment of the present invention includes first and second function modules; a base module receiving a first feedback signal related to an interrupt operation from any one of the first and second function modules; and a processor receiving the first feedback signal from the base module and identifying a function module that provided the first feedback signal from among the first and second function modules, wherein the first and second function modules include: It is characterized in that it is detected whether the first feedback signal is mutually provided.

The PLC system according to an embodiment of the present invention provides the processor with a signal corresponding to the identifier of the function module requesting the interrupt operation, thereby omitting the process of finding the function module requesting the interrupt operation. Accordingly, the time for the processor to stop scanning may be reduced, and processing performance of the entire PLC system may be increased.

In addition, the PLC system according to an embodiment of the present invention provides a signal corresponding to the identifier of the function module that requested the interrupt operation to the processor, so that even if the number of function modules increases, the interrupt operation is performed after receiving the interrupt operation request. The time required can be kept constant. Accordingly, even if the number of function modules increases, the interrupt operation of the function module can be efficiently processed.

1 is a schematic diagram illustrating a conventional PLC system.
2 is a schematic diagram illustrating a PLC system according to an embodiment of the present invention.
3 is a schematic diagram illustrating a connection relationship between the configurations of the PLC system of FIG. 2 .
FIG. 4 is a schematic diagram illustrating a PLC system centering on the first conductive line of FIG. 3 .
FIG. 5 is a view for explaining a first feedback signal applied to the first conductive line of FIG. 3 .
FIG. 6 is a schematic diagram illustrating a PLC system centering on the second conductive line of FIG. 3 .
FIG. 7 is a view for explaining an example of a second feedback signal applied to the second conductive line of FIG. 3 .
FIG. 8 is a view for explaining another example of a second feedback signal applied to the second conductive line of FIG. 3 .
9 is a flowchart illustrating an interrupt operation processing method performed by the first function module of FIG. 2 .
10 is a flowchart specifically explaining S940 of FIG. 9 .
11 is a view for explaining a method of processing an interrupt operation performed by the processor of FIG. 2 .

The above-described objects, features and advantages will be described below in detail with reference to the accompanying drawings, and accordingly, those skilled in the art to which the present invention pertains will be able to easily implement the technical idea of the present invention. In describing the present invention, if it is determined that a detailed description of a known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description will be omitted.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to indicate the same or similar components.

Hereinafter, a PLC system according to an embodiment of the present invention will be described with reference to FIGS. 2 and 3 .

2 is a schematic diagram illustrating a PLC system according to an embodiment of the present invention. 3 is a schematic diagram illustrating a connection relationship between the configurations of the PLC system of FIG. 2 .

The PLC system 200 is a device for controlling various devices or facilities in an industrial field.

The PLC system 200 may perform various operations such as logic, sequencing, timing counting, or calculation through various function modules and the processor 240 .

Specifically, the PLC system 200 may include a base module 210 , a first function module 220 , a second function module 230 , and a processor 240 .

For reference, the PLC system 200 may further include a power module (not shown) for supplying power to various modules, a third function module (not shown) to an Nth function module 340 , but hereinafter, the base module The PLC system 200 will be described with reference to 210 , the first function module 220 , the second function module 230 , and the processor 240 .

The base module 210 may be a module that mechanically and electrically connects various modules of the PLC system 200 . Specifically, the base module 210 may include a plurality of slots to which various modules of the PLC system 200 may be mechanically and electrically connected.

In addition, various modules connected to the base module 210 may communicate with each other through various conductors and data bus 310 provided in the base module 210 .

Specifically, the processor 240 , the first function module 220 to the Nth function module 340 may all be connected to the base module 210 . In addition, the processor 240 , the first function module 220 to the Nth function module 340 may be implemented in a form detachable from the base module 210 , respectively.

For reference, although the PLC system 200 is illustrated as including only one base module 210 in FIGS. 2 and 3 , this is only an example, and the PLC system 200 according to an embodiment of the present invention is expanded The base module (not shown) may further include an extension cable connecting the extension base module and the base module 210 .

The base module 210 may include a data bus 310 , a first conductive wire 320 , and a second conductive wire 330 .

The data bus 310 may be a path through which various modules connected to the base module 210 transmit data.

In addition, the data bus 310 may be connected to the processor 240 and the first function module 220 to the Nth function module 340 . Accordingly, each of the processor 240 and the first function module 220 to the Nth function module 340 connected to the base module 210 may transmit or receive data through the data bus 310 .

Meanwhile, the first conductive wire 320 may be a conductive wire connected to the processor 240 and the first function module 220 to the Nth function module 340 .

Specifically, the first conductive wire 320 may be used to provide a first feedback signal related to an interrupt operation to each of the first function module 220 to the Nth function module 340 .

Here, the first feedback signal may mean a signal applied to the first conductive line 320 . The base module may receive the first feedback signal from any one of the first function module 220 and the second function module 230 .

The first conductive wire 320 will be described in detail with reference to FIGS. 4 and 5 .

The second conductor 330 may also be a conductor connected to the processor 240 , the first function module 220 to the Nth function module 340 , like the first conductor 320 . Specifically, the second conductive wire 330 may be used to provide a second feedback signal related to the identifier of each of the first function module 220 to the Nth function module 340 .

Here, the second feedback signal may mean a signal applied to the second conductive line 330 .

Meanwhile, the function module may include various modules that may be provided in the PLC system 200 , such as an analog input module, an analog output module, a digital input module, a digital output module, and a communication module.

For example, the digital input module may be a module that receives a digital signal from an external device connected thereto and transmits it to another module provided in the PLC system 200 . In addition, the digital output module may be a module that receives an output value from the processor 240 and provides it to an external device as a digital signal.

Furthermore, the analog input module may be a module that receives an analog signal from an external device connected thereto and transmits it to another module provided in the PLC system 200 . In addition, the analog output module may be a module that receives an output value from the processor 240 and provides it to an external device as an analog signal.

The communication module may be a module that enables communication according to various communication protocols such as Ethernet.

Meanwhile, each of the first function module 220 to the Nth function module 340 may be one of the various function modules described above.

Here, the first function module 220 and the second function module 230 may detect whether a first feedback signal is provided to each other.

Specifically, the first function module 220 is connected to the first conductor 320 and the second conductor 330, and when a preset first interrupt condition is satisfied, the first switch connected to the first conductor 320 ( 411) is turned on to apply a first feedback signal of a low level (eg, 0) to the first conductive wire 320 , and a second switch connected to the second conductive wire 330 is turned on Alternatively, by turning it off, a second feedback signal of a low level or a high level (eg, 1) corresponding to the first identifier may be sequentially applied to the second conductor 330 .

For reference, the identifier may be a preset binary identifier of each of the first function module 220 to the Nth function module 340 . And, the identifier may be composed of M bits. Here, M may mean any positive integer.

For example, the identifier may be a unique identifier preset for each function module, such as a slot number of each function module, a serial number of each function module, and a MAC address of each function module in the PLC system 200 . Here, the slot number may mean a number of a slot to which each function module is connected in the PLC system 200 .

Hereinafter, the first identifier to the N-th identifier may refer to preset identifiers of the first function module 220 to the N-th function module 340 , respectively.

For example, when each of the first identifier to the N-th identifier is a slot number of each of the first function module 220 to the N-th function module 340, the first identifier is 0001, the second identifier is 0010, and the third identifier is the third identifier. can be 0011.

Meanwhile, the interrupt operation may be an operation that requires priority processing by the processor 240 .

Specifically, when the processor 240 receives a request for an interrupt operation from the first function module 220 to the N-th function module 340 , the processor 240 stops the operation and performs the interrupt operation preset for the function module requesting the interrupt operation. can be done first.

Here, the preset interrupt condition may be a condition for requesting an interrupt operation from the processor 240 . For reference, the preset interrupt condition may be preset for each of the first function module 220 to the Nth function module 340 .

Hereinafter, the preset first interrupt condition to the preset N-th interrupt condition may be preset interrupt conditions of the first function module 220 to the N-th function module 340 , respectively.

In addition, the preset interrupt operation is an operation that the processor 240 should perform according to the interrupt operation request, and may be preset for each function module that has requested the interrupt operation.

For example, when the first function module 220 is an analog input module receiving a current value from a motor, the preset first interrupt condition may be a condition in which the current value is 0.1 mA or less.

Accordingly, when the current value provided from the motor is 0.1 mA or less, the first function module 220 may request an interrupt operation from the processor 240 . Then, the processor 240 may perform a preset interrupt operation (eg, an operation of supplying emergency power to the motor) corresponding to the first function module 220 .

For another example, when the second function module 230 is a digital input module receiving a digital signal from an emergency switch, the preset second interrupt condition is a condition in which the emergency stop switch is turned on to receive a digital signal. can

Accordingly, when the received digital signal becomes a high level signal, the second function module 230 may request an interrupt operation from the processor 240 . Then, the processor 240 may perform a preset interrupt operation corresponding to the second function module 230 (eg, an operation of turning off the power of all external devices connected to the PLC system 200 ).

When the first function module 220 is described again, the first function module 220 may request an interrupt operation from the processor 240 by turning on the first switch 411 when a preset first interrupt condition is satisfied. have.

The operation of the first function module 220 will be described in detail with reference to FIGS. 4 to 8 .

Meanwhile, the second function module 230 is connected to the first conductive wire 320 and the second conductive wire 330 , and when a preset second interrupt condition is satisfied, a high level first feedback to the first conductive wire 320 is satisfied. It can be determined whether a signal is applied.

In addition, the second function module 230 turns on the third switch 421 connected to the first conductive wire 320 when a high-level first feedback signal is applied to the first conductive wire 320 to turn on the first conductive wire ( A first feedback signal of a low level is applied to the 320, and the fourth switch 621 connected to the second conductor 330 is turned on or off to achieve a high level or a low level (high level) corresponding to the second identifier. A second feedback signal of a low level) may be sequentially applied to the second conductive line 330 .

Specifically, when a preset second interrupt condition is satisfied, the second function module 230 may request an interrupt from the processor 240 by turning on the third switch 421 .

The operation of the second function module 230 will also be described in detail with reference to FIGS. 4 to 8 .

For reference, in the present invention, the first function module 220 and the second function module 230 may operate in the same manner as each other, and the third function module (not shown) to the Nth function module 340 may also operate in the first It may operate in the same manner as the function module 220 and the second function module 230 . Therefore, hereinafter, the operation of the PLC system 200 will be described focusing on the first function module 220 and the second function module 230 .

Furthermore, the processor 240 is connected to the first conductor 320 and the second conductor 330 , and when a first feedback signal of a low level is applied to the first conductor 320 , Any one of the first identifier and the second identifier may be identified based on the sequentially applied high-level or low-level second feedback signal, and a preset interrupt operation corresponding to the identified identifier may be executed.

The processor 240 may perform a scan according to a preset period.

Here, the scan is a series of processes in which the processor 240 receives input values from various function modules, executes the program stored in the processor 240 based on the input values, and provides output values that are the execution results of the program to various function modules. It can mean process.

Specifically, the processor 240 executes a program based on an input value provided from the first function module 220 to the N-th function module 340 according to a preset period to perform various processes such as logic, sequencing, timing, and counting. can be done In addition, the processor 240 may provide an output value that is an execution result of the program to the first function module 220 to the Nth function module 340 .

When the processor 240 receives a request for an interrupt operation from at least one of the first function module 220 to the N-th function module 340 , the processor 240 stops scanning and prioritizes a preset interrupt operation corresponding to the function module requesting the interrupt operation. can be done with

A preset interrupt operation corresponding to each of the first function module 220 to the Nth function module 340 may be stored in the processor 240 . In addition, the identifier of each of the first function module 220 to the Nth function module 340 may be matched to each of the preset interrupt operations and stored in the processor 240 .

Hereinafter, the operation of the PLC system 200 will be described with reference to FIGS. 4 and 5 , centering on the first conductive wire 320 .

FIG. 4 is a schematic diagram illustrating a PLC system centering on the first conductive line of FIG. 3 . FIG. 5 is a view for explaining a first feedback signal applied to the first conductive line of FIG. 3 .

In FIG. 4 , R1 may be a resistor having a preset resistance value. And, VCC1 may be a voltage source having a preset voltage value.

R1 may be used as a pull-up resistor in the first conductive wire 320 . That is, when all switches connected to the first conductive wire 320 in the first function module 220 to the Nth function module 340 are turned off, a floating phenomenon does not occur due to R1, and the first conductive wire A voltage value of VCC1 (ie, a high level signal) may be applied to 320 .

The first function module 220 may include a first switch 411 , an A1 node 412 , and a controller 413 .

Here, the first switch 411 may be an NPN transistor. As shown, the emitter of the first switch 411 is connected to the ground, the base of the first switch 411 is connected to the controller 413 , and the The collector may be connected to the first conductive line 320 .

The A1 first node 412 may be a node positioned between the first switch 411 and the first conductive line 320 .

The controller 413 may be connected to the base of the first switch 411 and the A1 first node 412 . In addition, the controller 413 may turn on or turn off the first switch 411 by outputting a low level signal or a high level signal to the base of the first switch 411 .

Here, the first function module 220 to the Nth function module 340, each control unit is connected to the first conductive wire 320 in each of the first function module 220 to the Nth function module 340, the base of the switch A signal output to ' is defined as a 'first interrupt signal' to an 'Nth interrupt signal'.

That is, a signal output by the control unit 413 to the base of the first switch 411 is defined as a 'first interrupt signal'. In addition, a signal output by the control unit 423 to the base of the third switch 421 is defined as a 'second interrupt signal'.

Specifically, when the controller 413 outputs the first interrupt signal of a low level, the first switch 411 may be turned on. Then, a first feedback signal of a low level may be applied to the first conductive line 320 .

In addition, when the controller 413 outputs a high level first interrupt signal, the first switch 411 may be turned off. In this case, when all the switches connected to the first conductive wire 320 in the first function module 220 to the Nth function module 340 are turned off, a high level first feedback signal is applied to the first conductive wire 320 . can be

Furthermore, the controller 413 may sense the first feedback signal applied to the first conductive line 320 through the A1 first node 412 .

For reference, each of the control unit 423 , the third switch 421 , and the A2 node 422 of the second function module 230 includes the control unit 413 and the first switch 411 of the first function module 220 . , may be implemented and operated in the same manner as each of the first node A1 412 , and a duplicate description will be omitted below.

Similarly, the control unit, the switch, and the node of each of the third function module (not shown) to the Nth function module 340 are the control unit 413 , the first switch 411 , and the A1 node of the first function module 220 , respectively. It may be implemented and operated in the same manner as (412), and repeated descriptions will be omitted below.

Hereinafter, the operation performed by each of the first function module 220 to the Nth function module 340 means an operation performed by the control unit provided in each of the first function module 220 to the Nth function module 340 . can do.

On the other hand, when at least one of the switches provided inside the first function module 220 to the Nth function module 340 and connected to the first conductive wire 320 is turned on, the first conductive wire 320 is connected to the ground, The first feedback signal may be a low level signal.

For example, from t2 to t4, from t5 to t7, and from t8 to t9, the first feedback signal may be a low-level signal.

In addition, when all the switches connected to the first conductive wire 320 in the first function module 220 to the Nth function module 340 are turned off, the first feedback signal may be a high level signal.

For example, from t1 to t2, from t4 to t5, and from t7 to t8, the first feedback signal may be a high level signal.

According to an embodiment of the present invention, when a preset first interrupt condition is satisfied, the first function module 220 turns on the first switch 411 to provide a low-level first feedback signal to the first conductor 320 . can be authorized.

Specifically, when a preset first interrupt condition is satisfied, the first function module 220 may request an interrupt operation from the processor 240 by outputting a first interrupt signal of a low level. Then, the first switch 411 may be turned on, and a first feedback signal of a low level may be applied to the first conductive wire 320 .

For example, if the first interrupt condition preset before t2 is satisfied, the first function module 220 may apply the first feedback signal of a low level at t2. In addition, if the first interrupt condition preset before t8 is satisfied, the first function module 220 may apply the first feedback signal of a low level at t8.

Furthermore, when a preset first interrupt condition is satisfied, the first function module 220 may determine whether the first feedback signal is a high level signal.

Through this, the first function module 220 may determine whether the second function module 230 requests an interrupt operation. This is because the first feedback signal can be a high level signal only when the second function module 230 outputs the high level second interrupt signal.

When the first feedback signal is a high level signal, the first function module 220 may output a low level first interrupt signal to turn on the first switch 411 . Then, a low level signal may be applied to the first conductive line 320 . That is, the first feedback signal may be a low level signal.

For example, when a preset first interrupt condition is satisfied between t5 and t7, the first function module 220 may wait until the first feedback signal becomes a high-level signal. Since the first feedback signal becomes a high level signal at t7 , the first function module 220 may output a low level first interrupt signal at t8 .

Then, after outputting the first interrupt signal of the low level, the first function module 220 turns on or off the second switch 611 to provide a second feedback signal of a low level or a high level corresponding to the first identifier. may be sequentially applied to the second conductor 330 . The operation of the first function module 220 with respect to the second conductive wire 330 will be described in detail with reference to FIGS. 6 to 8 .

Like the first function module 220 , the second function module 230 may determine whether the first feedback signal is a high level signal when a preset second interrupt condition is satisfied.

And, when the first feedback signal is a high level signal, the second function module 230 may output a second interrupt signal of a low level. Then, the third switch 421 is turned on, and the first feedback signal may be a low level signal. That is, a low level signal may be applied to the first conductive line 320 .

For example, when the second interrupt condition preset in the second function module 230 is satisfied between t5 and t7, the second function module 230 may wait until the first feedback signal becomes a high level signal. have. Since the second feedback signal becomes a high level signal at t7 , the second function module 230 may output a low level second interrupt signal at t8 .

Furthermore, the second function module 230 outputs the second interrupt signal of a low level, and then turns on or off the fourth switch 621 to provide a high level or low level second feedback signal corresponding to the second identifier. may be sequentially applied to the second conductor 330 .

Meanwhile, since the processor 240 is connected to the first conductive wire 320 , it may receive a first feedback signal (ie, a signal applied to the first conductive wire 320 ) from the base module 210 . In addition, the processor 240 may identify a function module that provided the first feedback signal from among the first function module 220 and the second function module 230 .

First, the processor 240 may determine whether a function module requesting an interrupt operation exists through the first feedback signal.

Specifically, when the processor 240 detects the high-level first feedback signal, the processor 240 may determine that the function module requesting the interrupt operation does not exist.

In addition, when the processor 240 detects the low-level first feedback signal, the processor 240 may determine that a function module requesting an interrupt operation exists.

Furthermore, after the processor 240 detects the low-level first feedback signal, the processor 240 may detect the high-level or low-level second feedback signal sequentially applied to the second conductive wire 330 . .

Accordingly, the processor 240 may identify any one of the first and second identifiers based on the high-level or low-level second feedback signal sequentially applied to the second conductor 330 . Then, the processor 240 may execute a preset interrupt operation corresponding to the identified identifier.

Hereinafter, the operation of the PLC system 200 will be described with reference to FIGS. 6 to 8 , centering on the second conductive line 330 .

FIG. 6 is a schematic diagram illustrating a PLC system centering on the second conductive line 330 of FIG. 3 . FIG. 7 is a view for explaining an example of a second feedback signal applied to the second conductive line 330 of FIG. 3 . FIG. 8 is a view for explaining another example of a second feedback signal applied to the second conductive line 330 of FIG. 3 .

For reference, a signal may be applied to the second conductor 330 in FIGS. 6 to 8 in the same manner as that of the first conductor 320 in FIGS. 4 and 5 . Hereinafter, the difference will be mainly described. .

In FIG. 6 , R2 may be a resistor having a preset resistance value like R1 in FIG. 4 . In addition, VCC2 may be a voltage source having a preset voltage value like VCC1 of FIG. 4 . R2 may also be used as a pull-up resistor in the second conductor 330 like R1 of FIG. 4 .

The first function module 220 may include a second switch 611 , a B1 th node 612 , and a controller 413 .

Here, the second switch 611 may be an NPN transistor. The emitter of the second switch 611 may be connected to the ground, the base of the second switch 611 may be connected to the controller, and the collector of the second switch 611 may be connected to the second conductor 330 . In addition, the B1 th node may be a node positioned between the second switch 611 and the second conductive line 330 .

The control unit may be connected to the base of the second switch 611 and connected to the B1 th node. The controller may turn on or off the second switch 611 by outputting a second feedback signal of a low level or a high level to the base of the second switch 611 .

Hereinafter, the control unit of each of the first function modules 220 to the Nth function module 340 of the switch connecting the second conductive wire 330 in each of the first function module 220 to the Nth function module 340 . A signal output to the base is defined as a 'first identifier signal' to an 'Nth identifier signal'.

That is, a signal output by the controller 413 to the base of the second switch 611 is defined as a 'first identifier signal'. And, a signal output by the controller 423 to the fourth switch 621 is defined as a 'second identifier signal'.

Specifically, when the controller 413 outputs the first identifier signal of a low level, the second switch 611 may be turned on. Then, a second feedback signal of a low level may be applied to the second conductor 330 .

And, when the controller outputs the first identifier signal of a high level, the second switch 611 may be turned off. In this case, when the switches connected to the second conductor 330 in the first function module 220 to the Nth function module 340 are all turned off, a high level second feedback signal is applied to the second conductor 330 . can be

Furthermore, the controller may sense the second feedback signal applied to the second conductive line 330 through the B1 th node.

For reference, each of the control unit 423 , the fourth switch 621 , and the B2 th node 622 of the second function module 230 includes the control unit 413 and the second switch 611 of the first function module 220 . and may be implemented and operated in the same manner as each of the B2 th node 612 , and a duplicate description will be omitted below.

Similarly, the control unit, the switch, and the node of each of the third function module (not shown) to the Nth function module 340 are the same as the control unit, the second switch 611, and the B1 node of the first function module 220, respectively. may be implemented and operated, and a redundant description will be omitted below.

The first function module 220 turns on the first switch 411 to apply a first feedback signal of a low level to the first conductive wire 320 , and then a second switch 611 connected to the second conductive wire 330 . may be turned on or off to sequentially apply a low-level or high-level second feedback signal corresponding to the first identifier to the second conductor 330 .

After outputting the first interrupt signal of the low level, the first function module 220 generates a second feedback signal of a low level or a high level corresponding to each of the first bit of the first identifier to the Mth bit of the first identifier. It may be sequentially applied to the second conductive wire 330 .

Hereinafter, the first bit of each of the first identifier to the N-th identifier may mean the most significant bit of the first identifier to the N-th identifier. In addition, the M-th bit of each of the first to N-th identifiers may mean the least significant bit of each of the first to N-th identifiers.

In addition, 0 of the bit values of the first to Nth identifiers may correspond to a low level signal, and 1 of the bit values of each of the first to Nth identifiers may correspond to a high level signal.

Taking the case in which the first identifier is 01 as an example, the first function module 220 provides a low-level second feedback signal corresponding to the first bit 0 and a high-level second feedback signal corresponding to the second bit 1 may be sequentially applied to the second conductor 330 .

Specifically, the first function module 220 may turn on the second switch 611 by outputting a low-level first identifier signal. Thereafter, the first function module 220 may turn off the second switch 611 by outputting a high level first identifier signal.

That is, the first function module 220 may sequentially output a low-level first identifier signal and a high-level first identifier signal corresponding to the first identifier 01 . Then, after the second feedback signal of the low level is applied to the second conductor 330 , the second feedback signal of the high level may be applied.

On the other hand, when the first function module 220 and the second function module 230 simultaneously output the first interrupt signal of the low level and the second interrupt signal of the low level, the second switch 611 and the fourth switch ( 621) may be turned on at the same time.

In this case, when the first function module 220 outputs a high level first identifier signal and the second feedback signal becomes a low level signal while the second switch 611 is turned off, the first function module 220 ) may maintain a state in which the second switch 611 is turned off.

In other words, when the output first identifier signal and the second feedback signal do not match, the first function module 220 stops outputting the first identifier signal corresponding to the first identifier, and the first identifier of the high level The state of outputting a signal can be maintained.

Meanwhile, after outputting the second interrupt signal, the second function module 230 generates a second feedback signal of a low level or a high level corresponding to each of the first bit of the second identifier to the Mth bit of the second identifier. It may be sequentially applied to the two conductors 330 .

Taking the case where the second identifier is 10 as an example, the second function module 230 provides a high-level second feedback signal corresponding to the first bit 1 and a low-level second feedback signal corresponding to the second bit 0. may be sequentially applied to the second conductor 330 .

Specifically, the second function module 230 may output the second identifier signal of the low level after outputting the second identifier signal of the high level. Then, after the high level second feedback signal is applied to the second conductor 330 , the low level second feedback signal may be applied.

On the other hand, when the first function module 220 and the second function module 230 simultaneously output the first interrupt signal of the low level and the second interrupt signal of the low level, the second switch 611 and the fourth switch ( 621) may be turned on at the same time.

In this case, when the second function module 230 outputs a high level second identifier signal and the second feedback signal becomes a low level signal while the second switch 611 is turned off, the second function module 230 ) may maintain a state in which the fourth switch 621 is turned off.

In other words, when the output second identifier signal and the second feedback signal do not match, the second function module 230 stops outputting the second identifier signal corresponding to the second identifier, and the high level second identifier The state of outputting a signal can be maintained.

For reference, each of the first function module 220 and the second function module 230 may sequentially output the first identifier signal and the second identifier signal according to a preset time interval (eg, 1 μs).

Meanwhile, the processor 240 may detect a second feedback signal of a high level or a low level sequentially applied to the second conductor 330 .

In addition, the processor 240 may identify any one of the first identifier and the second identifier based on the high-level or low-level second feedback signal sequentially applied to the second conductor 330 .

Accordingly, the processor 240 may execute a preset interrupt operation corresponding to the identified identifier.

For example, when the processor 240 identifies the first identifier, the processor 240 may execute a preset interrupt operation corresponding to the first identifier. That is, the processor 240 may execute a preset interrupt operation corresponding to the first function module 220 .

As another example, when the processor 240 identifies the second identifier, the processor 240 may execute a preset interrupt operation corresponding to the second identifier. That is, the processor 240 may execute a preset interrupt operation corresponding to the second function module 230 .

In addition, when the execution of the interrupt operation corresponding to the identified identifier is completed, the processor 240 determines the identifier corresponding to the identified one of the first function module 220 or the second function module 230 through the data bus 310 . An execution completion message can be provided to the function module.

Here, the execution completion message may be a message including information indicating that the execution of the interrupt operation is completed.

When the first function module 220 receives the execution completion message from the processor 240 , the first function module 220 may turn off the first switch 411 . That is, the first function module 220 may output a high level first interrupt signal.

When the second function module 230 receives the execution completion message from the processor 240 , the second function module 230 may turn off the third switch 421 . That is, the second function module 230 may output a high level second interrupt signal.

An example of the operation of the PLC system 200 when the first identifier is 00 and the second identifier is 10 will be described with reference to FIG. 7 .

The first function module 220 may output a low-level first identifier signal corresponding to the first bit (ie, 0) of the first identifier from t11 to t12. In addition, the first function module 220 may determine whether the first identifier signal output from t11 to t12 matches the second feedback signal.

Since the second feedback signal output from t11 to t12 is also a low level signal, the first function module 220 may determine that the first identifier signal output from t11 to t12 matches the second feedback signal.

Then, the first function module 220 may output a low-level first identifier signal corresponding to the second bit (ie, 0) of the first identifier from t12 to t13.

After outputting all of the first feedback signals corresponding to the first identifier from t11 to t13, the first function module 220 may output the first feedback signal having a high level from t13.

Meanwhile, from t11 to t12, the second function module 230 may output a high-level second identifier signal corresponding to the first bit (ie, 1) of the second identifier. In addition, the second function module 230 may determine whether the second identifier signal output from t11 to t12 matches the second feedback signal.

Since the second feedback signal output from t11 to t12 is a low level signal, the second function module 230 may determine that the second identifier signal output from t11 to t12 does not match the second feedback signal.

Then, the second function module 230 may stop outputting the second identifier signal (ie, 0) corresponding to the second identifier from t12 to t13 and maintain a state of outputting the high level second identifier signal. have.

Furthermore, the second function module 230 may output a high level second interrupt signal. Then, the third switch 421 may be turned off.

In addition, the second function module 230 may wait until the first feedback signal becomes a high level signal. Thereafter, when the first feedback signal becomes a high level signal, the second function module 230 may output a second interrupt signal of a low level to request an interrupt operation from the processor 240 again.

Furthermore, the processor 240 may identify the first identifier based on a high-level or low-level second feedback signal sequentially applied to the second conductive line 330 from t11 to t13.

That is, the processor 240 may detect a low-level second feedback signal from t11 to t12 and a low-level second feedback signal from t12 to t13. Accordingly, the processor 240 may identify the first identifier (ie, 00).

Then, the processor 240 may execute an interrupt operation corresponding to the first identifier. That is, the processor 240 may execute an interrupt operation corresponding to the first function module 220 .

When the execution of the interrupt operation corresponding to the first identifier is completed, the processor 240 may provide an execution completion message to the first function module 220 through the data bus 310 .

Then, the first function module 220 may output a high level first interrupt signal.

An example of the operation of the PLC system 200 when the first identifier is 0101 and the second identifier is 0010 will be described with reference to FIG. 8 .

The first function module 220 may output a low-level first identifier signal corresponding to the first bit (ie, 0) of the first identifier from t21 to t22.

Since the second feedback signal from t21 to t22 is a low level signal, the first function module 220 may determine that the first identifier signal output from t21 to t22 matches the second feedback signal.

Accordingly, the first function module 220 may output a high-level first identifier signal corresponding to the second bit (ie, 1) of the first identifier from t22 to t23.

Since the second feedback signal from t22 to t23 is a low-level signal, the first function module 220 determines that the first identifier signal corresponding to the second bit of the first identifier from t22 to t23 does not match the second feedback signal. can judge

Then, the first function module 220 may stop outputting the first identifier signal corresponding to the first identifier after t23. In addition, the first function module 220 may output a high level first identifier signal from t23.

Furthermore, the first function module 220 may output a high level first interrupt signal. Then, the first switch may be turned off.

Meanwhile, the second function module 230 may output a low-level second identifier signal corresponding to the first bit (ie, 0) of the second identifier.

Since the second feedback signal from t21 to t22 is a low level signal, the second function module 230 may determine that the second identifier signal output from t21 to t22 matches the second feedback signal.

Accordingly, the second function module 230 may output a low-level second identifier signal corresponding to the second bit (ie, 0) of the second identifier from t22 to t23.

Since the second feedback signal from t22 to t23 is a low level signal, the second function module 230 may determine that the second identifier signal output from t22 to t23 matches the second feedback signal.

Accordingly, the second function module 230 may output a high-level second identifier signal corresponding to the third bit (ie, 1) of the second identifier from t23 to t24.

Since the second feedback signal from t23 to t24 is a high level signal, the second function module 230 may determine that the second identifier signal output from t23 to t24 matches the second feedback signal.

Accordingly, the second function module 230 may output a low-level second identifier signal corresponding to the fourth bit (ie, 0) of the second identifier from t24 to t25.

After outputting all of the second feedback signals corresponding to the second identifier from t21 to t25, the second function module 230 may output a second feedback signal having a high level from t25.

Furthermore, the processor 240 may identify the first identifier based on the high-level or low-level second feedback signal sequentially applied to the second conductor 330 from t21 to t26.

Specifically, the processor 240 may sequentially detect a low-level second feedback signal, a low-level second feedback signal, a high-level second feedback signal, and a low-level second feedback signal from t21 to t26. have.

Accordingly, the processor 240 may identify the second identifier (ie, 0010) based on the sequentially sensed second feedback signal.

Then, the processor 240 may execute an interrupt operation corresponding to the second identifier. That is, the processor 240 may execute an interrupt operation corresponding to the second function module 230 .

When the execution of the interrupt operation corresponding to the second identifier is completed, the processor 240 may provide an execution completion message to the second function module 230 through the data bus 310 .

Then, the second function module 230 may output a high level second interrupt signal.

Hereinafter, an interrupt operation processing method performed by the first function module 220 to the Nth function module 340 will be described with reference to FIGS. 9 and 10 .

9 is a flowchart illustrating an interrupt operation processing method performed by the first function module of FIG. 2 . 10 is a flowchart specifically explaining S940 of FIG. 9 .

Hereinafter, the interrupt operation processing method performed by the first function module may be performed by each of the second function module 230 to the Nth function module 340 through the same process and steps. Therefore, hereinafter, for convenience of description, a method of processing an interrupt operation will be described focusing on the first function module 220 .

The first function module 220 may determine whether a preset first interrupt condition is satisfied (S910).

For example, the first function module 220 may be an analog input module that receives a voltage value from an external device, and the preset first interrupt condition may be a condition in which the voltage value is 0.1 mV or less.

Then, when the voltage value input from the external device is 0.1 mV or less, the first function module 220 may determine that the first interrupt condition is satisfied. Conversely, when the voltage value input from the external device exceeds 0.1 mV, the first function module 220 may determine that the first interrupt condition is not satisfied.

If the first interrupt condition is not satisfied, the first function module 220 may perform step S910 again.

When the first interrupt condition is satisfied, the first function module 220 may determine whether the first feedback signal is a high level signal (S920).

Here, the first function module 220 may determine whether another function module has output an interrupt signal by determining whether the first feedback signal is a high level signal.

When the first feedback signal is a low-level signal, the first function module 220 may perform step S920 again.

When the first feedback signal is a high level signal, the first function module 220 may turn on the first switch 411 ( S930 ).

Specifically, the first function module 220 may output a first interrupt signal of a low level. Then, the first switch 411 may be turned on. Accordingly, a low level signal may be applied to the first conductive line 320 .

After performing step S930 , the first function module 220 may sequentially apply a low-level signal or a high-level signal corresponding to the first identifier to the second conductor 330 ( S940 ).

Specifically, the first function module 220 may sequentially output a first identifier signal corresponding to the first identifier to turn on or turn off the second switch 611 .

When the second switch 611 is turned on, a second feedback signal of a low level may be applied to the second conductive line 330 . In addition, when the second switch 611 is turned off, a second feedback signal of a high level may be applied to the second conductive wire 330 .

Referring to FIG. 10 , step S940 will be described in more detail.

After performing step S930, the first function module 220 may output a first identifier signal corresponding to the first bit of the first identifier (S1010).

Specifically, when the first bit of the first identifier is 1, the first function module 220 may output a high-level first identifier signal. And, when the first bit of the first identifier is 0, the first function module 220 may output a low-level first identifier signal.

After performing step S1010, the first function module 220 may determine whether the first identifier signal and the second feedback signal match.

When the first identifier signal corresponding to the first bit of the first identifier and the second feedback signal do not match, the first function module 220 may perform step S920 .

Specifically, when the first identifier signal corresponding to the first bit of the first identifier and the second feedback signal do not match, the first function module 220 may maintain a state of outputting the high-level first identifier signal. have. That is, the first function module 220 may maintain a state in which the second switch 611 is turned off. Thereafter, the first function module 220 may perform step S920 .

Meanwhile, when the first identifier signal corresponding to the first bit of the first identifier and the second feedback signal match, the first function module 220 outputs the first identifier signal corresponding to the second bit of the first identifier It can be done (S1030).

Specifically, when the second bit of the first identifier is 1, the first function module 220 may output a high-level first identifier signal. And, when the second bit of the first identifier is 0, the first function module 220 may output the first identifier signal of a low level.

After performing step S1030, the first function module 220 may determine whether the first identifier signal corresponding to the second bit of the first identifier matches the second feedback signal (S1040).

When the first identifier signal corresponding to the second bit of the first identifier and the second feedback signal do not match, the first function module 220 may maintain a state of outputting the high level first identifier signal. That is, the first function module 220 may maintain a state in which the second switch 611 is turned off. Thereafter, the first function module 220 may perform step S920 .

Meanwhile, when the first identifier signal corresponding to the second bit of the first identifier matches the second feedback signal, the first function module 220 may perform step 950 .

Although the case where the first identifier consists of two bits has been described in FIG. 10, this is only an example, and in the present invention, even when the first identifier consists of one or less or three or more bits, the first function module 220 is shown in FIG. It can operate in the same way as the flowchart of 10.

Referring back to FIG. 9 , after performing step S940 , the first function module 220 may determine whether an execution completion message is received from the processor 240 ( S950 ).

When the first function module 220 does not receive the execution completion message from the processor 240 , the first function module 220 may perform step S950 again.

When the first function module 220 receives the execution completion message from the processor 240 , the first function module 220 may turn off the first switch 411 ( S960 ).

Specifically, after receiving the execution completion message from the processor 240 , the first function module 220 may turn off the first switch 411 by outputting a high level first interrupt signal.

Hereinafter, an interrupt operation processing method performed by the processor 240 will be described with reference to FIG. 11 .

11 is a view for explaining a method of processing an interrupt operation performed by the processor of FIG. 2 .

The processor 240 may determine whether the first feedback signal (ie, the signal applied to the first conductive line 320 ) is a low level signal ( S1110 ).

Specifically, the processor 240 may determine whether a function module requesting an interrupt operation exists by determining whether the first feedback signal is a low-level signal.

When the first feedback signal is a high level signal, the processor 240 may perform step S1110 again.

That is, when the first feedback signal is a high level signal, the processor 240 may determine that the function module requesting the interrupt operation does not exist. Then, the processor 240 may perform step S1110 again.

When the first feedback signal is a low-level signal, the processor 240 may determine whether reception of the second feedback signal has been completed ( S1120 ).

Specifically, the processor 240 may sequentially receive the second feedback signal corresponding to the preset identifier (the first identifier or the second identifier) of the function module that has requested the interrupt operation.

The processor 240 may determine that the reception of the second feedback signal is completed when the second feedback signal is sequentially received by the bit length of the preset identifier.

For example, when the bit length of the preset identifier is 4, the processor 240 receives the first feedback signal of the low level, and then the time required for the function module to apply the second feedback signal of the bit length 4 ( For example, it can wait as long as 4 μs).

When the reception of the second feedback signal is not completed, the processor 240 may perform step S1120 again.

When the reception of the second feedback signal is completed, the processor 240 may identify the identifier based on the sequentially received second feedback signal ( S1130 ).

Specifically, the processor 240 may identify any one of the first identifier and the second identifier based on the sequentially received second feedback signal.

After performing step S1130, the processor 240 may execute an interrupt operation corresponding to the identifier (S1140).

Specifically, when the processor 240 identifies the first identifier, the processor 240 may execute an interrupt operation corresponding to the first identifier. That is, the processor 240 may execute an interrupt operation corresponding to the first function module 220 .

When the processor 240 identifies the second identifier, the processor 240 may execute an interrupt operation corresponding to the second identifier. That is, the processor 240 may execute an interrupt operation corresponding to the second function module 230 .

After performing step S1140, the processor 240 may provide an execution completion message to the function module corresponding to the identifier (S1150).

Specifically, when the execution of the interrupt operation is completed, the processor 240 may provide an execution completion message to the function module corresponding to the identifier through the data bus 310 .

For example, when the processor 240 completes the execution of the interrupt operation corresponding to the first identifier, it may provide an execution completion message to the first function module 220 . In addition, when the processor 240 completes the execution of the interrupt operation corresponding to the second identifier, it may provide an execution completion message to the second function module 230 .

As described above, the PLC system 200 according to an embodiment of the present invention provides a second feedback signal corresponding to the identifier of the function module requesting the interrupt operation to the processor 240 to find the function module requesting the interrupt operation. The process can be omitted. Accordingly, the time for which the processor 240 stops scanning may be reduced, and processing performance of the entire PLC system may be increased.

In addition, the PLC system according to an embodiment of the present invention provides a second feedback signal corresponding to the identifier of the function module requesting the interrupt operation to the processor 240 so that even if the number of function modules increases, after receiving the interrupt operation request The time required to perform the interrupt operation can be kept constant. Accordingly, even if the number of function modules increases, the interrupt operation of the function module can be efficiently processed.

For those of ordinary skill in the art to which the present invention pertains, various substitutions, modifications and changes are possible within the scope of the present invention without departing from the technical spirit of the present invention. is not limited by

200: PLC system
210: base module
220: first function module
230: second function module
240: processor

Claims (12)

a first function module and a second function module;
a base module receiving a first feedback signal related to an interrupt operation from any one of the first function module and the second function module; and
A processor receiving the first feedback signal from the base module and identifying a function module that provided the first feedback signal from among the first function module and the second function module,
The first function module and the second function module detect whether the first feedback signal is provided to each other,
The base module includes a first conductive wire and a second conductive wire, and the first functional module, the second functional module, and the processor are connected to the first conductive wire and the second conductive wire,
When a preset first interrupt condition is satisfied, the first function module turns on a first switch connected to the first conductor to apply a first feedback signal of a low level to the first conductor, and is connected to the second conductor turning on or off a second switch to sequentially apply a second feedback signal of a low level or a high level corresponding to the first identifier to the second conductor;
PLC system.
delete According to claim 1,
The second function module is configured to determine whether a high-level first feedback signal is applied to the first conductor when a preset second interrupt condition is satisfied.
PLC system.
4. The method of claim 3,
When a high-level first feedback signal is applied to the first conductor, the second function module turns on a third switch connected to the first conductor to apply a low-level first feedback signal to the first conductor; , sequentially applying a high level or low level second feedback signal corresponding to a second identifier to the second conductor by turning on or off a fourth switch connected to the second conductor
PLC system.
5. The method of claim 4,
The processor is configured to, when a first feedback signal of a low level is applied to the first conductor, the first identifier and the second feedback signal based on a second feedback signal of a high level or a low level sequentially applied to the second conductor. Identifies any one of the identifiers and executes a preset interrupt operation corresponding to the identified identifier
PLC system.
5. The method of claim 4,
When at least one of the first switch and the third switch is turned on, a first feedback signal of a low level is applied to the first conductor;
When the first switch and the third switch are turned off, a first feedback signal of a high level is applied to the first conductive wire.
PLC system.
5. The method of claim 4,
When the first function module and the second function module simultaneously output a first interrupt signal of a low level and a second interrupt signal of a low level, the second switch and the fourth switch are simultaneously turned on
PLC system.
5. The method of claim 4,
Each of the first identifier and the second identifier consists of M bits,
After turning on the first switch, the first function module turns on or off the second switch to provide a second feedback of a low level or a high level corresponding to each of the first bit to the Mth bit of the first identifier. sequentially applying a signal to the second conductor
PLC system.
9. The method of claim 8,
After turning on the third switch, the second function module turns on or off the fourth switch to obtain a low-level signal or a high-level second signal corresponding to each of the first bit to the M-th bit of the second identifier. Sequential application of feedback signals
PLC system.
delete 7. The method of claim 6,
The first function module is configured to maintain a state in which the second switch is turned off when a second feedback signal of a low level is applied to the second conductor in a state in which the second switch is turned off.
PLC system.
6. The method of claim 5,
The base module further includes a data bus connected to the first function module, the second function module, and the processor,
When the execution of the interrupt operation corresponding to the identified identifier is completed, the processor provides an execution completion message to a function module corresponding to the identified identifier among the first function module or the second function module through the data bus doing
PLC system.

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