JPH09128013A - Programmable controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform the self-check of a sequence program by executing desk simulation including the operation of a machine to be controlled or static simulation to be executed by stopping a power source for a machine only by one programmable controller. SOLUTION: A 2nd sequence program 33 inputs an ON/OFF output signal controlled by a 1st sequence program 32 to be debugged from an output image memory 21 (or a false input image memory 26 equivalent to the memory 21) and executes operation equivalent to machine operation to control an ON/OFF signal stored in a false output image memory 27. The 1st sequence program 32 inputs and processes a synthetic ON/OFF signal obtained by logically synthesizing the contents of the memory 27 and the contents of an input image memory 20 and storing the synthetic signal in a synthetic input image memory 28 as a control input.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a programmable controller which responds to ON / OFF states of a large number of input signals from the outside and performs ON / OFF control of a large number of output signals to a control target by programmable electronic means ( The present invention relates to a PLC), and more particularly to a PLC having a function of executing simulation of a sequence program stored in an actual machine on the actual machine.

[0002]

_2. Description of the Related Art FIG. 5 shows, for example, "Handy Simulation Unit FX2-32MR-S" manufactured by Mitsubishi Electric Corporation.
2 is a diagram showing an overall configuration when a sequence program is simulated by "ET". In the figure, 1
Is a first PLC provided with an input terminal block 2 and an output terminal block 3, and a first sequence program 10 (FIG. 6) to be simulated is stored in this first PLC 1.

Reference numeral 1a is a second PLC having an input terminal block 2a and an output terminal block 3a. The PLC 1a has a second PLC that simulates the operation of a machine controlled by the first PLC 1.
The sequence program 10a (FIG. 6) is stored.

Reference numeral 4 is a simulation switch connected to the first PLC 1, and corresponds to a manual operation switch (not shown) provided on the machine controlled by the first PLC 1. One end of each of these simulation switches 4 is commonly connected to the common terminal C of the input terminal block 2, and the other ends thereof are respectively input terminals TX0, TX1, TX2, ...
It is connected to TXn.

When a ready-made set product is used as the simulation switch 4, the first PLC 1
Input terminals TX0, TX1, TX2, ... TX
The simulation switch 4 may be connected to n. However, if a simulation switch is connected to an input terminal to which a sensor switch such as a limit switch, photoelectric switch, or proximity switch provided on the machine to be controlled should be connected, these are used to eliminate unnecessary input signals. It is necessary to turn off the simulation switch.

Reference numeral 5 is a contact of a large number of output relays built in the first PLC 1, one end of each contact 5 is commonly connected to a common terminal C, and the other end is an output terminal T respectively.
Second P through Y0, TY1, TY2, ... TYn
LC1a input terminals TX0, TX1, TX2, ... T
It is connected to Xn.

Reference numeral 5a is a contact of a large number of output relays built in the second PLC 1a, one end of each contact 5a is commonly connected to a common terminal C, and the other end is an output terminal TY0, TY.
1, TY2, ... TYn through the first PL
It is connected to the input terminals TX0, TX1, TX2 ... TXn of C1.

However, in the input terminal block 2, the simulation switches 4 and 4 are connected to the input terminals TX0, TX1, ... To which the manual operation switches provided in the controlled machine are connected. Input terminal T
It is not necessary to connect the contacts 5a to X0, TX1 ,.

If all the outputs of the second PLC 1a are input to all the input terminals TX0, TX1, ... Of the first PLC 1 ...
Even if the second PLC 1a is connected to TXn, the second
In the sequence program 10a, the unnecessary control output corresponding to the manual operation switch of the machine does not occur, so there is no practical problem.

The operation and operation of the conventional technique will be described below with reference to FIG. FIG. 6 shows the first PLC1 shown in FIG.
And a sequence diagram for explaining the overall operation and operation of the second PLC 1a. In FIG. 6, 10 is a relay ladder diagram representing the contents of the first sequence program (that is, the sequence program to be simulated) programmed in the first PLC 1. 10a is the second PL
The contents of the second sequence program (that is, the sequence program corresponding to the simulated operation of the machine to be controlled) programmed in C1a is expressed by a relay ladder diagram.

First, as the operation of the first sequence program, of the simulation switches 4 in FIG. 5, the switch 4 connected to the input terminal TX0 of the input terminal block 2 is turned on to turn on the normally open contact in the relay ladder diagram. When X0C is turned on, the normally closed contact X10C of the right limit switch is in the closed state, so that the output relay Y0 operates. After that, even if the simulation switch 4 connected to the terminal TX0 is turned off, the operation of the output relay Y0 continues due to the closed circuit of the self-holding normally open contact Y0C.

If the output relay Y0 is used, for example, for the right action action of the truck driving motor, the normally closed contact X10C of the right limit switch (not shown) is opened and the output relay Y0 becomes inoperative. It is intended to stop the rightward movement.

Next, the second sequence program 10a
As the operation of, the output Y0S from the output terminal block 3 in the first PLC 1 shown in FIG. 5 is input as the input X0S to the input terminal block 2a in the second PLC 1a and is normally opened in the relay ladder diagram (10a). Turn on contact X0C. As a result, the timer T0 in the second PLC 1a is driven, and the normally open contact T0C is closed after the set time K10 (for example, 10 seconds).

Therefore, the output relay Y10 operates and the output Y10S from the output terminal TY10 of the output terminal block 3a is
The input terminal TX1 of the input terminal block 2 in the first PLC 1
0 is input as input X10S and relay ladder diagram (1
The normally closed contact X10C in 0) is opened. In this way, the second sequence program 10a
This is a simulation of the operation of the machine to be controlled by the PLC 1, and the timer T0 is set to correspond to the rightward operation time of the actuator.

The first sequence program 10
Shows only a small part for machine control, and is generally complicated based on a complex combination of a large number of inputs and outputs and a safe operation procedure. On the other hand, the second sequence program 10a directly expresses the response of the sensor accompanying the driving of various actuators, and it is common to program a large number of simple timer circuits as shown in FIG. is there.

In the case of a static output load such as an indicator lamp provided on the machine to be controlled, the first PLC 1
Since the operation can be confirmed by the output display LED provided in, it is not necessary to create a simulation program.

[0017]

As described above, the conventional PLC performs the equivalent simulation of the sequence program at the final stage of the development of the sequence program to be stored, even if there is no machine to be sequence controlled. You can verify the operation of.

However, in the conventional case, when simulating a sequence program, there are two PLCs that store a sequence program that is a simulation target and two PLCs that store a sequence program that simulates the operation of a machine that is a control target by the sequence program. There are some drawbacks that are needed.

In order to solve the above-mentioned problems, if a PLC having a large number of input / output points is used, the input / output leads for simulation are connected to the extra input / output terminal block portion, so that the developed sequence program It is also possible to perform simulation with one PLC that stores a sequence program that also simulates the operation, but in this case, as the number of input / output points increases, the input / output terminal block becomes larger and the PLC becomes larger, leading to cost increase. In addition, there is a problem that it takes time and effort to wire a simulation lead wire between the input and output terminals.

The first object of the present invention is to put the PL into practical use.
A PLC capable of performing a desk-top simulation of a sequence program assuming a machine operation to be controlled without connecting a simulation wiring between the input and output terminals by connecting a simulation switch to the input terminal of C. Is.

A second object of the present invention is to provide a power source for a machine even after the PLC is already installed in the machine to be controlled and the leads of the input / output device are wired to each terminal block. In other words, by stopping the power source of the motor, the hydraulic pressure of the hydraulic cylinder, or the pressure source of the pneumatic equipment, the PLC capable of performing the operation simulation of the sequence program while the machine is stationary is obtained.

[0022]

According to a first aspect of the present invention, there is provided a programmable controller which simulates an operation of a first sequence program which is an operation verification target and a device which is a control target of the first sequence program. A program memory storing the second sequence program, a control processing unit that performs sequence control processing based on these sequence programs, a processing result memory that stores the processing result of the first sequence program, and this processing result And a pseudo output memory for storing a processing result of the second sequence program, wherein the control processing unit fetches the content of the pseudo output memory as a control input into the first sequence program to perform a program processing and an operation verification. Is to do.

A programmable controller according to a second aspect of the present invention stores a first sequence program to be an operation verification target and a second sequence program simulating the operation of a device to be controlled by the first sequence program. Program memory, a control processing unit that performs sequence control processing based on these sequence programs, a processing result memory that stores processing results of the first sequence program, and the second sequence program that captures the processing results. A pseudo output memory for storing the processing result of the above, and a logical combination means for logically combining the processing result stored in the pseudo output memory and the input signal taken in by the first sequence program into a combined signal, The control processing unit receives the composite signal as a control input and then outputs the first signal. The program processing incorporated into the sequence program, and performs operation verification.

A programmable controller according to a third aspect of the present invention is the programmable controller according to the second aspect, wherein the logic coupling means receives a processing result stored in the pseudo output memory and an input signal fetched into the first sequence program. Is to be ORed.

According to a fourth aspect of the present invention, there is provided a programmable controller according to the first or second aspect, in which the stored contents have a content equivalent to that of the processing result memory and a storage name different from that of the processing result memory. A pseudo input memory for writing is provided, and the contents of this pseudo input memory are taken into the second sequence program.

A programmable controller according to a fifth aspect of the present invention is the programmable controller according to the first or second aspect, further comprising program control means for selecting execution / non-execution of the second sequence program.

A programmable controller according to a sixth aspect of the present invention is the programmable controller according to the second or fifth aspect, in which the input signal and the processing result of the second sequence program are used as control inputs to be incorporated in the first sequence program. The control processing unit takes in the input signal, which is provided with a parameter memory in which information on whether to select the content of the pseudo output memory or a synthetic signal obtained by logically adding the contents of a certain pseudo output memory is set in correspondence with the number of the input signal. Each time, the information in the parameter memory is read and the control input for the first sequence program is selected.

A programmable controller according to a seventh aspect of the present invention is the programmable controller according to the second or fifth aspect, in which the logical combination is omitted when the second sequence program is not executed and a large number of input signals are input to the first sequence. It is provided with a program selecting means to be treated as a control input for the program.

[0029]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. Next, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of the PLC according to this embodiment. In the figure, 15 is a PLC in the present embodiment, 16 is a CPU as a control processing unit that performs sequence control processing, sequence program simulation processing, etc. according to data and programs stored in each memory described later, and 17 is a CP.
A system memory that stores a system program that is a processing procedure of U16, and 18 is an input interface that connects a large number of input switches 19 provided outside the PLC 15 to the CPU 16. This input interface 18 is
In addition to converting the voltage level of the input signal and performing optical isolation, an ON / OFF input signal from the input switch 19 is supplied to the CPU 16 in units of 8 points or 6 points by sequentially selecting a plurality of data selectors not shown.

Reference numeral 20 denotes an input switch 1 via the CPU 16.
9 is an input image memory in which ON / OFF input signals of 9 are stored. However, the input image memory 20 is a CPU
This is not necessarily required in a PLC of the type in which the ON / OFF input signal of the input switch 19 required for control is directly input from the input interface 18 each time it is required.

Reference numeral 21 denotes an output image memory as a processing result memory. The output image memory 21 is the first sequence program 32 (FIG. 3) stored in the program memory 22 and the input image memory 20 (or the input interface). Based on (ON / OFF signal of the input switch 19 from 18), an ON / OFF output signal which is an output command controlled and calculated by the CPU 16 is stored. It should be noted that the CPU 16 generates an output command while also referring to the ON / OFF output signal in the output image memory 21 during the control calculation process.

23 is an ON / OF in units of 8 points or 16 points
It is a plurality of output latch memories that handle the F output signal.
The ON / OFF output signals stored in are sequentially selected and stored. The storage timing includes a direct method, which is performed each time the content of the output image memory 21 is updated, and a refresh method, which is cyclically performed when a series of operations of the CPU 16 is completed.

Reference numeral 24 is an output interface. The output interface 24 is directly connected to the output latch memory 23 to perform conversion of the voltage level of the output signal and optical isolation. In the output interface 24, a large number of output loads 25 such as solenoid valves and pilot lamps provided outside the PLC 15 are provided.
It is connected in units of points or 16 points. Reference numeral 26 is a pseudo input image memory.
6, the contents of the output image memory 21 (ON / OFF
Output signal) is transferred to the output latch memory 23,
The same ON / OFF output signal is transferred. Therefore, since the storage contents are substantially the same as those of the output image memory 21, the pseudo input image memory 26 is not always necessary.

However, the ON / OFF output signal stored in the output image memory 21 is referred to as a series of numbers with the output symbol Y such as Y0, Y1, Y2, ... On the sequence program. On the other hand, since the ON / OFF output signal stored in the pseudo input image memory 26 is treated as an ON / OFF input signal by the user, a series of numbers with an input symbol χ such as χ0, χ1, χ2 ... And is easy for the user to identify. Even in this case, there is practically no difference between the two names.

27 is a pseudo output image memory, and this pseudo output image memory 27 is a pseudo input image 26.
The control output based on the contents of (or the output image memory 21) and the second sequence program 33 (FIG. 3) in the program memory 22 is stored. Then, in the pseudo output image memory 27, for example, y0, y1, y2
ON / O of serial number with output symbol y
The FF signal is stored.

28 is a composite input image memory, and this composite input image memory 28 is the input image memory 2
0 content (or ON / OF of input interface 18)
F signal) and the contents of the pseudo output image memory 27 are C
The combined ON / OFF signal logically combined by the logical sum means which is a software function of the PU 16 is stored. The connection logic is as described later. Reference numeral 29 denotes various internal device memories such as a timer, a counter, a data register, and an auxiliary relay provided inside the PLC 15, which can be freely used in the first and second sequence programs 32 and 33.

Reference numeral 30 denotes a tool interface. The tool interface 30 transfers a sequence program created by a program creation tool (not shown) to the program memory 22 and artificially changes the settings of various image memories and device memory 29. It is an interface to tools for displaying and displaying on a monitor.

Reference numeral 31 is a parameter memory used in the second embodiment described later. The various memories and interfaces described above are connected to the CPU 16 by a bus and are configured to communicate with each other via the CPU 16.

Next, a detailed description of the operation and operation of the present embodiment will be given with reference to FIG. FIG. 2 is a block diagram for explaining the action and operation of the PLC 15 configured as shown in FIG. In FIG. 1 and FIG. 2, turning on / off a large number of input switches 19 connected to the outside of the PLC 15.
The FF input signal is input to the input interface 18 and the CPU 16.
Is taken into the input image memory 20 via. CPU
Reference numeral 16 denotes an ON / OFF output signal of the output image memory 21 based on the content of the composite input image memory 28, the content of the output image memory 21, and the first sequence program 32 (FIG. 3) in the program memory 22. The content is controlled, that is, the ON / OFF state represented by 1,0 is updated. Then, the control result is output to a large number of output loads 25 via the output latch memory 23 and the output interface 24, and the output loads 25 are ON / OFF controlled.

On the other hand, the contents of the output image memory 21 (or the pseudo input image memory 26 having contents equivalent thereto), the contents of the pseudo output image memory 27, and the second sequence program 33 in the program memory 22.
Based on (FIG. 3), the CPU 16 controls the ON / OFF signal stored in the pseudo output image memory 27.

The contents of the pseudo output image memory 27 and the contents of the input image memory 20 (or ON / OFF signal of the input interface 18) are logically combined and stored in the composite input image memory 28. It serves as a control input for the first sequence program 32 (FIG. 3).

Therefore, if either the ON / OFF signal in the input image memory 20 or the pseudo output image memory 27 is ON, the signal of the combined input image memory 28 corresponding thereto is also turned ON.

FIG. 3 shows an example of the first and second sequence programs 32 and 33 in FIG.
The operation of the first sequence program 32 in the case of performing a desktop simulation with the program shown in FIG. 3 will be described. In this case, among the signal input devices connected to the input interface 18 of the PLC 15, all the manually operated input devices except for the sensor input in the machine to be controlled are replaced by simulation switches. Are connected.

The output load 25 outside the PLC 15 and the input switch 19 themselves are not connected. Further, when the simulation switches are connected to all the input terminals of the PLC 15, it is assumed that all the simulation switches connected to the input terminals to which the sensor input switch should be connected are turned off.

In FIG. 3, 32 is the program memory 22.
The content of the first sequence program in the above is expressed by a relay ladder diagram, and in the figure, X0C is a conductive state when the input X0 of the simulation switch is turned on and the signal X0S in the composite image memory 28 is turned on. Open contacts, Y0 and Y0C are coils and normally open contacts that operate when the signal Y0S in the output image memory 21 is ON, and X10C is a normally closed contact that opens when the signal X10S in the composite input image memory 28 is ON. And
This relay ladder diagram has the same configuration as that of FIG.

33 is a relay ladder diagram showing the contents of the second sequence program in the program memory 22. In the diagram, M9000 is a normally closed circuit which operates in response to the operation of the special auxiliary relay in the internal device memory 29. The contact, CJ-P0 is a coil for jump command which makes the program up to the step of label P0 not executed when the normally closed contact M9000 is driven, and χ0C is the pseudo input signal χ0S in the pseudo input image memory 26. Normally open contacts that are closed at times, T0 and T0C are the device memory 2 respectively.
9 is a coil of the timer and a normally open contact, and this normally open contact T0C is a set value K10 after the coil T0 is driven.
The circuit is closed (for example, 10 seconds).

Y10 is an output coil that operates when the pseudo output signal y10S in the pseudo output image memory 27 is ON, and at this time, the input signal X10S in the composite input image memory 28 is also ON, and the first sequence is performed. The normally closed contact X10C in the program 32 opens.

Therefore, the operation of these sequence programs is exactly the same as that shown in FIG. However,
Input X0S and output Y10S of the second PLC 1a (FIG. 5)
Instead of, the PLC 15 uses the pseudo input signal χ0S and the pseudo output signal y10S.

In the sequence of FIG. 3, the special auxiliary relay M9000 is forcibly turned on by using a program creation tool (not shown) when performing the simulation operation.
Need to be done. As a result, the jump function of CJ-P0 is canceled and the second sequence program 33 becomes effective. On the contrary, if the special auxiliary relay M9000 is inoperative and the normally closed contact M9000 is closed, CJ-P0
The second sequence program 33 by the jump function of
Is not executed.

This is for invalidating the second sequence program 33 in the practical operation stage of the PLC 15, but actually, in the practical operation stage, all the second sequence program 33 is deleted. You can do it. Furthermore, when the special auxiliary relay M9000 is inoperative (that is, when simulation is not performed), the contents of the input image memory 20 are combined and input without combining the input image memory 20 and the pseudo output image memory 27. By handling the contents of the image memory 28, C
The load for the PU16 composition processing is also reduced.

The special auxiliary relay means a large number of general-purpose auxiliary relays in the internal device memory 29, M.
0, M1, M2, ... Compared with 0, M1, M2, etc., the point that the operation is defined in advance in the system memory 17, for example, ON / OFF corresponding to the RUN / STOP instruction of PLC
M8000, which operates when a PLC error occurs
Although it is a number such as 067 that differs depending on the manufacturer of the PLC, a similar technique is widely used. Here, it is assumed that M9000 is newly added for the present invention.

Embodiment 2 The above-described first embodiment is PL
It has been described that the simulation switch is connected to the input of C15, and all the inputs other than the input corresponding to the manual operation switch of the machine are turned off to perform the desktop simulation. In the present embodiment, the CPU 16 also constitutes program selection means and program control means.

On the other hand, when the PLC 15 is already incorporated in the machine to be controlled and each lead wire is wired to the input / output terminals, and the stationary operation simulation is performed with the power source of the machine stopped, The simulation switch is unnecessary, and the manual operation switch of the actual machine can be used as it is. However, of the sensor input switches such as limit switches, photoelectric switches, proximity switches, etc. that are interlocked with the operation of the machine, when the sensor input switch that is currently in the ON state is connected to the input of PLC 15, the input of this sensor input switch It is necessary to perform processing to invalidate.

In this case, if the number of sensor input switches in the ON state is small, the sensor input switches may be removed from the wiring of the input terminal, but if a large number of unspecified sensor input switches are in the ON state, the handling becomes poor. . Further, the input terminal block for receiving the inputs of these sensor input switches can be removed to invalidate the switch inputs all at once, but this is also not the preferred processing method because it will damage the equipment.

The present embodiment has improved these problems, and the parameter memory 31 in the PLC 15 shown in FIG. 1 is used. In the parameter memory 31, a program creation tool (not shown) is used to store number data indicating which number range is input by the manual operation system. As a promise in this case, for example, the input switch of the manual operation system uses the young number group for the input number, and the old number group for the input of the sensor system.

FIG. 4 shows such a parameter memory 31.
9 is a flowchart of a combining process using. According to this flowchart, first, the operating state of the special auxiliary relay M9000 in the internal device memory 29, which is in the operating state when performing the simulation operation, is determined (step 40). And the special auxiliary relay M9
When 000 is inoperative, the contents of the input image memory 20 are directly transferred to the composite image memory 28 (step 4).
1).

Actually, the content of the input image memory 20 is ignored, ignoring the content of the composite input image memory 28.
If the ON / OFF input signal of the input interface 18 is used, the above transfer processing is unnecessary. In step 40,
If it is determined that the special auxiliary relay M9000 is in operation, the input number that is the target of the combining process is set (step 42). At the start of the operation of the first sequence program 32 as well, the input number is, for example, X0.

It is determined whether the input number set in step 42 belongs to the weak number group set in the parameter memory 31 (step 43). When the set input number is a weak group, the logical sum of the input image memory 20 and the pseudo output image memory 27 is transferred to the composite input image memory 28 (step 44). The content of the composite input image memory 28 serves as a control input for the first sequence program 32. For the purposes of the second embodiment, the contents of the input image memory 20 may simply be transferred to the composite input image memory 28.

After the combined ON / OFF input signal obtained by the logical sum combination is stored in the combined input image memory 28, the same operation of adding 1 to the set input number is repeated (step 4).
5). This is step 43 after adding 1 to the setting input number.
If it is determined to be an old number by, the setting input number is PLC15.
It is determined whether or not the maximum input number set in (4) is exceeded (step 46). If it is determined in this determination step that the maximum input number is not exceeded, the pseudo output image memory 2
7 is transferred to the composite input image memory 28, and the first
It is used as a control input for the sequence program 32 (step 47).

Actually, even if this transfer processing is not performed,
For the input of the old number group, the CPU 16 may ignore the contents of the composite input image memory 28 and read the contents of the pseudo output image memory 27.

As described above, step 41 is the processing step when the simulation operation is not performed, step 44 is the processing step for the weak group input (ie manual operation system input), and step 47 is the old group input (ie sensor). These are the processing steps for system input), and these processing steps are executed according to the procedure determined by the system program in the system memory 17 (FIG. 1).

When the input numbers of the parameter memory 31 are set so that all the inputs of the PLC 15 are treated as a weak group, all the inputs are subjected to the logical sum synthesis processing. This corresponds to the embodiment. Further, regarding the grouping of the input, it is possible to set the parameters such that the input numbers may be mixed with each other even if the same two groups are used instead of just the two groups of weak number / old number.

As described above, for the old group input of the sensor input system, the contents of the input image memory 20 are ignored, and the output signal of the pseudo output image memory 27 substitutes for the input of the PLC 15. The simulation can be executed even if the sensor input in the ON state is connected to the PLC.

However, when the simulation control is completed,
When performing the practical operation of the PLC (that is, when the special auxiliary relay M9000 described above is not operated), the contents of the input image memory 20, that is, the input interface 1 is processed in step 41.
The synthesizing process is canceled so that the ON / OFF signal itself input from 8 is valid.

In the above description, the PLC based on the relay ladder language has been described, but the same applies to PLCs in various language formats such as a step progress programming language (SFC language) and a flow chart type language as other languages. In any case, it is important for the user that the first sequence program for actual machine control and the second sequence program for simulation can be programmed in the same language.

The synthetic input image memory 28 is theoretical and does not necessarily require a special memory as hardware, and the CPU 16 may perform the synthetic processing each time. In addition, the input image memory 20
The same purpose can be achieved by performing a selection process of selecting the contents of the above or the contents of the pseudo output image memory 27.

As is clear from the above description, according to the present invention, in the PLC program development stage, when the operation simulation of the sequence program including the operation of the machine to be controlled is performed, the desktop simulation or the simulation switch is connected. , A static operation simulation with the PLC incorporated in a machine and wired can be executed by a single PLC. Therefore, it is possible to improve the efficiency of debugging the sequence program and prevent damage accidents and the like when the machine is operated by an incorrect sequence program.

Further, the physical size of the PLC is the input / output terminal block, the input / output interface, and the corresponding DC.
It is almost determined by the power source, and the proportion occupied by the control part centering on the CPU and memory is extremely small. Therefore, even if the memory is expanded to increase the storage area for the sequence program and the pseudo input / output image data, the PLC for simulation is practically the same as the conventional PLC.
Can act on your behalf.

[Brief description of the drawings]

FIG. 1 is a configuration block diagram of a programmable controller (PLC) applied to first and second embodiments of the present invention.

FIG. 2 is a block diagram for explaining the operation and operation of the first embodiment.

FIG. 3 is a relay ladder diagram which is an example of the contents of first and second sequence programs shown in FIG.

FIG. 4 is a flowchart showing the role of a parameter memory according to the second embodiment.

FIG. 5 is a configuration diagram illustrating a connection relationship of each PLC when a sequence program is simulated by a conventional PLC.

FIG. 6 is a relay ladder diagram showing an example of contents of first and second sequence programs in FIG.

[Explanation of symbols]

15 programmable controller, 16 microprocessor, 19 multiple input switches, 20 input image memory, 21 output image memory, 22 program memory, 25 multiple output loads, 26 pseudo input image memory, 27 pseudo output image memory, 28 composite input image Memory (for storing synthetic ON / OFF signal), 31 Parameter memory, 32 First sequence program, 33 Second sequence program, 4
1 Step of omitting the logical combination processing, 47 Step of giving priority to the pseudo output image memory.

Claims (7)

[Claims] 1. A program memory storing a first sequence program to be an operation verification target and a second sequence program simulating the operation of a device to be controlled by the first sequence program, and to these sequence programs. A control processing unit that performs sequence control processing based on the above, a processing result memory that stores the processing result of the first sequence program, and a pseudo output memory that stores the processing result of the second sequence program that captures the processing result. The programmable controller, wherein the control processing unit captures the content of the pseudo output memory as a control input into the first sequence program, performs program processing, and verifies operation. 2. A program memory storing a first sequence program to be an operation verification target and a second sequence program simulating the operation of a device to be controlled by the first sequence program, and to these sequence programs. A control processing unit that performs sequence control processing based on the above, a processing result memory that stores the processing result of the first sequence program, and a pseudo output memory that stores the processing result of the second sequence program that captures the processing result. And a logic coupling means for logically coupling the processing result stored in the pseudo output memory and the input signal fetched into the first sequence program, wherein the control processing section uses the logical synthesis result as a control input. Import into the first sequence program, process the program, and Programmable controller and performing the verification. 3. The programmable controller according to claim 2, wherein the logic combination means logically ORs the processing result stored in the pseudo output memory and the input signal fetched into the first sequence program. 4. A content equivalent to a processing result memory,
The pseudo input memory in which the stored contents are written under a different name from the processing result memory, and the contents of the pseudo input memory are fetched into the second sequence program. Programmable controller. 5. The programmable controller according to claim 1, further comprising a program selection unit that selects execution / non-execution of the second sequence program. 6. A control signal to be incorporated into the first sequence program, which is a composite signal obtained by a logical sum of an input signal and the content of the pseudo output memory which is the processing result of the second sequence program, or the content of the pseudo output memory. Is provided with a parameter memory in which information on whether to select is set corresponding to the number of the input signal, and the control processing unit reads the setting information of the parameter memory every time the input signal is fetched, and inputs the control input to the first sequence program. The programmable controller according to claim 2, wherein the programmable controller is selected. 7. A program control means for omitting logical connection when the second sequence program is not executed and for handling a large number of input signals as control inputs to the first sequence program. 5. The programmable controller according to item 5.