JPH06131016A - Communication system - Google Patents

Abstract

PURPOSE:To improve the work efficiency by allowing the system to have a resuming function by which a continuous execution at the time of generation of an instantaneous stop can be executed smoothly, so that data at the time of generation of the instantaneous stop can be retained. CONSTITUTION:The system is constituted so that a PC 4 and an ICU 11 take a handshake in a software, and can execute simultaneously a continuous execution by adding an execution step stack area storage part 20 and a continuous execution switch 19 to the PC 4, and adding a device memory copy part 17 for copying a device memory part 6 of an execution step stack area storage part 18 to the ICU 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication system capable of continuously executing processing without the user being aware of it even when an instantaneous blackout exceeding an allowable instantaneous blackout time occurs.

[0002]

2. Description of the Related Art FIG. 12 is a block diagram showing a system configuration of a conventional programmable controller (hereinafter referred to as PC) and an intelligent communication unit (hereinafter referred to as ICU).
Is a power supply unit for supplying power to each of the PC and ICU, 2 is a power supply unit for supplying power provided in the power supply unit 1, and 3 is a voltage drop by inputting a voltage level from the power supply unit 2. It is a voltage drop detection circuit for detecting whether or not.

Further, 4 is a PC main body, 5 is a CPU section for executing operations of a sequence program in the PC 4, 6
Is a device memory unit for storing the operation result of the PC 4, 7 is a sequence program memory unit for storing the sequence program of the PC 4, 8 is an ICUI / F unit for executing the interface with the ICU, and 9 is output from the voltage drop detection circuit 3. An interrupt signal 10 is a data bus for exchanging data between the PC 4 and the ICU.

Reference numeral 11 is an ICU main body, and 12 is an ICU1.
CPU unit that executes operations of the user program 1
3 is a user program memory unit for storing the user program of ICU 11, 14 is a data memory unit for storing the operation result of the ICU 11 user program, and 15 is a PC 4
A PCI I / F unit for executing an interface with the external device, and an external device I / F unit for executing an interface with the external device.

FIG. 13 is a flow chart showing the execution operation of the user program of the ICU 11, and FIG.
FIG. 15 is a flowchart showing the operation of the C4 when an interrupt signal is generated, and FIG. 15 is a flowchart showing the operation of the ICU 11 when an interrupt signal is generated.

Next, the operation will be described. In FIG. 12, the function of the ICU 11 plays an auxiliary role of the PC 4, and the load distribution in the sequence program operation processing of the PC 4 and a large amount of data processing for processing distribution and the operation result of the sequence program are transmitted to an external device. ICU processes such as output via the I / F unit 16
It is executed by 11 user programs. ICU11
Executes the operation of the user program stored in the user program memory unit 13, and temporarily stores the result in the data memory unit 14 as needed.

In order for the ICU 11 to access the sequence program memory unit 7 and the device memory unit 6 of the PC 4, an instruction is output to the CPU unit 5 of the PC 4 via the PCI I / F unit 15 and the ICUI / F unit 8. , CP of PC4
The U unit 5 analyzes the instruction and executes the reading and writing process of the device memory unit 6. CPU section 5 of PC4
Outputs the processing result to the ICU 11 via the ICU I / F unit 8 and the PCI / F unit 15.

Next, the operation of the ICU 11 executing the user program will be described with reference to FIG. ICU
As a method for the CPU unit 12 of 11 to execute the user program stored in the user program memory unit 13, an interpreter method is used. First, one instruction in the user program is loaded from the user program memory unit 13 (S1300). The CPU 12 executes the analysis of the loaded instruction (S1301), and executes the processing according to the instruction.
This is executed for C4 or an external device (S1302).
Here, the processing according to the command includes a write command to the device memory unit 6 of the PC 4, a read command to the device memory unit 6 of the PC 4, and an access command to the external device via the external device interface unit 16. After the processing of one instruction is completed, it is judged from the user program memory unit 13 whether or not the user program is ended (S1303). If it is judged that the user program is not ended, the next instruction is loaded and the above-mentioned series of steps is performed. The process is repeated, but conversely, when it is determined that the process is terminated, the program execution is terminated.

Next, the operation when an instantaneous blackout occurs will be described. First, in FIG. 12, when a voltage drop occurs, the voltage drop detection circuit 3 detects the voltage drop, and the PC 4
And the interrupt signal 9 is output to the ICU 11, respectively.
In FIG. 14, the PC 4 interrupts the execution of the sequence program by the interrupt signal 9 (S1400), and the PC 4 monitors the state of the interrupt signal 9 in the instantaneous blackout process during the voltage drop interrupt to determine whether or not the voltage drop has disappeared. If it is determined that the voltage drop has disappeared (S1401), execution of the interrupted sequence program is restarted (S1402). On the contrary, if it is determined that there is a voltage drop, the determination in step S1401 is repeated until it is determined that the voltage drop has disappeared.

In FIG. 15, the ICU 11, like the PC 4, suspends the execution of the user program by the interrupt signal 9 (S1500) and monitors the state of the interrupt signal 9,
It is determined whether the voltage drop has disappeared (S1501),
When it is determined that the voltage drop has disappeared, the interrupted execution of the user program is restarted (S1502). On the contrary, if it is determined that there is a voltage drop, the determination in step S1501 is repeated until it is determined that the voltage drop has disappeared.

Next, when the permissible instantaneous blackout time of the system is exceeded, the voltage drop detection circuit 3 causes the CPU section 5 of the PC 4 and the ICU 1 to operate.
The CPU unit 12 of No. 1 is reset by hardware. P
As processing after the reset release of the CPU unit 5 in C4, initial setting of hardware and 0 clearing of the device memory unit 6 are executed at the time of initial processing, but regarding the device memory unit 6, the contents of the device memory unit 6 are set by user setting. It is possible to select whether to hold or clear to 0, and the device memory unit 6 can hold data when an instantaneous blackout exceeding the allowable instantaneous blackout time occurs. However, for the sequence program, PC4
After completing the initial processing, the sequence program of the sequence program memory unit 7 is sequentially processed from step 0.

Next, as the processing after the reset release of the CPU section 12 of the ICU 11 when the allowable instantaneous blackout time of the system is exceeded, no particular attention is paid to the operation after the occurrence of the instantaneous blackout, and the hardware operation is performed during the initial processing. After initial setting and clearing the data memory unit 14 to 0, the program in the user program memory unit 13 is sequentially processed from step 0.

In addition, as reference technical documents related to the present invention, "Maintenance method of remote terminal" disclosed in Japanese Patent Laid-Open No. 3-203437, and Japanese Patent Laid-Open No. 58-108845.
There is a "communication control system" disclosed in the publication.

[0014]

As described above, in the conventional case, when the permissible instantaneous blackout time is exceeded after the occurrence of the instantaneous blackout, the CPU section of the PC and ICU is reset by hardware, and after the reset is released. As for the processing of the PC, only the device memory is backed up for the PC, so the contents can be retained, but the entire system including ICU does not retain the device or execution step before the momentary power failure, nor the data memory. Therefore, there is a problem in that the system cannot be continuously executed and the work efficiency is poor.

The present invention has been made to solve the above problems, and when an instantaneous blackout exceeding the allowable instantaneous blackout time occurs, the ICU detects an interrupt signal of a voltage drop when the instantaneous blackout occurs, At that time, the contents of the execution steps, stack area, data memory, etc. of the user program are stored, and a handshake is performed between the PC and ICU to provide a resume function that enables smooth continuous execution when an instantaneous power failure occurs. The purpose is to save data when it occurs and improve work efficiency.

[0016]

A communication system according to the present invention detects a voltage drop in a programmable controller and an intelligent communication unit capable of executing a user program when an instantaneous blackout exceeding an allowable instantaneous blackout time occurs. When it does, it has a resume function that allows continuous execution by storing the contents of the execution steps, stack area, data memory, etc. up to then, as a copy area of the device memory in the programmable controller provided in the intelligent communication unit. Device memory copy means and the programmable controller of the intelligent communication unit, when executing a device write command to the programmable controller The device in the intelligent communication unit, in the device write means for writing the device in the device memory copy means of the intelligent communication unit at the same time as writing the device in the chair memory, and the initial processing for continuously executing when the instantaneous blackout occurs. Initial writing executing means for writing the device contents copied to the memory copying means to the programmable controller, and simultaneous executing means for executing handshake in the initial processing so that the programmable controller and the intelligent communication unit can be continuously executed simultaneously. And is equipped with.

Further, when the instantaneous blackout occurs in the programmable controller and the intelligent communication unit, the simultaneous execution means executes the instantaneous blackout report program executed at the time of initial processing, and then executes the continuous execution step from the programmable controller and the intelligent communication unit. The handshake is executed so that can be continuously executed at the same time.

In addition, when a voltage drop is detected in the programmable controller and the intelligent communication unit capable of executing the user program when an instantaneous blackout exceeding the allowable instantaneous blackout time occurs, the execution steps, stack area, It has a resume function that allows continuous execution by storing the contents of a data memory, etc., and a command storing means for storing the contents of the instruction for the intelligent communication unit to access the programmable controller, and when a momentary power failure occurs. In the initial processing for continuous execution, the initial command executing means for executing the content of the instruction stored in the command storing means to the programmable controller is provided.

[0019]

The PC and ICU according to the present invention are both provided with a resume function, and the PC and ICU are adapted to perform a handshake, thereby facilitating continuous processing of the entire system from the step when an instantaneous blackout occurs. Can be run to.

Further, by providing both the PC and ICU with a resume function so that the PC and ICU can perform a handshake, and by providing an instantaneous power failure report program,
It is possible to smoothly execute the continuous processing of the entire system from the step when the instantaneous blackout occurs, and to store the number of instantaneous blackout occurrences and the like.

Further, both the PC and the ICU are provided with the resume function so that the PC and the ICU can perform the handshake, and further the ICU stores the contents of the instruction to access the PC. It is possible to smoothly execute the continuous processing of the entire system from the step when the instantaneous blackout occurs, and it is possible to guarantee the data when the instantaneous blackout occurs.

[0022]

【Example】

[Embodiment 1] An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a PC and an ICU equipped with a resume function.
It is a block diagram showing a system configuration of, in the figure,
Reference numeral 17 is a device memory copy unit that copies the contents of the device memory unit 6 of the PC 4, and 18 is I when an instantaneous power failure occurs.
Execution step of CU11, execution step for storing stack area Stack area storage unit, 19 is a continuous execution for setting whether to continuously execute the sequence program of PC4 and the user program of ICU11 after the occurrence of the instantaneous interruption or from 0 step A switch 20 is an execution step stack area storage unit that stores the execution steps and stack area of the PC 4 when an instantaneous blackout occurs.

The ICU 11 is writable only in a predetermined range of the device memory unit 6 of the PC 4, and I
The device memory copy unit 17 of the CU 11 is a copy of the device memory in this range. Also, PC4
Can only read and cannot write in this range.

FIG. 2 is a flow chart showing the execution operation of the user program of the ICU 11, FIG. 3 is a flow chart showing the interrupt processing operation of the PC 4 when an instantaneous blackout occurs, and FIG. 4 is an ICU 11 when the instantaneous blackout occurs. 5 is a schematic flowchart of the initial processing of the PC 4, and FIG. 6 is a flowchart showing the initial processing operation of the ICU 11.

Next, only the part of the operation different from the conventional example will be described. In FIG. 2, the CPU unit 1 of the ICU 11
As a method of executing the user program stored in the user program memory unit 2, the process from step S200 to step S201 is the same as the conventional process. IC
In U11, by providing the device memory copy unit 17 that is a copy of the device memory unit 6 of the PC 4,
Next, the instruction analyzed in step S201 is PC4.
Is determined to be a write command to the device memory unit 6 (S202), and if it is determined not to be a write command to the device memory unit 6 of the PC 4, the process according to the same command as in the related art is executed (S206). ), If it is determined that it is a write command to the device memory unit 6 of the PC 4,
A write command is executed to the device memory copy unit 17 of the ICU 11 (S203), and the ICU of the PC 4 and ICU 11 is executed.
A write command to the device memory unit 6 of the PC 4 is executed via the I / F unit 8 and the PCI I / F unit 15 (S20
4) Then, it is determined whether or not the user program, which is the same process as the conventional process, is completed (S205). Further, the processing in accordance with the command of step S206 includes a write command to the device memory unit 6 of the PC 4, a read command to the device memory unit 6 of the PC 4, and the external device I / F unit 1.
There is a command to access an external device via the command line 6.

Next, the operation when an instantaneous blackout occurs will be described. In FIG. 1, when an instantaneous blackout occurs, the voltage drop detection circuit 3 detects the voltage drop, and the PC 4 and ICU
An interrupt signal 9 is generated for 11 In response to the interrupt signal 9, the PC 4 executes the interrupt process as shown in FIG. 3 to copy the execution step and the stack of the sequence program currently being executed to the execution step stack area storage unit 20 of the PC 4 (S300), and then the step From S301 to S303, the same processing as the flowchart of FIG. 14 shown in the conventional example is executed.

When the interrupt signal 9 is generated, the ICU 11 copies the execution step and stack of the user program currently being executed to the execution step stack area storage unit 18 of the ICU 11 by the interrupt processing as shown in FIG. (S400), and then step S40
From 1 to step S403, the same processing as the flowchart of FIG. 15 shown in the conventional example is executed.

Next, when the permissible instantaneous power failure time of the system of PC4 and ICU11 is exceeded, the internal CPU unit 5 of the PC4 is reset in terms of hardware, and the processing operation after reset release is as shown in the flowchart of FIG. As described above, at the beginning of the initial processing, the sequence program of the PC 4 and the I
The state of the continuous execution switch 19 of the PC 4 that determines whether to continuously execute the user program of the CU 11 from the step when the instantaneous blackout occurs or to start from the 0 step, and that the device memory unit 6 of the PC 4 is writable
1 is notified (S500).

Next, it is judged from the state of the continuous execution switch 19 of the PC 4 whether or not the sequence program is continuously executed from the step when the instantaneous blackout occurs (S501), and the sequence program is continuously executed from the step when the instantaneous blackout occurs. If it is determined that the execution step and the stack in the execution step stack area storage unit 20 of the PC 4 at the time of the instantaneous power failure occur, the program pointer or the stack pointer (not shown) for the sequence program in the sequence program memory unit 7 of the PC 4 (S502), P
Since C4 and ICU11 take a handshake for continuous execution simultaneously, ICU11 is notified of the end of the initial processing of PC4 (S503).

Further, the PC 4 judges whether or not the initial processing of the ICU 11 is completed (S504), and the ICU
If it is judged that the initial process of 11 is not completed,
If it is determined that the initial processing of the ICU 11 is completed by repeating the determination in step S504 until the initial processing is completed, the sequence pointer at the time of the instantaneous power failure is used from the time of the instantaneous power failure using the program pointer or the stack pointer of the sequence program. To continue the execution of (S505), I
It can be continuously executed simultaneously with CU11.

When it is determined in step S501 that the sequence program is to be executed from step 0, the device memory unit 6 is cleared to 0,
Set the program pointer and stack pointer for the sequence program to 0 step (S506)
The process similar to the process for continuously executing from the step when the instantaneous blackout occurs is performed from the process of step S503 to notify the ICU 11 of the end of the initial process of No. 4 and the execution is started from step 0 of the sequence program (S50
5), can be executed simultaneously with ICU11.

Next, when the permissible instantaneous power failure time of the system of PC4 and ICU11 is exceeded, the CPU unit 12 of the ICU11 is reset by hardware, and the processing after the reset is released is the start of the initial processing as shown in FIG. It is determined whether or not writing to the device memory unit 6 of the PC 4 is possible depending on whether or not the process of step S500 shown in FIG. 5 is completed, and if writing is not possible, it is determined until it is possible. Is repeated (S600). If writing is possible, the PC determines whether to continue execution of the user program from the step when the instantaneous blackout occurs or from step 0.
Judgment is made from the state of the continuation execution switch 19 of No. 4 (S60
1).

Therefore, when it is determined that the user program is to be continuously executed from the step when the instantaneous blackout occurs,
The contents of the device memory copy unit 17 are changed to PC4, ICU1.
P using the ICU I / F unit 8 and PCI / F unit 15
Write to the device memory unit 6 of C4 (S602), I
The data memory unit 14 of the CU 11 is held without being cleared to 0, and the execution step and stack of the execution step stack area storage unit 18 of the ICU 11 when the instantaneous power failure occurs are stored in the ICU.
11 is copied to the program pointer or stack pointer (not shown) for the user program in the user program memory unit 13 (S603), and the PC 4 and the ICU 11
Takes a handshake to continuously execute at the same time, so the PC 4 is notified of the end of the initial processing (S60
4).

Further, the ICU 11 judges whether the initial processing of the PC 4 is completed (S605), and the PC 4
If it is determined that the initial processing in step S605 has not been completed, the determination in step S605 is repeated until the initial processing is completed. When it is determined that the initial processing of the PC 4 has ended, the program pointer and the stack pointer of the user program at the time of the momentary power failure are used to start the continuous execution from the time of the momentary power failure (S606) and continue at the same time as the PC4. Can be executed.

When it is determined that the user program is to be executed from step 0, the data memory unit 14 is cleared to 0 and the program pointer and stack pointer for the user program are set to step 0 (S).
607), informing the PC 4 of the end of the initial processing of the ICU 11 From the processing of step S604, the same processing as the processing in the case of continuing execution from the step when the instantaneous blackout occurs is executed, and the execution starts from step 0 of the user program ( S606), and can be executed simultaneously with PC4.

[Second Embodiment] In addition, the PC 4 of the first embodiment described above
And when an instantaneous power failure occurs in ICU11, ICU11
The same is true when the PC2 is provided with an instantaneous power failure report program that is executed at the time of initial processing. Hereinafter, the second aspect of the present invention
The embodiment will be described with reference to FIGS. 7 to 10, and the description of the same parts as those in the first embodiment will be omitted.

The system configuration of the ICU 11 is the same as that of FIG. 1 shown in the first embodiment. However, the sequence program memory unit 7 of the PC 4 stores the conventional sequence program and the instantaneous power failure report program of the PC 4, and the user program memory unit 13 of the ICU 11 stores the conventional user program and ICU.
11 instantaneous power failure report programs are stored. The instantaneous blackout report program records the number of times an instantaneous blackout has occurred, and is created by the user.

FIG. 7 is a flow chart showing the initial processing operation of the PC 4, and FIG. 8 is a flow chart showing the schematic operation of the instantaneous blackout report program of the PC 4, and FIG.
6 is a flowchart showing an initial processing operation of ICU 11. Further, FIG. 10 is a flowchart showing a schematic operation of the instantaneous power failure reporting program of the ICU 11.

Next, regarding the operation, only the part different from the first embodiment will be described. The method by which the CPU unit 12 of the ICU 11 executes the user program stored in the user program memory unit 13 is the same as that shown in FIG. 2 in the first embodiment.

Next, the operation when an instantaneous blackout occurs will be described. First, the operation of the PC 4 is the same as that shown in FIG. 3 in the first embodiment. Also, ICU11
Also, when an interrupt occurs, the same processing as that shown in FIG. 4 in the first embodiment is executed.

Next, when the permissible instantaneous blackout time of the system of PC4 and ICU11 is exceeded, the PC4 becomes CP by hardware.
After the U section 5 is reset and the reset is released, as shown in FIG. 7, step S is performed at the beginning of the initial processing.
700 and step S701 are executed, and these processes are the same as those shown in FIG. 5 in the first embodiment. In the case where the sequence program is continuously executed from the step when the instantaneous blackout occurs, the initial process is executed. Sometimes P
The instantaneous blackout report program of C4 is executed (S702), and steps S703 to S706 are executed. These processes are the same as those shown in FIG. 5 in the first embodiment. In addition, step S7 when executing the sequence program from step 0
07 also performs the same processing as that shown in FIG. 5 in the first embodiment.

P in step S702 in FIG.
As the operation of the instantaneous blackout report program of C4, as shown in FIG. 8, it is determined whether or not a user-created instantaneous blackout report sequence program is created (S800), and the instantaneous blackout report sequence program is created. If it is determined that it is not, the process ends without executing any processing. Conversely, if it is determined that the instantaneous power failure report sequence program is created, after the instantaneous power failure report sequence program is executed, It ends (S801). As an example of the instantaneous blackout report program, the number of instantaneous blackouts is integrated, and when it reaches a certain value, the ICU 11 is notified of the abnormality via the ICU interface unit 8 and the PC interface unit 15, and the ICU 11
There is a program (not shown) for outputting an abnormality to the external device via the external device interface unit 16.

Next, when the permissible instantaneous blackout time of the system of the PC 4 and the ICU 11 is exceeded, the CPU unit 12 of the ICU 11 is reset by hardware, and the processing after the reset is released is the initial processing as shown in FIG. First, step S900 and step S901 are executed, and these processes are the same as those shown in FIG. 6 in the first embodiment. In the case where the user program is continuously executed from the step when the instantaneous blackout occurs, I at initial processing
Execute the instantaneous power failure report program of CU11 (S902),
Steps S903 to S907 are executed,
These processes are the same as those shown in FIG. 6 of the first embodiment. Further, step S908 in the case of executing the user program from step 0 also executes the same processing as that shown in FIG. 6 in the first embodiment.

I shown in step S902 in FIG.
As the operation of the instantaneous blackout report program of the CU 11, as shown in FIG. 10, it is determined whether or not a user-created instantaneous blackout report user program is created (S1000), and the instantaneous blackout report user program is created. If it is determined that there is no processing, the process ends without executing any processing, and if it is determined that the user program for instantaneous power failure report has been created,
After executing the user program, the process ends (S100).
1). An external device I / F is an example of the instantaneous power failure report program.
An external device such as a printer via the unit 16 has a program (not shown) for printing the number of instantaneous blackouts on the printer or outputting it on a display.

[Third Embodiment] Further, both the PC 4 and the ICU 11 are provided with a resume function, and the command storage means for storing the contents of the instruction for the ICU 11 to access the PC 4 and the continuous execution when the instantaneous blackout occurs. The same applies to the case where an initial command executing means for executing the stored instruction content to the PC 4 is provided in the initial processing for this purpose. The third embodiment of the present invention will be described below with reference to FIG. 11, and the description of the same parts as those of the first embodiment will be omitted.

FIG. 11 shows a PC 4 having a resume function.
2 is a block diagram showing a system configuration of ICU 11 and FIG.
In the figure, reference numeral 21 denotes a command content storage unit that stores the content of the command if it is a write command to the PC 4 when the user program is executed.

Next, the operation will be described only for the points different from the first embodiment. The method by which the CPU unit 12 of the ICU 11 executes the user program stored in the user program memory unit 13 is the same as that shown in FIG. 2 in the first embodiment. However, in this embodiment, instead of step S203 shown in FIG. 2, the content of the write command is stored in the command content storage unit 21.

Processing when an instantaneous blackout occurs will be described. First, as the processing of the PC 4, the same processing as that shown in FIG. 3 in the first embodiment is executed. ICU11
Performs the same processing as that shown in FIG. 4 in the first embodiment when an interrupt occurs. Next, PC4 and ICU
When the permissible instantaneous blackout time of the system 11 is exceeded, the CPU 4 of the PC 4 is reset by hardware and the processing after the reset is released is the same as that shown in FIG. 5 in the first embodiment.

Next, when the permissible instantaneous blackout time of the system of the PC 4 and the ICU 11 is exceeded, the CPU unit 12 of the ICU 11 is reset by hardware, and the processing after the reset release is shown in FIG. Similar to the above, but since the writable range is determined by the ICU 11, instead of the process of writing the contents of the device memory copy unit 17 in the step S602 to the device memory unit 6 of the PC 4, in this embodiment, , The contents of the command content storage unit 21 are sequentially executed to the PC 4, the contents of the device memory unit 6 of the PC 4 are returned to the contents at the time of the instantaneous blackout, and the continuous execution is possible from the time of the instantaneous blackout, and then Similar to the first embodiment, a handshake is performed with the PC 4 to continue execution.

[0050]

As described above, according to the communication system of the present invention, when an instantaneous blackout exceeding the allowable instantaneous blackout time occurs, the ICU detects the voltage drop interrupt signal at the time of the instantaneous blackout, and at that time, The contents of user program execution steps, stack area, data memory, etc. are stored in and a resume function is provided so that continuous execution can be smoothly performed when an instantaneous blackout occurs by handshaking between the PC and ICU. It is possible to save the data of and improve work efficiency.

[Brief description of drawings]

FIG. 1 is a block diagram showing a system configuration of a PC and an ICU having a resume function according to the present invention.

FIG. 2 is a flowchart showing a schematic operation of executing a user program of the ICU according to the present invention.

FIG. 3 is a flowchart showing an interrupt processing operation of the PC when an instantaneous blackout occurs according to the present invention.

FIG. 4 is a flowchart showing an interrupt processing operation of the ICU when an instantaneous blackout occurs according to the present invention.

FIG. 5 is a flowchart showing an initial processing operation of the PC according to the present invention.

FIG. 6 is a flowchart showing an initial processing operation of the ICU according to the present invention.

FIG. 7 is a flowchart showing an initial processing operation of the PC according to the present invention.

FIG. 8 is a flowchart showing a schematic operation of a PC instantaneous interruption report program according to the present invention.

FIG. 9 is a flowchart showing an initial processing operation of the ICU according to the present invention.

FIG. 10 is a flowchart showing a schematic operation of an ICU instantaneous blackout report program according to the present invention.

FIG. 11 is a PC having a resume function according to the present invention.
FIG. 3 is a block diagram showing a system configuration of the ICU.

FIG. 12 is a block diagram showing a system configuration of a conventional PC and ICU.

FIG. 13 is a flowchart showing a conventional operation of executing a user program of an ICU.

FIG. 14 is a flowchart showing a schematic operation when a conventional PC interrupt signal is generated.

FIG. 15 is a flowchart showing a general operation when a conventional ICU interrupt signal is generated.

[Explanation of symbols]

 1 power supply unit 2 power supply unit 3 voltage drop detection circuit 4 PC 5 CPU unit 6 device memory unit 7 sequence program memory unit 8 ICUI / F unit 9 interrupt signal 10 data bus 11 ICU 12 CPU unit 13 user program memory unit 14 data memory unit 15 PCI / F section 16 External device I / F section 17 Device memory copy section 18 Execution step stack area storage section 19 Continuous execution switch 20 Execution step stack area storage section 21 Command content storage section

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] June 10, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction content]

Next, the operation of the ICU 11 executing the user program will be described with reference to FIG. ICU
As a method for the CPU unit 12 of 11 to execute the user program stored in the user program memory unit 13, an interpreter method is used. First, one instruction in the user program is loaded from the user program memory unit 13 (S1300). The CPU 12 executes the analysis of the loaded instruction (S1301), and executes the processing according to the instruction.
This is executed for C4 or an external device (S1302).
Here, the processing according to the command means a write command to the device memory unit 6 of the PC 4, a read command to the device memory unit 6 of the PC 4, and the external device I / F unit 16
There is an instruction to access an external device via the. After the processing of one instruction is completed, it is determined from the user program memory unit 13 whether the user program is completed (S13).
03) If it is determined that it has not ended, the next instruction is loaded and the above-described series of processing is repeated. On the contrary, if it is determined that it has ended, execution of the program ends.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0014

[Correction method] Change

[Correction content]

[0014]

As described above, in the conventional case, when the permissible instantaneous blackout time is exceeded after the occurrence of the instantaneous blackout, the CPU section of the PC and ICU is reset by hardware, and after the reset is released. As for the processing, only the device memory of the PC is backed up (Fig.
The contents can be retained because it is not shown). However, the entire system including the ICU, etc. cannot be continuously executed in the entire system because the device and execution step before the momentary power failure and the data memory are not retained. There was a problem that work efficiency was poor.

[Procedure 3]

[Document name to be amended] Statement

[Name of item to be corrected] 0024

[Correction method] Change

[Correction content]

FIG. 2 is a flow chart showing the execution operation of the user program of the ICU 11, FIG. 3 is a flow chart showing the interrupt processing operation of the PC 4 when an instantaneous blackout occurs, and FIG. 4 is an ICU 11 when the instantaneous blackout occurs. 5 is a flow chart showing the initial processing operation of the PC 4, and FIG. 6 is a flow chart showing the initial processing operation of the ICU 11.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0028

[Correction method] Change

[Correction content]

Next, when the permissible instantaneous blackout time of the system of PC4 and ICU11 is exceeded, the PC4 becomes C
As the processing operation after the PU unit 5 is reset and the reset is released, as shown in the flowchart in FIG. 5, the sequence program of the PC 4 and the ICU 1 are set at the beginning of the initial processing.
A PC that determines whether to continuously execute the user program of 1 from the step when the instantaneous blackout occurs or from the 0 step
The state of the continuous execution switch 19 of No. 4 and the device memory unit 6 of the PC 4 are written to the ICU 11 (S500).

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0036

[Correction method] Change

[Correction content]

[Second Embodiment] In addition, the PC 4 of the first embodiment described above
And when an instantaneous power failure occurs in ICU11, ICU11
The same is true when the PC 4 is provided with an instantaneous blackout report program to be executed at the time of initial processing. Hereinafter, the second aspect of the present invention
The embodiment will be described with reference to FIGS. 7 to 10, and the description of the same parts as those in the first embodiment will be omitted.

[Procedure correction 6]

[Document name to be amended] Statement

[Name of item to be corrected] 0037

[Correction method] Change

[Correction content]

The system configuration of the ICU 11 is the same as that of FIG. 1 shown in the first embodiment. However, the sequence program memory unit 7 of the PC 4 stores the conventional sequence program and the instantaneous power failure report program of the PC 4, and the user program memory unit 13 of the ICU 11 stores the conventional user program and ICU.
11 instantaneous power failure report programs are stored. In addition, the instantaneous power failure reporting program is one that can be recorded and the number of times the instantaneous power failure has occurred, is made Ri operation by the user.

[Procedure Amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0042

[Correction method] Change

[Correction content]

P in step S702 in FIG.
As the operation of the instantaneous blackout report program of C4, as shown in FIG. 8, it is determined whether or not a user-created instantaneous blackout report sequence program is created (S800), and the instantaneous blackout report sequence program is created. If it is determined that it is not, the process ends without executing any processing. Conversely, if it is determined that the instantaneous power failure report sequence program is created, after the instantaneous power failure report sequence program is executed, It ends (S801). As an example of the instantaneous blackout report program, the number of instantaneous blackouts is integrated, and when it reaches a certain value, it is regarded as an abnormal condition and the ICU I / F unit 8 and the PC I / F unit 1
The ICU 11 notifies the abnormality via 5 and the external device I / F
There is a program (not shown) for outputting an abnormality to the external device via the unit 16.

[Procedure Amendment 8]

[Document name to be amended] Statement

[Name of item to be corrected] Fig. 13

[Correction method] Change

[Correction content]

FIG. 13 is a flowchart showing a general operation of executing a conventional ICU user program.

[Procedure Amendment 9]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 10

[Correction method] Change

[Correction content]

[Figure 10]

Claims (3)

[Claims] 1. A programmable controller and an intelligent communication unit capable of executing a user program, when a voltage drop is detected when an instantaneous blackout occurs that exceeds an allowable instantaneous blackout time, execution steps, a stack area, A device memory copy means is provided as a copy area of the device memory in the programmable controller provided in the intelligent communication unit, which has a resume function capable of continuous execution by storing the contents of the data memory and the like, and the intelligent communication unit. When a device write command to the programmable controller is executed, the device is written in the device memory of the programmable controller and at the same time, the intelligent code is written. In the device writing unit that writes the device to the device memory copying unit of the communication unit, and in the initial processing for continuing execution when an instantaneous power failure occurs, the device contents copied to the device memory copying unit in the intelligent communication unit are written. It is characterized by further comprising an initial writing executing means for writing to the programmable controller, and a simultaneous executing means for executing a handshake so that the programmable controller and the intelligent communication unit can be continuously executed simultaneously in the initial processing. Communication system. 2. The simultaneous execution means, when an instantaneous blackout occurs in the programmable controller and the intelligent communication unit, executes the instantaneous blackout report program executed at the time of initial processing, and then executes the continuous execution step from the programmable controller and the intelligent communication unit. The communication system according to claim 1, wherein the handshake is executed so that the two can continue to execute simultaneously. 3. A programmable controller and an intelligent communication unit capable of executing a user program both detect a voltage drop when an instantaneous blackout occurs that exceeds an allowable instantaneous blackout time, and then execute steps, stack areas, and so on. It has a resume function that allows continuous execution by storing the contents of a data memory, etc., and a command storing means for storing the contents of the instruction for the intelligent communication unit to access the programmable controller, and when a momentary power failure occurs. A communication system comprising: initial command execution means for executing the content of the instruction stored in the command storage means to the programmable controller in the initial processing for continuous execution. Mu.