JPS63239506A - Measuring control system - Google Patents

Abstract

PURPOSE:To attain the remodeling of a program with an on-line without executing the erroneous action of a system by changing an access area while a controller performs the control program execution and executing the control program for remodeling with a bumpless. CONSTITUTION:The system is composed of a system memory 12b corresponding to the work area of an area for a system in a controller 1, a sharing memory 13 (A, B) and two port memories and assigned to the same address space on a memory map in a maintenance device 3. When an application program stored into a memory 13B is executed by a CPU 11, a remodeling program A can be stored into a memory 13A in the on-line condition. The loaded program A is activated by a switching circuit 38 or a change-over switch 16, the activation is loaded to a system program by an interruption signal and the execution is switched to the program A. Thus, the remodeling program A is loaded and execution can be shifted during the on-line of the controller 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a measurement control system, and particularly to a device for modifying a controller program online.

[Conventional technology]

In the conventional measurement control system,
As described in No. 9041, a controller including a CPU that controls processes within a plant, performs self-diagnosis within its own controller, and transmits the diagnosis results electronically, and a CPU that captures and collects this self-diagnosis data. Data collection devices including were linked online.

In addition, the controller and the data collection device have memories for various fields, and the ROM of the controller stores a process control program and a self-diagnosis program, and the RA
An operation is performed on the data in M.

The data collection device receives self-diagnosis data from the controller, stores it in the RAM, and displays it on the display unit. The program that performs this data collection and display is R
Stored in OM.

Therefore, the CPU of the data collection device cannot access the memory of the controller, and only collects self-diagnosis data sent from the CPU of the controller.

Further, the controller CP[+ executes two tasks in a time-sharing manner: process control, which is its original purpose, and self-diagnosis and data transmission.

[Problem that the invention seeks to solve]

The above-mentioned conventional technology does not take into consideration the program modification of the controller while it is under online control, and the memory is accessed from another CPU and the program in the specified area is executed independently of the controller's original task of process control calculation. Each time a program is modified for execution, it is necessary to travel to the plant site with, for example, a floppy disk containing the program, resulting in a huge waste of time and money.

In particular, if the program was simply sent by mail, the program creator could not check whether the plant would be controlled normally, so modifications were not successful, and the program had to be made on-site.゛An object of the present invention is to provide a measurement control system in which a controller program can be remotely modified online.

[Means for solving problems]

In order to achieve the above object, the present invention provides a controller including a CPU that collects data from a plant and controls the plant based on the data, and a maintenance device including a CPU that maintains the controller while communicating with a remote maintenance device. In a measurement control system consisting of a controller, 2
A work memory that can be accessed in common from two CPUs, a program storage memory that can be accessed in common from two CPUs, and a program storage memory that is maintained online while the program in the program storage memory is being executed. A maintenance device comprising means for storing other programs sent from the device and means for switching execution of the stored programs.

The present invention proposes a measurement control system that includes means for sending the other program to the controller according to instructions from a remote maintenance device or the controller itself, and means for instructing program switching.

The program storage memory can also be configured with at least two memories that are completely separated in terms of hardware.

Further, the maintenance device may include means for comparing the calculation results of the currently running program and the calculation results of the new program.

That is, in the present invention, the memory in the controller is a two-board memory, and the CPU in the controller and the CPU in the maintenance device are connected to each other.
The area allocated to the shared part on the memory map can be accessed from both U and U, and dedicated areas for each of the two programs are provided, and one of these two programs can be specified to control the CPU. This allows execution to be switched.

[Effect]

The controller loads program B for modification into dedicated shared memory B while executing program A stored in shared memory A, which is a two-port memory. Execution is transferred to program B according to the program switching command taken into the CPU of the controller. Dedicated areas are reserved for programs A and B, and the CPU can switch program execution without mechanically switching the memory by simply moving the memory access area and switching program execution by interrupting the switching command. It becomes possible to modify the program online.

〔Example〕

Next, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a system diagram showing the entire system configuration for switching a program online while communicating with a remote maintenance device. In the figure, 1 is a controller;
3 is the maintenance device, 8 is a communication control device, 85 is a communication line, 8a is a communication control device on the side of the remote maintenance device 3a, 4a is a floppy disk drive 22 (FDD), 5a is a display [(CRT), 6a is a is a keyboard, and 7a is a printer. The remote maintenance device 3a can access the memory within the controller 3, as will be described later.

FIG. 2 is a block diagram showing the detailed configuration of the controller 1 and maintenance device 3. As shown in FIG. In the figure, the controller 1 includes a CPU II, system memories 12a and 12b, a shared memory 13, an input circuit 15, a changeover switch 16, an output circuit 17, a display 18, an internal bus 20, and a maintenance bus 21. and a maintenance device interface 19.

A system program for managing the controller 1 is stored in the system memory 12a.

This can be accessed from the internal bus 20, but not from the maintenance bus 21.

The system memory 12b is a 2-port memory.

Accessed from both the internal bus 20 and the maintenance bus 21,
This is for work that stores input data, output data, etc.

The shared memory 13 is connected to the internal bus 20 as a 2-port memory.
and the maintenance bus 21, and stores an application program for controlling the system. Memory capacity is secured to accommodate at least two application programs.

The CPU 1 selects and executes one of the programs stored in the shared memory 13 under the control of the system program stored in the system memory 12a.

The input circuit 15 takes in a signal from the changeover switch 16 or a changeover circuit 38 (described later), interrupts the CPU 11, and instructs which of the programs to execute. The output circuit 17 detects which one is selected and is in the execution state by the above-mentioned interrupt, and displays it on the display 18.

The maintenance interface 19 is a buffer for connecting the maintenance bus 21 in the controller 1 and the maintenance device internal bus 37 in the maintenance device 3.

Next, the maintenance device 3 includes the CPU 31, the memory 32, and the F
It consists of a DD 33, a CRT interface 34, a keyboard interface 35, a printer interface 36, a maintenance device internal bus 37, a switching circuit 38, and a communication control device interface 39.

The CPU 31 uses the program in the memory 32 to execute the program in the memory 32 . Programs and data are accessed between each interface and the controller and communication control device.

Here, the operation of the embodiment shown in FIG. 2 will be explained with reference to FIGS. 2 and 4. FIG. 4 is a diagram showing a memory map within the maintenance device 3 and the controller 1.

The system area of the maintenance device 3 and the system area of the controller 1 are each independently secured and cannot be accessed from each other.

The system area in the maintenance device 3 stores programs to be executed by the CPU 31, but also includes a work area.

The system memory area in controller 1 contains the CPU
The system program that manages II is stored,
There is also a work area.

Also, on the memory map in the controller, CPUll
- There are shared memory areas A and B that store application programs A and B to be executed.

A system memory 12b corresponding to the work area of the system area in the controller 1 and a shared memory 13 (A
, B) are composed of two-port memories and are allocated to the same address space on the maintenance equipment internal memory map.

When loading program A into the shared memory 13 in the controller 1, set the floppy disk containing program A in the FDD 4 connected to the maintenance bag [3] and start it from the keyboard 6. Using the keyboard 6, input the loading area of the set program A on the memory map in the controller 1 as A.

The CPU 31 of the maintenance device 3 converts the program stored in the set floppy disk into an absolute address in the memory area specified by the keyboard 6, and then sends the program via the maintenance device internal bus 37, the maintenance device interface 19, and the maintenance bus 21. - Load it into A of the shared memory 13.

At this time, if the CPU II is running the application program stored in B of the shared memory 13,
You can perform the above loading while remaining online.

The same holds true when loading program B onto the shared memory 13.

Based on the memory set area designation of the keyboard 6, the set program is loaded on top of the address conversion.
The set program is shared memory A.

There is no need to be aware of the absolute address of B.

To start the program A loaded into A of the common memory 13 of the controller 1, the program is switched to A by a signal from the switching circuit 38. If there is an operator near the controller 1, the changeover switch 16 can also be used.

As shown in FIG. 5, this interrupt signal activates the system program stored in the system memory, and execution is switched to program A assigned to A in the shared memory 13. This switching is not a mechanical memory switching, but from the CPU's perspective, the access area is simply moved, so that continuity of processing is maintained.

The method of loading the modification program into a designated memory area and starting it while the controller 1 is online is summarized as shown in FIG. 6.

In addition, when loading the modification program A into the shared memory 13 A in the controller 1, the system memory 12
Work data in b and 35.

Program B stored in B of the shared memory 13 and being executed
The execution results can be monitored through the CRT 5 or printer 7 connected to the maintenance device 3 or remote maintenance device 3a.

Next, when modifying the program of the controller 1 online, a method of starting the modification program after comparing and confirming the execution calculation results of the program currently being executed and the modification program will be explained.

Input the process status signal to controller 1, and
The operation will be explained by taking as an example a case where closed loop control is executed in which a process control signal is output after calculation.

As shown in FIG. 7, input data of process status signals and output data of calculation results are stored on the system memory 12b as a work area in the controller 1.

This system memory 12b is allocated as a shared memory area within the controller 1 and the maintenance device 13,
It is accessed by both CPU 1 and CPU 31.

For example, assume that program A stored in A of the shared memory 13 is currently being executed, and modified program B is stored in B of the shared memory 13.

The maintenance device 3 causes the program B stored in the shared memory area to perform calculations based on the input data on the shared memory area. This calculation result is stored in a shared system area and compared with the output data on the shared memory area in which the calculation result of the program A currently being executed is stored.

As a result, if the execution result of the modified program B is determined to be normal, the program can be switched by the switching circuit 38 or the changeover switch 16.

Each output data of the program A and the modification program B and the comparison result of the output data are output to the CRT 5 and printer 7 connected to the maintenance device 3 or the remote maintenance device 3a.

The modification program can be loaded into the shared memory 13 from either the maintenance device 3 or the remote maintenance bag GL3a, and is carried out using the FDD 4 or 4a and the keyboard 6 or 6a.

Figure 3 shows that the shared memory is divided into two parts, 13 and 14.
This is an example of parallel installation. Even when a program in either memory is being executed, the other memory is completely empty, so there is an advantage that a modified program can be loaded without worrying about remaining memory capacity or switching time.

〔Effect of the invention〕

According to the present invention, the following effects can be obtained.

(1) The controller is executing a control program.

By simply changing the access area, without relying on mechanical methods,
Execution can be switched to the control program for modification without bumping, and the program can be modified online without causing system malfunction, increasing operating efficiency.

(2) When modifying a program in an online state, you can compare the calculation results of the currently running program with the calculation results of the modification program and determine whether there is any problem with running the modification program. The reliability of the program becomes higher.

(3) By remote control via a communication line, programs can be modified online, and modifications can be made quickly, greatly reducing the time and cost of one worker's business trips.

[Brief explanation of drawings]

Figure 1 is a system diagram showing the overall configuration of an embodiment of the measurement control system according to the present invention, Figure 2 is a block diagram showing the detailed configuration of the controller and maintenance device of the embodiment in Figure 1, and Figure 3 is the same. A block diagram showing a configuration in which two shared memories are arranged in parallel, FIG. 4 is a diagram showing a memory map in the controller and maintenance equipment, FIG. 5 is a diagram explaining switching of program execution, and FIG. 6 is an online program according to the present invention. FIG. 7, which is a diagram showing the modification method, is a diagram showing a memory map for comparing the calculation results of the old and new programs. DESCRIPTION OF SYMBOLS 1... Controller, 3... Maintenance device, 4... Floppy disk drive device (FDD), 5... Display device (CRT) 6... Keyboard, 7... Printer, 8
...Communication control device, 11...CPU, 12...System memory, 13°14...Shared memory, 15...
- Input circuit, 16... Selector switch, 17... Output circuit, 18... Display %19... Maintenance device interface, 20... Internal bus. 21...Maintenance bus, 31...CPU, 32...Memory. 33...FDD interface, 34...CRT
Interface, 35... Keyboard interface, 36... Printer interface, 37...
- Internal bus, 38... switching circuit, 39... communication control device interface, 85... communication line.

Claims (1)

[Claims] 1. A controller including a CPU that collects data from a plant and controls the plant based on the data;
A measurement control system comprising: a maintenance device including a CPU that maintains the controller while communicating with a remote maintenance device; a program storage memory accessible to the program storage memory; and means for storing another program sent from the maintenance device side in the program storage memory while the program in the program storage memory is being executed in an online state;
means for switching execution of the stored program; means for the maintenance device to send the other program to the controller according to instructions from the remote maintenance device or itself; and means for instructing switching of the program; A measurement control system characterized by comprising: 2. The measurement control system according to claim 1, wherein the program storage memory comprises at least two memories. 3. The measurement control system according to claim 1 or 2, wherein the maintenance device includes means for comparing the calculation results of the currently running program with the calculation results of the new program. .