JPH03182904A - Plant controller - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a plant control device applied to control of, for example, steel and general industrial plants.

[Conventional technology]

Figure 2 shows, for example, the Mitsubishi plant controller MELPLA.
It is a block diagram showing the conventional plant control device shown in the C550 instruction manual, and it is roughly divided into CPU frames (1
) and an I/O frame (2).

The CPU frame (1) is a CPU card (3) serving as a central control unit that executes and processes plant control programs.
), a memory card that stores the plant control program (
4) , PP I/F card (5), option card (6) which is various I/O cards such as a counter card installed when expanding the system and a DI card with interrupt.
, a path buffer card (8) connected to a local bus (7).

The I/O frame (2) also includes a remote I/O main station (9), a counter card (11) connected to a pulse generator (/O), and a DI card with interrupt (12) connected to a limit switch, etc. , various 1/D cards (13
), the above-mentioned cards, and a ■/O buffer card (14) connected to the above-mentioned local bus (7).

The PP I/F card (5) of the CPU frame (1) has a programming panel "hereinafter referred to as PP (15)J, abbreviated as MTPR, is connected to this PP (15), and a tape reader (16)J, hereinafter abbreviated as MTPR, is connected to this PP (15).

The CPU frame (1) has a common bus (
17) connected to the bus buffer card (18), multipath controller (19), memory card (20) to be installed when expanding, CPU card (21), PPI
Multi-CPU frame (2) with /F card (22)
3) has been added.

The I/O frame (2) also includes a remote I/O local station (24) connected to the remote I/O main station (9), and various I/O cards (25).
A remote I/O local frame (26) is added.

Next, the operation will be explained. A control program created for each plant is developed on a computer (not shown) and stored on a cassette tape. Then, when this cassette tape is set in the MTPR (16), the control program read from this cassette tape is transferred to the memory card (4) via the PP (15) and the PP I/F card (5).
and executed by the CPU card (3).

When this CPU card (3) is executed, the I/O frame (
2) The plant is controlled by accessing a group of human output cards such as a counter card (11), a DI card with interrupt (12), and various I/O cards (13) installed in the plant.

Further, as the scale of the plant increases, an option card (6) can be added to the CPU unit (1). This option card (6) includes, for example, a high-speed communication bus, and can link each CPU to form a network.

On the other hand, the control program is re-verified using the actual plant, but contrary to the above, the modified control program is sent via the PP I/F card (5) and PP (14).
The data can be stored on the cassette tape set in the MTPR (16) again.

[Problem to be solved by the invention]

Conventional plant control equipment is configured as described above, so when expanding the system, the interface functions generated by adding option cards must be added to the control program, which requires a large amount of addition. Become. As a result, the original control cycle could no longer be maintained or the system would become overloaded, necessitating the addition of an optional control CPU.

In addition, when retesting control programs on-site, a dedicated PP must be used and general-purpose terminal equipment cannot be used, making it impossible to use commercially available software or highly functional commercially available products. Ta.

Conventional plant control devices usually operate without using an external storage device (such as a hard disk), so a separate option card is required when adding an external storage device. In addition, there were other problems, such as the fact that software could not be easily created (easily created on a disk) in response to requests, and that it could not be easily converted into a ROM when incorporated into a system.

This invention was made with the aim of solving the above-mentioned problems.It is possible to handle system expansion without adding option cards, and it also allows for major changes to the original plant control program. No need to add anything.

In addition, in order to easily enhance the functionality of the programming panel when retesting programs, commercially available high-performance general-purpose equipment can be easily connected.
The purpose of this invention is to reduce the addition of CPU and PP and to obtain a plant extraction device that can perform high-speed processing.

[Means to solve the problem]

The plant control device according to the present invention has a built-in memory and can be connected to a central control device that controls the plant, a communication device, a programming panel device, an external storage device, etc., and is capable of system expansion, function addition, and program development. In addition to maintaining and adjusting programs while the system is running,
The CPU frame is equipped with a high-performance peripheral interface card having functions such as plant monitoring.

[Effect]

The high-performance peripheral interface card according to this invention is
without affecting the solid equipment that controls the plant.
In addition, system expansion, function addition, and program development can be performed without adding option cards or modifying plant control programs, and program maintenance, adjustment, plant monitoring, etc. can be performed while the system is running. is possible.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

As shown in Fig. 2, the plant control device consists of a CPU frame (1) and an I/O frame (2), and Fig. 1 is a block diagram showing the configuration of this CPU frame (1). It is a diagram.

In the figure, a CPU frame (1) includes a central control unit (31) having an internal memory, and a communication device "card (31)".
2) J and connection interface R3232CSGP-I
An external storage device (35) that interfaces with the programming panel device (33) through B or connects through the driver device (34) when developing additional programs.
) and a high-performance peripheral interface card (36) that has an interface function.

The high-performance peripheral interface card (36) includes peripheral terminal interface function means (36a), external storage device interface function means (36b), internal storage device interface function means (36c), numerical calculation function means (36d), communication control Interface function means (
36e), memory (36f), conversation function means (36g) connected to the central control unit (31), communication device (32), driver device (34) and buffer card (37) via an internal bus (38). It has

Next, the operation of the above embodiment will be explained. The plant control program developed on a computer (not shown) for each order is sent to a programming panel device (3
3) and via the peripheral terminal interface function means (36a) to a memory located in the central control unit (31).

This peripheral terminal interface function means (36a) is a versatile connection interface RC2B2C, GP-
You can choose 2B etc. The programming panel device (33) can also be used to talk to the communication device (32) and frame other than the card or CPU frame (1) connected to the internal bus (38), e.g.
O frame (2) card and conversation function means (36g)
You can have a conversation via .

plan!・When executing a control program, numerical calculation processing is performed by the central control unit (31) or programming panel device (
By executing the numerical calculation function means (36d) other than 33), the execution load of the control program can be reduced.

In addition, in order to avoid placing a load on the central control unit (31) due to the addition of high-speed communication equipment due to system expansion, etc.
There is a communication control interface function means (36e),
No conversation between the central controller (31) and the communication device (32) is required, and the intelligent peripheral interface card (36) can compile and pass the data to the central controller (31).

On the other hand, in order to facilitate the development of software that corresponds to the functions required for each order, a general-purpose external storage device (35) can be connected, and conversations can be performed using the external storage device interface function means (36b). This allows functions to be added on the high-performance peripheral interface card (36) without affecting the control program.

In addition, in the plant, operation using an external storage device (35) is not allowed due to reliability and high-speed operation, but the memory (36f) in the same format as the external storage device (35) is installed on a high-performance peripheral interface card (36). Internal storage interface function means (36, c
) to access the memory (36f), the same functionality as with the external storage device (35) can be changed. In the above embodiment, a programming panel device was explained as a peripheral terminal, but it may also be a device connected using a general-purpose communication procedure such as a connection interface RC232C or GP-IB, and corresponding software can be developed on a high-performance peripheral interface card. can be incorporated. At this time, if connection of an external storage device is permitted due to high speed, etc., it is also possible to connect it.

〔Effect of the invention〕

As described above, according to the present invention, the CPU frame is equipped with a high-performance peripheral interface card equipped with various functional means. This makes it easy to modify and change programs without having to modify them, and it also facilitates program development.Furthermore, program maintenance, adjustment, plant monitoring, etc. can be performed while the system is running. .

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a CPU frame which is a main part of a plant control device according to an embodiment of the present invention, and FIG. 2 is a block diagram of a conventional plant control device. In the figure, (1) is the CPU frame, (2) is the I/O
(31) is a central control unit, (32) is a communication device, (33) is a programming panel device, (35) is an external storage device, and (36) is a high-performance peripheral interface port. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] In a plant control device that has a CPU frame and an I/O frame connected to a local bus, it is possible to connect the central control device that has built-in memory and controls the plant with peripheral devices such as communication devices, programming panel devices, and external storage devices. and a peripheral interface card having functions such as system expansion, function addition, and program development, as well as program maintenance, adjustment, and plant monitoring during system operation, is provided in the CPU frame. Device.