JPS62100857A - Control system for transmission of information - Google Patents

Abstract

PURPOSE:To prevent the deterioration of the overall processing capacity of a control system for transfer of information despite the increase of the information quantity, by transferring the information only between the controller selected by a route selecting device and a shared memory of each block. CONSTITUTION:The controllers 11 and 12 have control buses 71 and 72 and connected with (n) pieces of shared memories 131-13n divided for each transfer of information via route selecting circuits 141-14n. These circuits 141-14n select the controller 11 or 12 according to the states of selection state display circuits 151-15n and connect the memories 131-13n to the bus 71 or 72. In case a shared memory 13k, for example, is kept under the control of the controller 11 and the information is transferred to the controller 12 from the controller 11, the controller 11 writes the information to be transferred to the memory 13k and then rewrites the state of a selection state display circuit 15k to select the controller 12 to which the data is transferred.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an information transmission control system that exchanges information between control devices via a memory shared by a plurality of control devices.

[Conventional technology]

Conventionally, this type of system has a control section 11. as shown in FIG. Memory section 21. The device 1 includes a transfer control section 31, a control section 12. Memory section 22. Transfer control unit 32
A device 2 consisting of
．． 32 are activated, and the contents of the memory section 21 are transferred via the transfer port 40. However, in this system, when the amount of transfer is large, the control bus 71
．． There is a problem in that the processing capacity of the control units 11 and 12 decreases because the time required to use the controller 72 for transfer increases.

Accordingly, as shown in FIG. A system has been proposed in which control units 11 and 12 communicate with each other via a shared memory 60 that is accessible from both sides.

[Problem that the invention seeks to solve]

However, in the system shown in FIG.
Since the probability of duplicate access requests to 0 increases, the number of retries and wait times for the control units 11 and 12 to access the shared memory 60 increases, making access to the shared memory 60 difficult and reducing the processing capacity of the entire system. A problem arose in that the value decreased. Furthermore, even when a large amount of data is transferred, accessing the shared memory 60 becomes difficult.
A similar problem arises.

An object of the present invention is to provide an information transmission control system that can prevent the processing capacity of the entire system from decreasing even when the amount of information increases.

[Means for solving problems]

The information transmission control system of the present invention is a system in which a plurality of control devices are each connected to a shared memory via a control bus, and information is exchanged between each control device via the shared memory. A route selection circuit that selects a specific control device from the control device group and connects it to the shared memory of each block via a control bus. The feature is that information is exchanged only between the control device selected by the controller and the shared memory of each block.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a configuration diagram showing an embodiment of the present invention, and FIG. 1 shows a configuration in which there are two control devices. In the figure, the control devices 11.12 each have a control bus 71.12.
72, and each control bus 71.72 has n shared memories 131 to 13n divided into information transfer units, each having a route selection circuit 14.72. ~14. connected via. and each route selection circuit 14. ~14. are selection state display circuits 15, -15. is connected.

Each route selection circuit 14□~14a is a control device 11.12
Select one of the control devices from among the shared memories 13,
~13n and the control bus 71 or the control bus 72 are connected. In this selection, which control device is selected is determined by the selection state display circuit 15. ~15. ．． determined by the state of For example, the shared memo IJ13k is the control device 11
When transferring information from the control device 11 to the control device 12, the control device 11 writes the information to be transferred to the shared memory 13□ and then rewrites the state in the selection state display circuit 15. control device 1, which is the data transfer destination.
Make sure to select 2. control device 1] is a shared memory 1
3k and the state of the selection state display circuit 15□ cannot be changed.

On the other hand, the control device 12 controls the selection state display circuit 15. It is possible to detect that information has been transferred from the state of . Thereafter, only the control device 12 can access the shared memory 13, but the control device 12 can access the shared memory 1J13. When the content of is unnecessary, the state of is rewritten in the selection state display circuit 15 so that the shared memo 'J 13k is connected to the control device 11.

At this time, if there is any information that you would like to transfer from the control device 12 to the control device 11, send that information to the Share Memo! It may also be written to J13k.

In this way, in this embodiment, the shared memory is divided into information transfer units, and route selection circuits 141 to 1 are assigned to each unit.
4h, and a selection state display circuit 15.4h accessible from the control device 11.12. ~15. By providing the shared memory 13., the shared memory 13. ~13.
．． The efficient control device 1 does not significantly reduce the processing capacity of the entire system due to difficulty in accessing the system.
Data can be transferred between 1.12 and 12.

〔Effect of the invention〕

As explained above, the present invention divides a shared memory into blocks for each information transfer unit, selects a specific control device from a group of control devices, and connects it to the shared memory of each block via a control bus. Since information is exchanged only between the selected control device and the shared memory of each block, it has the excellent effect of preventing the overall system processing ability from deteriorating even when the amount of information increases.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a block diagram of a conventional system, and FIG. 3 is a block diagram of another conventional system.

Claims (1)

[Claims] (1) In a system in which multiple control devices are each connected to a shared memory via a control bus and information is exchanged between each control device via the shared memory, the shared memory is divided into blocks for each information transfer unit. and a route selection circuit group that selects a specific control device from the control device group and connects it to the shared memory of each block via a control bus,
An information transmission control system characterized in that information is exchanged only between a control device selected by a route selection circuit and a shared memory of each block.