JPS6249463A - Patching system of input output controller - Google Patents

Abstract

PURPOSE:To make patching easily without interruption and to continue suspended inputting and outputting operation when writing is completed by switching the state of access by an access switching circuit and writing patch data directly in a control storage section by a DMA circuit. CONSTITUTION:On receiving a command to input and output, an input output processor 6 takes out control programs A-C corresponding to input output devices 3-5 from a control storage section 7, and makes input output control by executing control programs taken out. A command to write is given to a DMA circuit 10 through a signal line a by depressing a writing switch 27 and making it on. On receiving request for writing from the DMA circuit 10, an access switching circuit 8 sets the state of a signal line C to '1', and starts the DMA circuit 10 through a signal line d. The DMA circuit 10 writes the content set by data switches 19-26 in specific addresses of the control storage section 7 designated by address switches 11-18 in a control panel 9.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a patch method for an input/output control device that allows easy patching of an input/output control program.

[Conventional technology]

Conventionally, in an input/output control device, a patch is executed on an input/output control program stored in a control storage unit in the following manner. That is, first, an interrupt is applied to the turnout processor in the input/output control device from a control panel provided in the input/output control device. The interrupted turnout processor executes a program for the control panel.

By executing this program, data provided through the control panel is patched.

[Problem that the invention seeks to solve]

As mentioned above, the conventional patching method for input/output control devices involves interrupting the input/output control processor from the control panel, causing the input/output control processor to execute the control panel program, and storing the data from the control panel in the control memory. It was configured to write to the section. Therefore, if a patch is performed, the state of the input/output control processor changes due to the interrupt, and the input/output operation that was being performed before the interrupt cannot be continued.

In particular, when patching an input/output control program that controls other input/output devices while a host device is using a specified input/output device, all running input/output devices will be stopped. This has the disadvantage that it cannot be easily patched.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and to provide a patch method for an input/output control device that allows input/output control programs to be easily patched.

[Means for solving problems]

A patch system for an input/output control device according to the present invention includes at least two or more types of input/output devices, a control storage section that stores a control program for operating each of the input/output devices,
an input/output control unit that controls the input/output device according to the control program; a control panel that specifies an address in the control storage unit and data to be written; A write control unit that directly writes the data to an address, and an access switching unit that switches access from the write control unit and the input/output control unit to the control storage unit, and when a write instruction is output from the control panel. , the access switching means stops access from the input/output control section to the control storage section and starts access from the write control section to the control storage section.

〔Example〕

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

FIG. 1 shows a block diagram of an input/output control device according to the present invention. In the figure, 1 is the input/output control device, 2 is the upper position, 3.4
．． Reference numeral 5 indicates various input/output devices attached to the input/output control device 1 (normally, the input/output control device 1 receives instructions from the host device 2, and controls the operations of the input/output devices 3, 4.5 as appropriate. The number of attached input/output devices is generally plural, but in this embodiment, it is three.

Inside the input/output control device 1, a turnout processor 6 and a control storage section 7 are provided. The human output processor 6 is connected to the host device 2 and the input/output devices 3, 4.5 via a bus, and the input/output processor 6 and the control storage section 7 are connected via an access switching circuit 8 via a bus. Further, a signal line C is connected from the access switching circuit 8 to the turnout processor 6. On the other hand, inside the control storage section 7, three types of control programs A, B, and C corresponding to each of the input/output devices 3, 4, and 5 are stored.

The input/output control device 1 includes a control panel 9 disposed externally. The control panel 9 has eight address switches 11
-18, eight data switches 19-26, and one write switch 27. These switches are operated externally. 10 is DMA (direct memory)
The DMA circuit 10 is connected to the control panel 9 and the access switching circuit 8 via a bus.

Further, a signal line a for writing instructions is provided between the control panel 9 and the DMA circuit 10, and signal lines S and d are provided between the DMA circuit 10 and the access switching circuit 80.

Next, the operation will be explained. From the host device 2 to the input/output device t3,
When there is an input/output instruction for 4.5, the people output processor 6 retrieves control programs A, B, and C corresponding to the input/output devices 3 and 4.5 from the control storage unit 7, and executes the retrieved control programs. By doing this, input/output control is performed.

In this case, the signal line C is in the "0" state,
Enables input/output control access by the turnout processor 6.

In the above state, a patch is executed for any one of the control programs A, B, and C stored in the control storage section 7. First, address switches 11-18 and data switches 19-26 provided on control panel 9 are set to predetermined states. After this, the write switch 27 is pressed down and turned on. As a result, a write instruction is issued to the DMA circuit 10 via the signal line a. Next, the DMA circuit 10 connects the control storage unit 7 to the access switching circuit 8 via a signal line.
request access to. The access switching circuit 8 is a DM
When a write request is received from the A circuit IO, the state of the signal line C is set to "1" to instruct the input/output processor 6 to prohibit access for input/output control, and then the DMA circuit is sent to the DMA circuit via the signal line d. 10.

In response to this activation command, the DMA circuit 10 performs an operation of writing the contents set by the data switches 19 to 26 to a specific address of the control storage unit 7 specified by the address switches 11 to 18 on the control panel 9. .

When the writing to the control storage section 7 is completed, the access switching circuit 8 sets the state of the signal line C to "0", thereby enabling the turnout processor 6 to access the control storage section 7. . Therefore, the input/output processor 6 resumes access to the control storage unit 7 that had been interrupted by the patch, and the input/output devices 3, 4, .
5 continues to control input/output operations.

According to the above configuration, in the input/output control device 2, the control program Δ is stored in the control storage section 7.

When patching B and C using the control panel 9, instead of interrupting the input/output processor 6 to execute the patch, the DMA circuit 10 executes the patch in the control storage section 8.
Patch data can be written directly to.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, when patching is performed from the control panel of an input/output control device, the access switching circuit is activated to switch the access state,
Since the patch data is written directly into the control storage unit by the MA circuit, it is possible to easily patch the input/output control program without interrupting the turnout processor, and the program is not interrupted once the writing is completed. This has the advantage that input/output operations by the input/output processor can be performed continuously.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing one embodiment of the present invention.

Claims (1)

[Claims] (1) At least two or more types of input/output devices, a control storage section that stores a control program for operating each of the input/output devices, and an input/output control section that controls the input/output devices according to the control program. The input/output control device includes: a control panel that specifies an address in the control storage unit and data to be written; a write control unit that directly writes the data to the address specified by the control panel; comprising access switching means for switching access from the input/output control unit to the control storage unit, and when a write instruction is output from the control panel,
A patch system for an input/output control device, wherein the access switching means stops access from the input/output control unit to the control storage unit and starts access from the write control unit to the control storage unit.