JPS6246896B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a peripheral control device in a duplex system and a switching control device for controlling switching of peripheral devices, and particularly relates to an improvement for facilitating testing of the switching control device.

Conventionally, a switching control device of a duplex system is connected to first and second central processing units, and controls switching of a switching device of a peripheral switching device connected to the first and second central processing units. During control, the state transition of the changeover switch is reported to the two central processing units. Therefore, when testing the switching control device, reports are sent to the two central processing units in the same way as described above, so the test program for the switching control device is executed on the two central processing units and is synchronized with each other. It is necessary to proceed with the exam while taking the following. Therefore, the test program for the switching control device has a disadvantage in that the logic is complex and requires a large number of steps in order to regulate synchronization between the two central processing units, which significantly increases the number of man-hours required to develop the test program. There is.

The purpose of the present invention is to solve the above-mentioned conventional drawbacks and
To provide a switching control device that can perform a test using one program on only one central processing unit by reporting processing results only to the central processing unit that issued the command during testing. be.

The switching control device of the present invention performs connection switching control of peripheral devices commonly connected to first and second central processing units via a switch in accordance with a control command from one of the central processing units. A switching control device that reports a connection state after switching control to the other central processing unit, comprising an information destination determining unit configured to send an output to the central processing unit that has issued the test mode switching control command, This information destination determining section is characterized by including a first gate that is opened in the normal mode and closed in the test mode, and a second gate that is closed in the normal mode and opened in the test mode.

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

The figure is a logic circuit diagram showing one embodiment of the present invention. That is, the switching control device 1 of this embodiment is connected to the first and second central processing units 2 and 3, and performs peripheral switching according to a command from the first central processing unit 2 or the second central processing unit 3. The device 4 is controlled to switch and connect the peripheral devices 5 and 6. The switching control device 1 includes a command execution section 11, information destination determining sections 12 and 13, and output data drivers 14 and 15. The command execution unit 11 is connected to the first central processing unit by a bus cable 21, and to the second central processing unit 3 by a bus cable 31, and is connected to the first central processing unit 3 by a bus cable 31, and executes commands according to switching commands from the respective central processing units. It executes switching control of the peripheral switching device 4, issues a switching instruction to the switch control unit 41, and upon receiving an execution result report from the switch control unit 41, outputs a control command completion report and a caution report. The completion report is sent to the bus cable 21 via the completion report line 111 and the output data driver 14, and is sent to the bus cable 31 via the completion report line 112 and the output data driver 15. The caution report is sent to the caution report line 113 or 114.

Attention report line 113 is connected to the inputs of AND gates 124 and 125, and the other inputs of AND gates 124 and 125 are connected to the positive and negative outputs of flip-flop 121, respectively. Flip-flop 121 is triggered by command execution section 11 and its positive output is logic "1" in normal mode and logic "0" in test mode. In this embodiment, the AND gate 124 is the first gate that is normally open and closed during the test mode, and the AND gate 125 is the second gate that is normally closed and opened during the test mode. That is, AND gates 124, 125 and flip-flop 1
21 constitutes an information destination determining section, the output signal of the AND gate 124 is sent to the bus cable 31 via the output data driver 15, and the output of the AND gate 125 is sent to the bus cable 21 via the output data driver 14. Sent out. The AND gates 134, 135 and the flip-flop 131 similarly constitute the information destination determining section 13, and the output of the AND gate 134 (first gate) is sent to the driver 14.
to the bus cable 21 via the AND gate 13
5 (second gate) is sent to the bus cable 31 via the driver 15.

Next, the operation of this embodiment will be explained. In the normal mode, for example, a switching command for switching the peripheral switching device 4 from the first central control device 2 is given to the command execution unit 11 via the bus cable 21. As a result, the command execution section 11 issues a switch switching instruction to the switch control section 41. The switch control unit 41 switches the switch 42 according to the instruction and reports the execution result to the command execution unit 11.
Upon receiving the above report, the command execution unit 11 outputs a completion report to the completion report line 111 and sends the completion report to the first central processing unit 2 via the output data driver 14 and the bus cable 21. Next, a caution report signal is sent to the caution report line 113, passed through the AND gate 124, and sent to the second central processing unit 3 via the output driver 15 and bus cable 31 to notify the connection state of the changeover switch. The above operation is similar to that of a conventional switching control circuit.

Next, when the first central processing unit 2 executes the test program of the switching control device, when a test mode transition command is output from the first central processing unit 2 to the bus cable 21, the command execution unit 11 Trigger flip-flop 121 to make its output logic "0". Therefore, AND gate 124 is closed and AND gate 125 is opened. At this time, the flip-flop 131 is in the same state as in the normal mode, and its output logic remains at "1". next,
When a switching command is issued from the first central processing unit 2, the command execution unit 11 executes the command, sends a completion report indicating the end of the control command to the completion report line 111, and sends a completion report to the output data driver 14 and the bus cable. A completion report is sent to the first central processing unit via 21. Next, a caution report is sent to the caution report line 113, and the AND gate 125 and the output data driver 1
A warning report is sent to the first central processing unit 2 via the bus cable 21 and the bus cable 21. This allows the first central processing unit 2 to check the status of the switch as a result of execution, and check the quality of the switching control. Meanwhile, now, and gate 1
24 is closed, the above caution report is the second one.
It is not sent to the central processing unit 3.

When testing the switching control device 1 from the second central processing unit 3, the flip-flop 131 is set to the test mode and the AND gate 1 is tested, as described above.
34 is closed and AND gate 135 is opened. At this time, all completion reports and caution reports are sent to the second central processing unit, and nothing is reported to the first central processing unit.

As described above, in the present invention, the first and second gates are provided which can be switched between the normal mode and the test mode, and in the test mode, the test mode is terminated only for the central processing unit that has issued the test mode entry command. Since it is configured to perform reports and warning reports, it is possible to test the present switching control device using only one central processing unit. Therefore, the logic of the test program becomes simple, which has the effect of reducing the number of steps required to develop the test program.

[Brief explanation of the drawing]

The figure is a logic circuit diagram showing an embodiment of the present invention. In the figure, 1... switching control device, 2... first
central processing unit, 3... second central processing unit, 4
... Peripheral switching device, 5, 6 ... Peripheral device, 12,
13... Information destination determining unit, 14, 15... Output data driver, 21, 31... Bus cable,
111,112...Completion report line, 113,114
...Caution report line, 121,131...Flip-flop, 124,125,134,135...And gate.

Claims (1)

[Claims] 1. Controlling the switching of the connection of peripheral devices commonly connected to the first and second central processing units via a switch in response to a control command from one of the central processing units; In the switching control device that reports the connection state after control to the other of the two central processing units, the information destination determining unit 1 is configured such that the output is sent to the central processing unit that issued the test mode switching control command.
2, 13, and this information destination determining unit includes first gates 124, 134 that are opened in the normal mode and closed in the test mode, and a second gate 125, which is closed in the normal mode and opened in the test mode. 135. A switching control device comprising: