JPS6039964A - Test system of emergency control circiut - Google Patents

Abstract

PURPOSE:To attain the test while being mounted to the device by strating an emergency control circuit and transmitting a control signal in the state that the transmission of control signal of the emergency control circuit is blocked to an external device. CONSTITUTION:Since gates Gl-Gn are conductive while no test is conducted, the control signal transmitted via lines ll-ln from an emergency control section EMA is inputted to central controllers CC0-CC1, where the signal is controlled according to the content. When a start signal ST is fed from the central controllers CC0, CC1, detection of a fault by a fault supervising circuit and keys on a console or the like, a start reception flip-flop FF2 is set, the gates Gl-Gn are made nonconductive, an emergency control section EMACNT is started,the control signal is transmitted in a prescribed timing from the lines l1-ln depending on the state of system constitution and a prescribed control is attained. When the processing is finished, the FF2 is reset, then the system restarts the operation.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a test method for an emergency control circuit, and more particularly, to a test method for an emergency control circuit that allows testing while attached to a device.

Prior Art and Problems In a stored program controlled telephone exchange, such as the D-10 type, it is possible to deal with all normal failures through program-based processing.

However, when the system falls into a programmatically unrecoverable state, an emergency control circuit is provided to automatically restore the system configuration to a normal operating system configuration. When the emergency control circuit is activated from the console or from the console due to a system failure, the emergency control circuit sends various control signals to the central control unit to reconfigure the system.

In the above-mentioned switching equipment, the basic devices constituting the system, ie, the central control unit, the main storage device, etc., are duplicated for operational reliability. For example, if we consider a case where two central control units (CCo, CC1) and two main memories (MM o, MM l) are provided, the system will be in one of the following four states. configured. That is, for example state 0
, 1, 2.3 respectively CC01MM1# CCo
, MMo; CCt IMMI; CC1,■b;
The combination of CC1, MMo: CC+,
The system is configured with the combination of MMI: CCo, MMo; CCo1MM1; as a backup.

When the emergency control circuit is activated, various control signals are sent to the active and standby central control units, and the above-mentioned steps 0.
1, 2.3 are configured in sequence, IPL (initial program load) and other processing are performed in each state, and when a state that is confirmed to operate correctly is reached, the system is configured in this state. Then, system operation can be resumed.

The conventional system was configured as described above, so when the emergency control circuit is activated, the system is reconfigured.
In a system where the central control unit, main memory, etc. are duplicated as described above, the connection configuration of the central control unit and main memory changes, which has a serious effect on system operation, so the emergency control circuit It was not possible to start up the system while it was attached to the device (system), making it impossible to test the emergency control circuit.

It is possible to duplicate the emergency control circuit to enable testing of the emergency control circuit and ensure reliability, but this would require extremely complicated control during system reconfiguration due to abnormality detection.
Actually it's not possible.

OBJECTS OF THE INVENTION It is an object of the present invention to make it possible to easily test an emergency control circuit with the emergency control circuit installed in a device (system) without affecting the system in terms of configuration or the like.

Examples of the invention Embodiments of the present invention will be described below with reference to the drawings.

The figure is a block diagram showing an outline of the configuration of an emergency control circuit embodying the present invention. In the figure, CCo.

CC, indicates all central controllers in the system, and E
MA indicates an emergency control circuit. Furthermore, EMA CNT ii
The emergency control unit in the emergency control circuit EMA is represented by: REG is a register, G1 to G are gates, FF+ is an emergency operation prohibition flip-flop that constitutes an emergency operation prohibition circuit, FF++ is a startup reception flip-flop, and ST is an emergency control circuit E. -M
This is the activation signal of A. IRo, IR+ are registers RE
Central control unit CCo + CC for data read from G
This is an input terminal to 1.

If the emergency control circuit EMA is not tested, the emergency operation prohibition flip-flop FF should be in the reset state.
The gates G1 to Gn receiving the cutting edge are in a conductive state.

The emergency control unit EMACNT is provided with a plurality of lines 1h-Jn, through which control signals from the emergency control circuit EMA to the respective central control units CCo and CC+ are sent. Line i! l
~ln are divided into two after passing through G+~Gn, respectively, and each reaches the input terminals ILo, II, + of the central control units CCo, CC1. When a test is not being performed, G+-Gn is conductive as described above, so the control signal sent through the emergency control unit EMA CNT wires 11 to In is input to the central controllers CCo and CC1. It is controlled according to its contents.

The control signals include signals for stopping the operation of the central controller, system configuration (stay), IPL circuit control, starting the central controller, and the like.

Central control bag/placement CCo, CC1 and abnormality monitoring circuit (E
When an abnormal state of SE) is detected and a start signal ST is given by operating a telephone key on the console, the start acceptance flip-flop FF2 is set, and its output becomes ``1'' and is input to the emergency control unit EMA CNT. and start this,
Control signals are sent from lines 11 to ln at a predetermined timing depending on the state of the system configuration set at that time (for example, state O). Ru.

This signal is branched into the central control units CCo and CC for predetermined control.

When this process is completed, the emergency control unit EMA, CNT activates the activation acceptance flip-flop FF2. Reset.

Here, if the system starts up normally, the start signal ST disappears, so the system can restart the processing operation.

If the system cannot be reconfigured normally and cannot be started normally, a start signal ST is further sent out and the start acceptance flip-flop FF2 is set again. When the emergency control unit EMA CNT receives the activation of the activation reception flip-flop FF2, it advances the state carantara (not shown) and advances the number indicating the state by one (for example, if the previous state was 0, this time it is state 1).
, performs reconfiguration according to the new state (stay 1). If the system starts up normally in this state 1 configuration, the start signal ST disappears, but if it does not start up normally, the start signal ST does not disappear, and the start acceptance flip-flop FF2 is set, and the system advances to state 2 and restarts. Configure.

In this way, if all states
0.1.2.3), if reconfiguration is not possible and the system does not start up normally, it will be displayed to the maintenance personnel.

According to the present invention, in order to test the emergency control circuit EMA, a program for testing the emergency control circuit EMA is stored in the main storage device (not shown) Mo, MMx, and the test is performed using this program.

Now, assume that the above trial M program is started in the spare central control unit CC1.

This program operates according to a flow consisting of the following steps.

Step 1: Send an output to the output terminal 11 of the central controller CC1 and set it to the emergency operation prohibition flip-flop FF+ of the emergency operation control circuit EMA. This is sig)G
x-Gn becomes non-conductive.

Step 2: Intentionally generate the activation signal ST'(z) of the emergency operation control circuit EMA by setting TF overflow in the own central control unit CC+.

Step 3: Disable program interrupts (class A and B interrupts) within the own central control unit CCI.

Step 4 By the operation of step 2, the activation acceptance flip 70 block FF2 is set by the activation signal ST, and the emergency control unit EMACNT is activated by its output.

Step 5: Emergency control unit EMA CNT lines 11~zn
Then, a control signal is sent out at a predetermined timing in accordance with the state set at that time. However, at this time, since the gates Gl-Gn are non-conductive, the central controllers CCo and CC1 do not receive these control signals.
Not affected by it.

Step 6: The above control signal is sent to register BEG and latched.

Step 7: Release the prohibition of interrupts (class A and B interrupts) by the program in the central control unit CC1.

Step 8: The output OE of the emergency control unit EMA CNT, the emergency operation prohibition flip-flop FF and the activation acceptance flip-flop FF2 are reset.

Step 9: The central controller CC1 registers the register R-EC.
The data stored in the test program is read out through the input terminal IRI, compared with the correct data prepared in advance in the test program, a match is detected, and the result is written into the linked main memory.

In step 10, the operation in step 4 is performed. During the operation in step 4, a state counter (not shown) is incremented by one step, and in step 5, a control signal corresponding to the incremented state is sent out. Further, steps 6 to 10-
Hit the action at 1'. This is repeated to complete the processing in each state.

Step 11: The central control unit ccl reads the test results for each status from the main memory and displays them on the console, for example, to complete the test.

Although the present invention has been described above in the case where the central control device is duplicated, the present invention is not limited to the case where the central control device is duplicated, but can be similarly implemented in the case of a single central control device.

Effects of the Invention Since the present invention is configured as described above, it has the following advantages:
This has the effect of making it possible to test the emergency control circuit while it is attached to the device. When testing emergency control circuits, the impact on the central control unit, etc. is extremely small, and in systems with dual central control units, tests can be performed from either central control unit. There is little effect on the other central control unit during the test.

[Brief explanation of drawings]

The figure is a block diagram showing the configuration of an embodiment of the present invention. CCo, CCr...Central control unit, EMA...Emergency control circuit, FF+...Emergency operation prohibition flip-flop, FF2...Start acceptance flip-flop, REG...
-Register, Gl~Gn...gate. License applicant Fujitsu Limited

Claims (1)

[Claims] The emergency operation prohibition circuit comprises a gate provided in a control signal transmission path of the emergency control circuit, an emergency operation prohibition circuit that controls the gate to be non-conductive, and a register that latches the control signal sent from the emergency control circuit. is activated to make the gate non-conductive and prevent the emergency control circuit from transmitting the control signal to the outside, start the emergency control circuit, transfer the control signal to the register, latch it there, and then A test method for an emergency control circuit characterized by comparing data latched in the register with correct data prepared in advance.