JPS63282852A - Stand-by system diagnosing system in duplex processing system - Google Patents

Abstract

PURPOSE:To easily transfer a diagnosed result and to easily execute program correction to be influenced upon a storing area of a main memory by storing the diagnosed result in an exclusive register. CONSTITUTION:When switching to a diagnosing mode is instructred from an operating system 100 to stand-by system 100' which is useally in a stopped state, a processor 101' of the system 100' connected to the system 100 through a bus 111 is separated from a bus 107', starts diagnising operation and stores the diagnosed result in a diagnosis information register 106' included in its system. At the time of ending the diagnosis, the end report inputted to the system 100 and a processor 101 in the system 100 accesses the register 106' in the system 100'. Consequently, the diagnosis operation based upon the preparatory system 100' set up to the stopped state at the time of normal operation can be executed at a format close to the practical operating formed and the diagnosed result also can be simply transferred to the operating system 100. Since the diagnosis information register is arranged independently of the data area in the memory, program correction can be easily executed.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a redundant control system, and in particular to a method for diagnosing a standby system that is normally in a stopped state among two processing systems that share a bus. Regarding.

[Conventional technology]

In the conventional duplex system, for example, NEC technical report Vo
Q, 38. P of Ncl (1985), 31-36, P
, 69-72, the diagnostic results of the standby system are transferred to the active system via the main memory.

[Problem that the invention seeks to solve]

For this reason, in the conventional system, although the content and amount of information of the diagnosis result can be set relatively freely, there is a problem in that the method of accessing the diagnosis result from the operating system and address management become complicated.

An object of the present invention is to facilitate diagnosis of a standby system in a dual system.

[Means for solving problems]

In the present invention, when the standby system, which is normally in a stopped state, is instructed to switch from the active system to the diagnostic mode, the processor of the standby system, which had been connected to the active system via a bus, is disconnected from the bus. , starts a diagnostic operation and stores the result in its own diagnostic information register. When the diagnosis is completed, a completion report is input to the active system, and the active system's processor accesses the standby system's diagnostic information register.

[Effect]

When the active system receives a signal indicating the completion of diagnosis from the standby system,
The standby system is returned to the stop mode and the diagnostic register is accessed via the bus.

By storing the diagnostic results in a dedicated register in this way, it becomes easier to transfer one diagnostic result, and since the diagnostic register is independent from the main memory, it is easier to modify programs that affect the storage area on the main memory. Become.

[Embodiments of the invention]

One embodiment of the present invention will be described below.

FIG. 1 shows an example of a duplex processing system.

This system consists of two processing systems 100° and 100', each of which includes a processor 101 (101)' that performs processing according to a program, and a memory 102 (102').
), active/standby switching mechanism 103 (103'), diagnostic control mechanism 104 (104'), watchdog timer 10
5 (105'), diagnostic information register 106 (106')
), a bus 107 (107'), and a bus control mechanism 108 (108') including a tri-state buffer.

The two processing systems 100 and L00' receive a bus 111. A dual system control signal 15o.

They are connected to each other by 151, 152, 153, and 154. If one processing system 100 is an active system, the other system 100
0' becomes the reserve system, and vice versa. Operating system 10
0 is operating normally, the processor of the standby system 100' is 1
In the 01' stop state, all controls <2 are in a rest state, and the data bus and address bus become high impedance. When starting up the system, the external switch 103 or 1 determines which of the above two processing systems will be the active system.
0H3' provides a selective oJ function. The terminal WDTOVF of watchdog tie v105, 105' is
The open collector generates an abnormality report signal for each prefecture as an output, and sends it to each switching mechanism 103, 1 via the signal line 150.
Input to the abnormality report input terminal EMA of 03'. The terminal ACT of the switching mechanism 103, 103' outputs a signal indicating whether the system is in an operating state or a stopped state, and this signal is connected to a signal line 15.
3 or 154, respectively, to the other system. The ACT signal is applied to the gate 110 or 110'
The signal is input to the bus control mechanism 108', 108 as a bus active signal via the bus control mechanism 108'. Diagnostic controller 4104
．． 104' c7) Terminals iN'L"M, 1NTN and signal lines 151, 152 are used for diagnosis mode setting, diagnosis startup, and diagnosis completion report. How to use these will be described later. In addition, in FIG. 1, block 160 indicates a processing target by the processing system, and 170 is a maintenance terminal device.

FIG. 2 shows the connection state between each processing system and the bus in a normal state. In this state, the active processor 101 can access the standby system 100' for writing, and only registers other than memory can be read. Note that the address when accessing the reserve system register 106' from the active system is different from the address when accessing the active system register 106.

FIG. 3 shows the bus connection state during the standby system self-diagnosis operation. In this state, (1) neither the active processor 101 nor the standby system 100' can be accessed; (2) the standby processor 101' is released from the idle state;
It is possible to read/write to the spare system register 106' and memory 102'. However, access to the active system 100 is not possible. Note that the standby system 100' enters the diagnostic mode when it receives an interrupt signal of i N TM =ON from the active system 100.

FIG. 4 shows an operation flow during diagnosis of the active system and the standby system, and FIG. 5 shows a signal time chart.

The procedure for diagnosing the active system to the standby system will be described below with reference to these drawings. The diagnostic program resides in the memory of each prefecture.

(1) In the normal state, the active system 100 uses the I N
Turn on the TM signal. As a result, the INTM signal is input to the diagnostic control mechanism 104' of the standby system 100', the diagnostic mode is set in terms of hardware, and the processor 101'
An interrupt occurs.

The active system 100 receives the completion report (iNT
N=ON) Waiting.

(2) When the diagnostic mode is set, the standby system uses bus 111.
(Fig. 3), and the stopped state is released. Further, a diagnostic program is started by an interrupt. Diagnosis targets include instruction tests of the processor itself, memory tests, and tests of other groove control parts. These diagnostic results are stored in the diagnostic information register 106', and when the diagnosis is completed, the i NTM signal is turned ON, and then the 1DL
Becomes E state.

(3) When the standby system turns i NTM =ON, the I NTN signal indicating the end of diagnosis is input to the active system 100, and an interrupt is generated in the processor 101. In the operation system interrupt processing, IN'TM is first turned OFF to cancel the diagnostic mode. After this, the backup system diagnostic information register 106'
and process the diagnostic results. In the above configuration, the active system and the standby system execute different interrupt processing in response to the input of the I N TN signal, but the processing contents differ depending on whether each processing system is the active system or the standby system. This is because it is designed to be switched.

(4) When the backup system 100' is released from the diagnostic mode,
The processor 101' is stopped and automatically turns on the iNT.
The M signal turns OFF.

(5) If the active system does not receive a diagnosis completion report from the standby system within a specified time, it determines that there is an abnormality in the standby system and performs predetermined processing.

According to this embodiment described above, it is possible to perform diagnosis in a form close to the actual operating mode even for a system that normally does not operate, and all operations such as command input and result display are performed on an operating system. This makes it easier for maintenance personnel to operate the system. Furthermore, since the diagnostic information is stored in a dedicated register independent of the data area on the memory, there is no need to change the address by modifying the program.

〔Effect of the invention〕

According to the present invention, the diagnostic operation of the standby system, which is stopped rhL during normal operation, can be performed in a form close to the actual operating mode, and the diagnosis results can be easily transferred to the active system.

Furthermore, since the diagnostic information register is independent from the data area on the memory, program modification becomes easy.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram of a redundant processing system according to the present invention, Fig. 2 is a diagram showing the connection state between each processing system and the bus in the normal state, and Fig. 3 is a diagram showing the connection state of each processing system and the bus in the diagnostic mode. FIG. 4 is an operation flowchart of the active system and standby system during diagnosis, and FIG. 5 is a signal time chart of the active system and standby system during diagnosis. 101... Processor, 102... Memory, 103
... Active system/standby system switching mechanism, 104... Diagnosis control mechanism, 105... Watchdog timer, 106.
...Diagnostic information register, 107, 111...Bus, 1
08...Bus control mechanism, 150-154...Double system control signal line, 160...Processing object, 170...Maintenance terminal. Agent Patent Attorney Katsuo Ogawa ゛Y l Mouth No. 2I! ] 3rd I! 1. 4. dent.

Claims (1)

[Claims] 1. In a redundant processing system where one of two processing systems that share a system bus operates as an active system, the other becomes a standby and waits in a stopped state.
A register for each of the above processing systems to store diagnostic information,
comprising a processor, a main memory, and switching means for connecting or disconnecting these elements from the system bus,
When the diagnostic mode setting signal is given from the active system to the standby system, the standby system starts diagnostic operation independent of the system bus, and sends the diagnostic end signal to the active system with the diagnostic result stored in the above register. and after the active system releases the diagnostic mode setting of the standby system in response to the diagnostic end signal,
A standby system diagnostic method in a redundant processing system, characterized in that the diagnostic register is accelerated.