JPS643701A - Back-up device - Google Patents

Back-up device

Info

Publication number
JPS643701A
JPS643701A JP15763387A JP15763387A JPS643701A JP S643701 A JPS643701 A JP S643701A JP 15763387 A JP15763387 A JP 15763387A JP 15763387 A JP15763387 A JP 15763387A JP S643701 A JPS643701 A JP S643701A
Authority
JP
Japan
Prior art keywords
relay
output
run
external
contact
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP15763387A
Other languages
Japanese (ja)
Other versions
JPH083721B2 (en
Inventor
Tatsuo Fujiwara
Ryoichi Abe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP15763387A priority Critical patent/JPH083721B2/en
Publication of JPS643701A publication Critical patent/JPS643701A/en
Publication of JPH083721B2 publication Critical patent/JPH083721B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Landscapes

  • Safety Devices In Control Systems (AREA)

Abstract

PURPOSE:To facilitate the wiring set between a main device and a spare device at the time of a back-up operation and at the same time to omit an external auxiliary relay, by securing connection between a RUN circuit of the main device and an output inhibiting circuit of the spare device by an external wiring. CONSTITUTION:A PUN contact 7 of a 1st electronic device PC1 is connected to the external terminals Ta' and Tb' of an output inhibiting relay 9; of a 2nd electronic device PC2 with wires 16. When the abnormality is detected by a watchdog timer circuit, etc. of an arithmetic processing part of the PC1, a RUN relay-off command is outputted to an output latch of of the arithmetic processing part and a RUN relay 6 of the PC1 is not energized with a RUN contact X1a opened. Thus an output relay group 8 is not energized and at the same time a constantly closed contact X2b, of the relay 9' of the PC2 is closed. Then the power is supplied to an output relay group 8' of the PC2 and an external output device 11 is driven by the PC2. In such a way, the PC2 starts automatically when the PC1 has abnormality and therefore a system can work with no downtime when the PC1 is switched to the PC2.
JP15763387A 1987-06-26 1987-06-26 Backup device Expired - Lifetime JPH083721B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15763387A JPH083721B2 (en) 1987-06-26 1987-06-26 Backup device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15763387A JPH083721B2 (en) 1987-06-26 1987-06-26 Backup device

Publications (2)

Publication Number Publication Date
JPS643701A true JPS643701A (en) 1989-01-09
JPH083721B2 JPH083721B2 (en) 1996-01-17

Family

ID=15653985

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15763387A Expired - Lifetime JPH083721B2 (en) 1987-06-26 1987-06-26 Backup device

Country Status (1)

Country Link
JP (1) JPH083721B2 (en)

Also Published As

Publication number Publication date
JPH083721B2 (en) 1996-01-17

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