JPS55102062A - Fail safe system - Google Patents

Fail safe system

Info

Publication number
JPS55102062A
JPS55102062A JP902179A JP902179A JPS55102062A JP S55102062 A JPS55102062 A JP S55102062A JP 902179 A JP902179 A JP 902179A JP 902179 A JP902179 A JP 902179A JP S55102062 A JPS55102062 A JP S55102062A
Authority
JP
Japan
Prior art keywords
outputted
pulse
shift register
control signal
output
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.)
Pending
Application number
JP902179A
Other languages
Japanese (ja)
Inventor
Saburo Kamei
Kyoji Kameo
Masamichi Hashimoto
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP902179A priority Critical patent/JPS55102062A/en
Publication of JPS55102062A publication Critical patent/JPS55102062A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To enable to avoid runaway by inhibiting the operation of controlled unit with control signal, through the inhibition of the output of enable signal when the output OFF is detected from the watchdog timer.
CONSTITUTION: When the computer system 1 receives the control signal output instruction, the control signal A is outputted. In this case, the enable signal B and the pulse D from the watchdog timer are simultaneously outputted. The enable signal B is inputted to the two-stage shift register 2 and the pulse D is inputted to the two-stage shift register 2 and the detector 3. When the pulse D is normally outputted from the two-stage shift register 2, the enable signals C1WC2 are sequentially outputted. If program runaway is taken place due to some causes, the pulse D is not outputted. When the detector 3 detects it, the signal E is outputted to inhibit the output from the shift register 2. Accordingly, no controlled unit is operative even with the control signal instruction received.
COPYRIGHT: (C)1980,JPO&Japio
JP902179A 1979-01-29 1979-01-29 Fail safe system Pending JPS55102062A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP902179A JPS55102062A (en) 1979-01-29 1979-01-29 Fail safe system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP902179A JPS55102062A (en) 1979-01-29 1979-01-29 Fail safe system

Publications (1)

Publication Number Publication Date
JPS55102062A true JPS55102062A (en) 1980-08-04

Family

ID=11708993

Family Applications (1)

Application Number Title Priority Date Filing Date
JP902179A Pending JPS55102062A (en) 1979-01-29 1979-01-29 Fail safe system

Country Status (1)

Country Link
JP (1) JPS55102062A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57176237A (en) * 1981-04-18 1982-10-29 Toyoda Automatic Loom Works Monitoring of micro-computer in loom
US4608492A (en) * 1983-05-19 1986-08-26 Teledyne Industries, Inc. Ultraviolet monitor suntan alarm with self test routines
JPS63258228A (en) * 1987-04-16 1988-10-25 Honda Motor Co Ltd Control circuit of constant speed travel device for vehicle
JPS63258229A (en) * 1987-04-16 1988-10-25 Honda Motor Co Ltd Control circuit of constant speed travel device for vehicle

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57176237A (en) * 1981-04-18 1982-10-29 Toyoda Automatic Loom Works Monitoring of micro-computer in loom
US4608492A (en) * 1983-05-19 1986-08-26 Teledyne Industries, Inc. Ultraviolet monitor suntan alarm with self test routines
JPS63258228A (en) * 1987-04-16 1988-10-25 Honda Motor Co Ltd Control circuit of constant speed travel device for vehicle
JPS63258229A (en) * 1987-04-16 1988-10-25 Honda Motor Co Ltd Control circuit of constant speed travel device for vehicle

Similar Documents

Publication Publication Date Title
JPS5450329A (en) Copier control device using plural micro-computers
JPS55102062A (en) Fail safe system
JPS5340239A (en) Computer system
ES8405174A1 (en) A timing control system in a data processor.
JPS5487145A (en) Display system for data comparison and agreement
JPS54162940A (en) Computer supervisory device
JPS5279736A (en) Memory error detecting control system
JPS56157504A (en) Control device
JPS54116969A (en) Time limit device
JPS54162929A (en) Sheet cut control system
JPS537165A (en) Synchronism detecting circuit of phase control circuit
JPS56155453A (en) Program execution controlling system
JPS54134289A (en) Device for protecting nuclear reactor
JPS55102054A (en) Failure informing system
JPS55131855A (en) Transmission protection system for control signal
JPS5621258A (en) Failure storage system in central processing unit
JPS55116104A (en) Sequential controller
JPS5431801A (en) Boiler primary steam temperature control system
FR2363153A1 (en) Electronic burglar alarm circuit - triggers alarm if signal is not inhibited within preset time of initiation
JPS5619129A (en) Input and output control unit having spare processor
JPS5667418A (en) Moving body control system
JPS53106599A (en) Ultrasonic alarm device
JPS5388548A (en) Diagnosis control system
JPS5451741A (en) Input/output control system
JPS5557961A (en) Annunciator