JPS5638645A - Digital output change-over system in duplex system - Google Patents

Digital output change-over system in duplex system

Info

Publication number
JPS5638645A
JPS5638645A JP11296279A JP11296279A JPS5638645A JP S5638645 A JPS5638645 A JP S5638645A JP 11296279 A JP11296279 A JP 11296279A JP 11296279 A JP11296279 A JP 11296279A JP S5638645 A JPS5638645 A JP S5638645A
Authority
JP
Japan
Prior art keywords
output
computer
over
switching
main system
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
JP11296279A
Other languages
Japanese (ja)
Inventor
Yurio Yoku
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 JP11296279A priority Critical patent/JPS5638645A/en
Publication of JPS5638645A publication Critical patent/JPS5638645A/en
Pending legal-status Critical Current

Links

Landscapes

  • Hardware Redundancy (AREA)
  • Multi Processors (AREA)

Abstract

PURPOSE: To enable continuous change-over not causing chattering, by holding the output of main system at the digital output change-over from the main system to the waiting system and delaying the switching timing longer than the sampling period of computer.
CONSTITUTION: The computer 1, digital input unit 2, CPU3 and digital output unit 4 are respectively constituted with the duplex system A, B, the output of the failure output units 12A, 12B is input to the switching discrimination circuit 10 to control the switching unit 6 via the timer 20. In this case, if failed output is given to the computer of the main system, the output of the computer of the main system stored for a longer period than the sampling period of the computer at least, is outputted as it is, and after the period is elapsed, the switching to the output of waiting system can be made. Thus, the continuous change-over not causing chattering to the output can be made.
COPYRIGHT: (C)1981,JPO&Japio
JP11296279A 1979-09-05 1979-09-05 Digital output change-over system in duplex system Pending JPS5638645A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11296279A JPS5638645A (en) 1979-09-05 1979-09-05 Digital output change-over system in duplex system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11296279A JPS5638645A (en) 1979-09-05 1979-09-05 Digital output change-over system in duplex system

Publications (1)

Publication Number Publication Date
JPS5638645A true JPS5638645A (en) 1981-04-13

Family

ID=14599888

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11296279A Pending JPS5638645A (en) 1979-09-05 1979-09-05 Digital output change-over system in duplex system

Country Status (1)

Country Link
JP (1) JPS5638645A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07107762A (en) * 1994-06-15 1995-04-21 Canon Inc Apparatus provided with oscillatory-wave driving
JP2021033600A (en) * 2019-08-23 2021-03-01 三菱電機株式会社 Digital output device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07107762A (en) * 1994-06-15 1995-04-21 Canon Inc Apparatus provided with oscillatory-wave driving
JP2021033600A (en) * 2019-08-23 2021-03-01 三菱電機株式会社 Digital output device

Similar Documents

Publication Publication Date Title
JPS55129847A (en) Access system of memory unit
JPS5325324A (en) Address selection system
JPS57195397A (en) Locally doubled storage device
JPS5638645A (en) Digital output change-over system in duplex system
JPS5614302A (en) Process control system
JPS55129818A (en) Error processing system in terminal unit
JPS5336439A (en) Information processor
JPS5599655A (en) Branch control unit
JPS55119724A (en) Priority selection circuit
JPS5337A (en) Control system for input/output unit
JPS5627429A (en) Bus control system
JPS5438732A (en) Input/output order accepting system
JPS5232645A (en) Multiplexer
JPS5635067A (en) Test system for input and output unit
JPS526040A (en) Input output control system
JPS5380929A (en) Memory unit
JPS5422074A (en) Switching control system
JPS5616221A (en) Control system for data transfer
JPS5346243A (en) Processor control system
JPS54137940A (en) Multi-data processor
JPS5419615A (en) Control system for input and output unit
JPS5752902A (en) Output collation system for digital controller
JPS57174725A (en) Interruption controlling system
JPS5316540A (en) Bus switching unit for electronic computer
JPS5638601A (en) Multiplex control unit