JPS6441002A - Countermeasure device for abnormality of programmable controller - Google Patents

Countermeasure device for abnormality of programmable controller

Info

Publication number
JPS6441002A
JPS6441002A JP19639087A JP19639087A JPS6441002A JP S6441002 A JPS6441002 A JP S6441002A JP 19639087 A JP19639087 A JP 19639087A JP 19639087 A JP19639087 A JP 19639087A JP S6441002 A JPS6441002 A JP S6441002A
Authority
JP
Japan
Prior art keywords
abnormality
data
reference data
control subject
time
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
JP19639087A
Other languages
Japanese (ja)
Inventor
Akinori Nagai
Yasusuke Sakurai
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
Hitachi Plant Technologies Ltd
Original Assignee
Hitachi Techno Engineering Co Ltd
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 Techno Engineering Co Ltd, Hitachi Ltd filed Critical Hitachi Techno Engineering Co Ltd
Priority to JP19639087A priority Critical patent/JPS6441002A/en
Publication of JPS6441002A publication Critical patent/JPS6441002A/en
Pending legal-status Critical Current

Links

Landscapes

  • Safety Devices In Control Systems (AREA)

Abstract

PURPOSE:To stop the working of a system including a programmable controller PC in a proper state by selecting the reference data for an abnormal state and outputs this data to a control subject at the time of abnormality. CONSTITUTION:At the time of abnormality of a PC, a data selector 13 selects the reference data of a data setting device 5 by the function of a flip-flop FF7. Then the level of the reference data is changed by a level converter 11 and this data is outputted to a control subject. This reference data functions to prevent the abnormal actions at the time of abnormality. Thus the control subject receives the reference data and works according to this data to be set under a static state, for example. Thus it is possible to set forcibly the output of the PC in an optical state when the abnormality occurs in a system including the PC. As a result, an effective countermeasure is secured against the abnormality.
JP19639087A 1987-08-07 1987-08-07 Countermeasure device for abnormality of programmable controller Pending JPS6441002A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP19639087A JPS6441002A (en) 1987-08-07 1987-08-07 Countermeasure device for abnormality of programmable controller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP19639087A JPS6441002A (en) 1987-08-07 1987-08-07 Countermeasure device for abnormality of programmable controller

Publications (1)

Publication Number Publication Date
JPS6441002A true JPS6441002A (en) 1989-02-13

Family

ID=16357073

Family Applications (1)

Application Number Title Priority Date Filing Date
JP19639087A Pending JPS6441002A (en) 1987-08-07 1987-08-07 Countermeasure device for abnormality of programmable controller

Country Status (1)

Country Link
JP (1) JPS6441002A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03201001A (en) * 1989-12-27 1991-09-02 Komatsu Ltd Malfunction preventing device at clock stop for controller
US7919736B2 (en) 2004-11-02 2011-04-05 Panasonic Corporation Heating device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH03201001A (en) * 1989-12-27 1991-09-02 Komatsu Ltd Malfunction preventing device at clock stop for controller
US7919736B2 (en) 2004-11-02 2011-04-05 Panasonic Corporation Heating device

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