JPS54125377A - Fault detector for load circuit in sequence control - Google Patents
Fault detector for load circuit in sequence controlInfo
- Publication number
- JPS54125377A JPS54125377A JP3241078A JP3241078A JPS54125377A JP S54125377 A JPS54125377 A JP S54125377A JP 3241078 A JP3241078 A JP 3241078A JP 3241078 A JP3241078 A JP 3241078A JP S54125377 A JPS54125377 A JP S54125377A
- Authority
- JP
- Japan
- Prior art keywords
- load circuit
- load
- exclusive
- output
- light
- 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
Links
Landscapes
- Testing And Monitoring For Control Systems (AREA)
Abstract
PURPOSE:To detect indicating a presence of disconnection, detachment of wiring, etc. in the load circuit, by operating a logical judgement for the output, from a current detector circuit for detecting a flow of current in the load circuit, and the output command. CONSTITUTION:With an output command of the sequencer applied to a terminal 1, a photothyristor 6 comes to be turned on. In case of the load circuit being in a normal state, AC current is fed to a load 10 from AC line 11 with the load 10 working. Simultaneously with the above, though a voltage across both ends of a Zener diode 8, 8' is applied to an exclusive ''or'' 19 through a photocoupler 16, a light emitting diode 21 does not emit a light because of both inputs to the exclusive ''or'' 19 being agreed. In case of a fault like disconnections in the load circuit, even for the output command to be applied to the terminal 1, no generation of voltage across the both ends of the Zener diode 8, 8' causes the exclusive ''or'' 19 to produce an output with the light emitting diode 21 made emitting a light.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3241078A JPS54125377A (en) | 1978-03-23 | 1978-03-23 | Fault detector for load circuit in sequence control |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3241078A JPS54125377A (en) | 1978-03-23 | 1978-03-23 | Fault detector for load circuit in sequence control |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54125377A true JPS54125377A (en) | 1979-09-28 |
Family
ID=12358171
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3241078A Pending JPS54125377A (en) | 1978-03-23 | 1978-03-23 | Fault detector for load circuit in sequence control |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54125377A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56137204U (en) * | 1980-02-29 | 1981-10-17 | ||
JPH01169610A (en) * | 1987-12-25 | 1989-07-04 | Sogo Keibi Hoshiyou Kk | Method for confirming operation of control device |
JPH01199213A (en) * | 1988-02-03 | 1989-08-10 | Daifuku Co Ltd | Method for diagnosing trouble of output system of sequencer |
-
1978
- 1978-03-23 JP JP3241078A patent/JPS54125377A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS56137204U (en) * | 1980-02-29 | 1981-10-17 | ||
JPH01169610A (en) * | 1987-12-25 | 1989-07-04 | Sogo Keibi Hoshiyou Kk | Method for confirming operation of control device |
JPH01199213A (en) * | 1988-02-03 | 1989-08-10 | Daifuku Co Ltd | Method for diagnosing trouble of output system of sequencer |
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