JPS6457302A - Sequence controller - Google Patents
Sequence controllerInfo
- Publication number
- JPS6457302A JPS6457302A JP21311487A JP21311487A JPS6457302A JP S6457302 A JPS6457302 A JP S6457302A JP 21311487 A JP21311487 A JP 21311487A JP 21311487 A JP21311487 A JP 21311487A JP S6457302 A JPS6457302 A JP S6457302A
- Authority
- JP
- Japan
- Prior art keywords
- pcs
- interruption
- output
- plant
- generated
- 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
- Safety Devices In Control Systems (AREA)
- Programmable Controllers (AREA)
Abstract
PURPOSE:To prevent a plant from being influenced by the disturbance of an output signal by forming an interruption link between plural programmable controllers connected in parallel, and after checking mutual operation, executing sequence output processing. CONSTITUTION:An input signal I is divided into two components by a sequence controller having a multiplexed programmable controller 2 and the divided signals are simultaneously inputted to two PCs 2a, 2b. Respective interruption links 5a, 5b interrupt each other between the PCs 2a, 2b to generate an interruption on the opposite side. When an interruption generated from the opposite side is detected, '1' is set up in the internal memory of each of the PCs 2a, 2b and stored as a flag. An AND circuit 3 for output signals O1, O2 from the PCs 2a, 2b to a plant 4 outputs a practical output signal O3 to the plant 4 when both the output signals coincide with each other. Even if one of the PCs is failed, an output signal is generated as if a false output is always generated from the failed PC2.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21311487A JPS6457302A (en) | 1987-08-28 | 1987-08-28 | Sequence controller |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP21311487A JPS6457302A (en) | 1987-08-28 | 1987-08-28 | Sequence controller |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6457302A true JPS6457302A (en) | 1989-03-03 |
Family
ID=16633813
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP21311487A Pending JPS6457302A (en) | 1987-08-28 | 1987-08-28 | Sequence controller |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6457302A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02147315U (en) * | 1989-05-18 | 1990-12-14 | ||
JPH0363802A (en) * | 1989-08-02 | 1991-03-19 | Tokyo Gas Co Ltd | Backup method for control circuit and sequencer mechanism capable of performing mutual backup |
JPH04100109A (en) * | 1990-07-18 | 1992-04-02 | Yaskawa Electric Corp | Dual synchronous control system for programmable controller |
JP2013195026A (en) * | 2012-03-22 | 2013-09-30 | Panasonic Corp | Cooker |
-
1987
- 1987-08-28 JP JP21311487A patent/JPS6457302A/en active Pending
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH02147315U (en) * | 1989-05-18 | 1990-12-14 | ||
JPH0363802A (en) * | 1989-08-02 | 1991-03-19 | Tokyo Gas Co Ltd | Backup method for control circuit and sequencer mechanism capable of performing mutual backup |
JPH04100109A (en) * | 1990-07-18 | 1992-04-02 | Yaskawa Electric Corp | Dual synchronous control system for programmable controller |
JP2013195026A (en) * | 2012-03-22 | 2013-09-30 | Panasonic Corp | Cooker |
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