JPS55102005A - Sequence controller - Google Patents
Sequence controllerInfo
- Publication number
- JPS55102005A JPS55102005A JP833679A JP833679A JPS55102005A JP S55102005 A JPS55102005 A JP S55102005A JP 833679 A JP833679 A JP 833679A JP 833679 A JP833679 A JP 833679A JP S55102005 A JPS55102005 A JP S55102005A
- Authority
- JP
- Japan
- Prior art keywords
- output
- failure
- processing section
- operation processing
- input
- 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 stop the operation of sequence controller if a failure is taken place, by enabling to detect the occurrence of failure of output element controlling memory element in the output circuit. CONSTITUTION:The operation processing section reading out the sequence program sequentially from the memory and delivering the input and output address data to the input and output circuit 13, selects the input and output element and executes the test instruction and output instruction. The output circuit 13 is provided with a plurality of FF11-FF1n storing the ON-OFF state of the output element, selector 21 selecting one of them, and data selector 22 delivering ON-OFF signal at test of the output element to the operation processing section. The failure detection circuit detects that the ON-OFF signal of the operation processing section is write-in disable if FF1-FF1n in the circuit 13 are in failure and outputs the failure signal. In this case, the operation of the operation processing section is stopped. Thus, the continuity of control of control variable is avoided in advance in failed FF to avoid malfunction of the control variable.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP833679A JPS55102005A (en) | 1979-01-26 | 1979-01-26 | Sequence controller |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP833679A JPS55102005A (en) | 1979-01-26 | 1979-01-26 | Sequence controller |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55102005A true JPS55102005A (en) | 1980-08-04 |
Family
ID=11690343
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP833679A Pending JPS55102005A (en) | 1979-01-26 | 1979-01-26 | Sequence controller |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55102005A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1985002694A1 (en) * | 1983-12-06 | 1985-06-20 | Fanuc Ltd. | Programmable controller |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4947781A (en) * | 1972-09-13 | 1974-05-09 | ||
JPS5028746A (en) * | 1973-07-13 | 1975-03-24 |
-
1979
- 1979-01-26 JP JP833679A patent/JPS55102005A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4947781A (en) * | 1972-09-13 | 1974-05-09 | ||
JPS5028746A (en) * | 1973-07-13 | 1975-03-24 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1985002694A1 (en) * | 1983-12-06 | 1985-06-20 | Fanuc Ltd. | Programmable controller |
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