JPS648404A - Relay check system for pmc - Google Patents
Relay check system for pmcInfo
- Publication number
- JPS648404A JPS648404A JP62163813A JP16381387A JPS648404A JP S648404 A JPS648404 A JP S648404A JP 62163813 A JP62163813 A JP 62163813A JP 16381387 A JP16381387 A JP 16381387A JP S648404 A JPS648404 A JP S648404A
- Authority
- JP
- Japan
- Prior art keywords
- change
- contact
- memory
- stored
- pmc
- 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
Abstract
PURPOSE:To easily and surely detect a contact causing a change by executing exclusive OR processing of the stored contents of logical states between a relay coil and contact respectively obtained before and after the change and specifying and displaying the contact. CONSTITUTION:A logical state obtained before a change is stored in an N-bit memory 1 storing the state of a coil in the N-th bit and storing the states of contacts in the 1st (N-1)th bits and the logical state obtained after the change is stored in a memory 2 similarly to the memory 1. When the exclusive OR processing of the contents of respective bits in the memories 1, 2 is executed and the processed result is stored in a memory 3 having the same constitution as the memories 1, 2, a contact corresponding to a obit set up to '1' can be easily and surely detected and displayed as a contact causing the change.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62163813A JPS648404A (en) | 1987-06-30 | 1987-06-30 | Relay check system for pmc |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62163813A JPS648404A (en) | 1987-06-30 | 1987-06-30 | Relay check system for pmc |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS648404A true JPS648404A (en) | 1989-01-12 |
Family
ID=15781203
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62163813A Pending JPS648404A (en) | 1987-06-30 | 1987-06-30 | Relay check system for pmc |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS648404A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5203188A (en) * | 1991-09-16 | 1993-04-20 | Morgan Construction Company | System and method for monitoring a rolling mill |
KR100459208B1 (en) * | 1998-02-26 | 2005-01-31 | 엘지산전 주식회사 | Relay operation feedback circuit of digital output board having improved reliability |
-
1987
- 1987-06-30 JP JP62163813A patent/JPS648404A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5203188A (en) * | 1991-09-16 | 1993-04-20 | Morgan Construction Company | System and method for monitoring a rolling mill |
KR100459208B1 (en) * | 1998-02-26 | 2005-01-31 | 엘지산전 주식회사 | Relay operation feedback circuit of digital output board having improved reliability |
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