JPS5745745A - Failure detection system for input circuit - Google Patents
Failure detection system for input circuitInfo
- Publication number
- JPS5745745A JPS5745745A JP12060880A JP12060880A JPS5745745A JP S5745745 A JPS5745745 A JP S5745745A JP 12060880 A JP12060880 A JP 12060880A JP 12060880 A JP12060880 A JP 12060880A JP S5745745 A JPS5745745 A JP S5745745A
- Authority
- JP
- Japan
- Prior art keywords
- pulse
- gate
- circuit
- pcn
- input circuit
- 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
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/24—Testing correct operation
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Dc Digital Transmission (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
PURPOSE:To detect the production of failures in an input circuit automatically, by giving a test pulse periodically produced to an input circuit having a plurality of isolation circuits and monitoring the output of an isolation circuit on a display device. CONSTITUTION:An input signal (d) given between terminals IN1-INn and a common terminal G is inputted to a latch circuit LT via photo couplers PC1-PCn and inverters IV1-IVn to illuminate light emitting diodes LD1-LDn. The circuit LT holds the input signal according to a stroke pulse SP (c) from a pulse generator PG and outputs a pulse (e). A test pulse TP (a) is generated and applied to the PC1- PCn at a different time from the SP (c) from the PG, and the output passes through the IV1-IVn and a gate G11 and an L level signal is inputted to an AND gate G12. The PG generates a sampling pulse (b) at almost the center of the TP (a) and it is applied to the gate G12, and if either of the PC1-PCn is in failure, the gate G12 outputs an H level signal to illuminate a light emitting diode LD21 for the display of failures.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12060880A JPS5745745A (en) | 1980-09-02 | 1980-09-02 | Failure detection system for input circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP12060880A JPS5745745A (en) | 1980-09-02 | 1980-09-02 | Failure detection system for input circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5745745A true JPS5745745A (en) | 1982-03-15 |
Family
ID=14790451
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP12060880A Pending JPS5745745A (en) | 1980-09-02 | 1980-09-02 | Failure detection system for input circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5745745A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7145422B2 (en) | 2003-02-21 | 2006-12-05 | Sumitomo Electric Industries, Ltd. | DC relay |
-
1980
- 1980-09-02 JP JP12060880A patent/JPS5745745A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7145422B2 (en) | 2003-02-21 | 2006-12-05 | Sumitomo Electric Industries, Ltd. | DC relay |
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