JPS55103416A - Fault detector for plant state detector - Google Patents
Fault detector for plant state detectorInfo
- Publication number
- JPS55103416A JPS55103416A JP1045579A JP1045579A JPS55103416A JP S55103416 A JPS55103416 A JP S55103416A JP 1045579 A JP1045579 A JP 1045579A JP 1045579 A JP1045579 A JP 1045579A JP S55103416 A JPS55103416 A JP S55103416A
- Authority
- JP
- Japan
- Prior art keywords
- detectors
- detector
- fault
- low value
- plant state
- 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 Or Calibration Of Command Recording Devices (AREA)
Abstract
PURPOSE: To secure the steady control for the plant state as well as enable the on- line maintenance by supplying the signal of the duplicated detector to the control system via the low value selection circuit and then detecting the fault of the detection signal based on the low value selection output.
CONSTITUTION: The detection pressure or the like of the plant state quantity due to detectors 1 and 2 is supplied to the control system via change-over switches 3 and 4, low value selectors 5 and 6, etc. and after addition of 1/2 gain through adder 7. On the other hand, the detection output from detectors 1 and 2 receives the subtraction operation through subtractors 8 and 9 with the signal sent from adder 7, and comparators 10 and 11 generate the OFF signals when both detectors 1 and 2 are normal and then generate the ON signals according to fault detectors 1 and 2. Thus the alarm is given to the fault occurrence. In such case, faulty detectors 1 and 2 are cut off through operation of switches 3 and 4 with no outut generated from detectors 1 and 2. But bias voltage VB larger than the detection output is applied to circuits 5 and 6. Thus both the inspection and maintenance can be given to the detector with no fault occurrence and under the on-line state.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1045579A JPS55103416A (en) | 1979-02-02 | 1979-02-02 | Fault detector for plant state detector |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1045579A JPS55103416A (en) | 1979-02-02 | 1979-02-02 | Fault detector for plant state detector |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55103416A true JPS55103416A (en) | 1980-08-07 |
Family
ID=11750609
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1045579A Pending JPS55103416A (en) | 1979-02-02 | 1979-02-02 | Fault detector for plant state detector |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55103416A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58200106A (en) * | 1982-05-18 | 1983-11-21 | Sumitomo Metal Ind Ltd | Automatic control device for length measuring machine |
JPS6382875A (en) * | 1986-09-29 | 1988-04-13 | Hitachi Ltd | Motor driven power steering device |
JPH03122536A (en) * | 1989-09-28 | 1991-05-24 | Endress & Hauser Gmbh & Co | Differential pressure measuring apparatus |
-
1979
- 1979-02-02 JP JP1045579A patent/JPS55103416A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58200106A (en) * | 1982-05-18 | 1983-11-21 | Sumitomo Metal Ind Ltd | Automatic control device for length measuring machine |
JPS6382875A (en) * | 1986-09-29 | 1988-04-13 | Hitachi Ltd | Motor driven power steering device |
JPH03122536A (en) * | 1989-09-28 | 1991-05-24 | Endress & Hauser Gmbh & Co | Differential pressure measuring apparatus |
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