JPS57159303A - Triplex system transmission circuit - Google Patents
Triplex system transmission circuitInfo
- Publication number
- JPS57159303A JPS57159303A JP4393681A JP4393681A JPS57159303A JP S57159303 A JPS57159303 A JP S57159303A JP 4393681 A JP4393681 A JP 4393681A JP 4393681 A JP4393681 A JP 4393681A JP S57159303 A JPS57159303 A JP S57159303A
- Authority
- JP
- Japan
- Prior art keywords
- signal
- signals
- output
- circuit
- outputted
- 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.)
- Granted
Links
Landscapes
- Safety Devices In Control Systems (AREA)
- Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
Abstract
PURPOSE: To transmit a normal signal to a system at all times, by securing a transmission circuit output always in normal operation as a final output, even if a triplex system transmission circuit is in failure for one circuit system.
CONSTITUTION: In transmitting a signal of a detector 1 as an output signal 3, a signal having an output of an A signal transmission circuit 10 at an attenuator 11 is taken as the signal A. Similarly, signals B and C are outputted from each transmission line, the signals AWC are summed at adders 12, 22 and 32 through combination, and a=C+A, b=A+B and c=B+C are operated. The signals aWc are inputted to a high value selecting circuit 51 and a low value selecting circuit 52. When a signal BH higher than a normal signal is outputted by the signal B, the signals b and c go to high to output signals bH and cH. On the other hand, a signal BL lower than the normal signal is outputted, then the signals b and c output signals bL and cL. In this case, the output (a) is the normal signal aO. Thus, the signal aO is outputted from the circuit 52 as a signal 3 in case of failure toward the BH and the signal aO is outputted from the circuit 51 in case of failure toward the CH.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4393681A JPS57159303A (en) | 1981-03-27 | 1981-03-27 | Triplex system transmission circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4393681A JPS57159303A (en) | 1981-03-27 | 1981-03-27 | Triplex system transmission circuit |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS57159303A true JPS57159303A (en) | 1982-10-01 |
JPH0219481B2 JPH0219481B2 (en) | 1990-05-02 |
Family
ID=12677573
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4393681A Granted JPS57159303A (en) | 1981-03-27 | 1981-03-27 | Triplex system transmission circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57159303A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011107807A (en) * | 2009-11-13 | 2011-06-02 | Hitachi Ltd | Process control device |
-
1981
- 1981-03-27 JP JP4393681A patent/JPS57159303A/en active Granted
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011107807A (en) * | 2009-11-13 | 2011-06-02 | Hitachi Ltd | Process control device |
Also Published As
Publication number | Publication date |
---|---|
JPH0219481B2 (en) | 1990-05-02 |
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