JPS55134402A - Process control unit - Google Patents
Process control unitInfo
- Publication number
- JPS55134402A JPS55134402A JP4089479A JP4089479A JPS55134402A JP S55134402 A JPS55134402 A JP S55134402A JP 4089479 A JP4089479 A JP 4089479A JP 4089479 A JP4089479 A JP 4089479A JP S55134402 A JPS55134402 A JP S55134402A
- Authority
- JP
- Japan
- Prior art keywords
- processing units
- control unit
- circuits
- process control
- themselves
- 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 make a process control unit high-reliability by making central processing units duplex.
CONSTITUTION: Processing units 1 and 2 exchange process operation information through communication control unit 3. Processing units 1 and 2 exchange signals with devices 11W14 through repeating points 5W10 and output line 15. 19 And 20 in the figure indicate manual/automatic switching circuits, and the possessory right of I/O circuits is determined by selection circuits 17 and 18 in case of manual operations. The anomaly signal of processing units 1 and 2 themselves is inputted as an interrupt input to processing units of each other through OR circuit 16 between selection circuits 17 and 18 mutually. Processing units 1 and 2 take in this interrupt input and the selection signal to decide whether they obtain the I/O operation execution right to start the process control operation or transfer the I/O operation execution right, which has been occupied by themselves, to the processing units of each other and wait.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4089479A JPS55134402A (en) | 1979-04-06 | 1979-04-06 | Process control unit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4089479A JPS55134402A (en) | 1979-04-06 | 1979-04-06 | Process control unit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS55134402A true JPS55134402A (en) | 1980-10-20 |
Family
ID=12593208
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4089479A Pending JPS55134402A (en) | 1979-04-06 | 1979-04-06 | Process control unit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS55134402A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58191002A (en) * | 1982-04-30 | 1983-11-08 | Mitsubishi Electric Corp | Arithmetic processor of plant controller |
JPH0193219A (en) * | 1987-10-05 | 1989-04-12 | Hitachi Ltd | System switching system |
-
1979
- 1979-04-06 JP JP4089479A patent/JPS55134402A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58191002A (en) * | 1982-04-30 | 1983-11-08 | Mitsubishi Electric Corp | Arithmetic processor of plant controller |
JPH0193219A (en) * | 1987-10-05 | 1989-04-12 | Hitachi Ltd | System switching system |
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