JPS6425206A - System for processing input/output of programmable controller - Google Patents
System for processing input/output of programmable controllerInfo
- Publication number
- JPS6425206A JPS6425206A JP17995987A JP17995987A JPS6425206A JP S6425206 A JPS6425206 A JP S6425206A JP 17995987 A JP17995987 A JP 17995987A JP 17995987 A JP17995987 A JP 17995987A JP S6425206 A JPS6425206 A JP S6425206A
- Authority
- JP
- Japan
- Prior art keywords
- information
- area
- address
- programmable controller
- stored
- 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
- Programmable Controllers (AREA)
Abstract
PURPOSE:To easily detect erroneous input, by storing attribute information representing whether or not an information area is unused in a storage area where input/output information is stored. CONSTITUTION:A programmable controller which performs the operation control of an external equipment is constituted of a processor which executes a sequence program, a memory device 2', etc. In each address of the memory device 2', an area 14 which stores null address information at a leading one bit is provided. And an area 15 which stores information to which the programmable controller is inputted and outputted is arranged following the area 14. In such a way, in the null address information area 14, '1' is stored when the information to be stored in the address is usable, and '0' when it is a null address. As a result, it is possible to detect whether or not a designated address is the null address.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17995987A JPS6425206A (en) | 1987-07-21 | 1987-07-21 | System for processing input/output of programmable controller |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP17995987A JPS6425206A (en) | 1987-07-21 | 1987-07-21 | System for processing input/output of programmable controller |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6425206A true JPS6425206A (en) | 1989-01-27 |
Family
ID=16074958
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP17995987A Pending JPS6425206A (en) | 1987-07-21 | 1987-07-21 | System for processing input/output of programmable controller |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6425206A (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5547504A (en) * | 1978-09-28 | 1980-04-04 | Siemens Ag | Stored program controller |
JPS5591034A (en) * | 1978-12-29 | 1980-07-10 | Fujitsu Ltd | Fault detection system |
JPS60125997A (en) * | 1983-12-13 | 1985-07-05 | Fujitsu Ltd | Write system of writable read only memory element |
-
1987
- 1987-07-21 JP JP17995987A patent/JPS6425206A/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5547504A (en) * | 1978-09-28 | 1980-04-04 | Siemens Ag | Stored program controller |
JPS5591034A (en) * | 1978-12-29 | 1980-07-10 | Fujitsu Ltd | Fault detection system |
JPS60125997A (en) * | 1983-12-13 | 1985-07-05 | Fujitsu Ltd | Write system of writable read only memory element |
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