JPS54129925A - Process input-output device - Google Patents
Process input-output deviceInfo
- Publication number
- JPS54129925A JPS54129925A JP3775378A JP3775378A JPS54129925A JP S54129925 A JPS54129925 A JP S54129925A JP 3775378 A JP3775378 A JP 3775378A JP 3775378 A JP3775378 A JP 3775378A JP S54129925 A JPS54129925 A JP S54129925A
- Authority
- JP
- Japan
- Prior art keywords
- output
- cpu
- scanner
- board
- input
- 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 prevent error detection attending upon the insertion and extraction of a scanner board, by detecting the connection and disconnection of a signal line corresponding to the insertion and extraction of the scanner board into and from a input-output device.
CONSTITUTION: When scanner board #3 among board group 1 equipped to a back panel is pulled out, loop circuit 2 becomes broken, LEDD1 of photocoupler 3 turns OFF, and photo transistor Q1 also turns OFF. Therefore, the output of Schmitt circuit 4 is zero and signal line 8 is "1",thereby informing a CPU that a line is in process of extraction. Then, the process input-output device will not operate attending upon it. Further, monostable multivibrator 6 is triggered to generate the output for time T1 and to send it to the CPU via line 9. Consequently, the CPU inhibits an input to scanner boards for time T1. Once scanner board #3 is inserted next, loop circuit 2 turns into a closed circuit, signal line 8 is zero, and monostable multivibrator 7 is triggerd, so that the output terminal will be "1". This output is transmitted to the CPU, so that input data will be inhibited from being inputted to scanner board #3 for time T2.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3775378A JPS54129925A (en) | 1978-03-31 | 1978-03-31 | Process input-output device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP3775378A JPS54129925A (en) | 1978-03-31 | 1978-03-31 | Process input-output device |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS54129925A true JPS54129925A (en) | 1979-10-08 |
Family
ID=12506224
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP3775378A Pending JPS54129925A (en) | 1978-03-31 | 1978-03-31 | Process input-output device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS54129925A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59127283A (en) * | 1982-12-29 | 1984-07-23 | Fujitsu Ltd | Data writing system |
JPS6047062U (en) * | 1983-09-05 | 1985-04-02 | オムロン株式会社 | Data transmission method between programmable controller and program console |
-
1978
- 1978-03-31 JP JP3775378A patent/JPS54129925A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59127283A (en) * | 1982-12-29 | 1984-07-23 | Fujitsu Ltd | Data writing system |
JPS6047062U (en) * | 1983-09-05 | 1985-04-02 | オムロン株式会社 | Data transmission method between programmable controller and program console |
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