JPS5464949A - Bus-system digital input device - Google Patents
Bus-system digital input deviceInfo
- Publication number
- JPS5464949A JPS5464949A JP13081877A JP13081877A JPS5464949A JP S5464949 A JPS5464949 A JP S5464949A JP 13081877 A JP13081877 A JP 13081877A JP 13081877 A JP13081877 A JP 13081877A JP S5464949 A JPS5464949 A JP S5464949A
- Authority
- JP
- Japan
- Prior art keywords
- line
- output
- digital input
- resistance
- address
- 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
- Control By Computers (AREA)
- Programmable Controllers (AREA)
Abstract
PURPOSE: To give a proper timing to the digital input device for execution of the input by applying the voltage to the address line at all times to detect the voltage change of the address line when the state of the output device changes and then producing the interruption signal to CPU by the detected output.
CONSTITUTION: Resistance 11, switch 9 and detouring preventing diode 10 are provided to each measurement information output device 2 in the BUS-system digital input device which contains plural units of device 2 to deliver the measurement information, exclusive address line 3 to draw the digital output from each device 2 into CPU and data line 4 respectively. Then the voltage is always applied from digital input device 1 via address line 3 with line 3 with line 4 earthed. The state change of device 2 is detected by change detector 12 which detects the change of the general resistance of resistance 8 provided to device 1 and resistance 11 of device 2. Then the interruption is given to CPU via OR operator 13, and at the same time the address of device 2 is memorized in address register 14 via the output of detector 12.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13081877A JPS5913043B2 (en) | 1977-11-02 | 1977-11-02 | BUS digital input device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP13081877A JPS5913043B2 (en) | 1977-11-02 | 1977-11-02 | BUS digital input device |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS5464949A true JPS5464949A (en) | 1979-05-25 |
JPS5913043B2 JPS5913043B2 (en) | 1984-03-27 |
Family
ID=15043420
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP13081877A Expired JPS5913043B2 (en) | 1977-11-02 | 1977-11-02 | BUS digital input device |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5913043B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6022210A (en) * | 1983-07-18 | 1985-02-04 | Toshiba Corp | Digital controller for hydropower plant |
JPH06304585A (en) * | 1993-04-27 | 1994-11-01 | Kensaku Abe | Purification treating device |
-
1977
- 1977-11-02 JP JP13081877A patent/JPS5913043B2/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6022210A (en) * | 1983-07-18 | 1985-02-04 | Toshiba Corp | Digital controller for hydropower plant |
JPH06304585A (en) * | 1993-04-27 | 1994-11-01 | Kensaku Abe | Purification treating device |
Also Published As
Publication number | Publication date |
---|---|
JPS5913043B2 (en) | 1984-03-27 |
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