JPS5719839A - Analog input device - Google Patents
Analog input deviceInfo
- Publication number
- JPS5719839A JPS5719839A JP9272980A JP9272980A JPS5719839A JP S5719839 A JPS5719839 A JP S5719839A JP 9272980 A JP9272980 A JP 9272980A JP 9272980 A JP9272980 A JP 9272980A JP S5719839 A JPS5719839 A JP S5719839A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- capacitor
- analog input
- switch
- analog
- 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
- 239000003990 capacitor Substances 0.000 abstract 4
- 238000001514 detection method Methods 0.000 abstract 2
Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/05—Digital input using the sampling of an analogue quantity at regular intervals of time, input from a/d converter or output to d/a converter
Landscapes
- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Control By Computers (AREA)
Abstract
PURPOSE:To elevate the reliability of a system and also to constitute that which is small-sized and inexpensive, by adding a disconnection detecting function to an analog input device having a noninsulating input circuit, and detecting disconnection. CONSTITUTION:An analog input signal is made to charge a capacitor 32 through an input resistance 31 and a switch 39 from an analog detection device 37, closes switches 33, 34 by a timing controlling circuit 36, and is inputted to a level converting circuit 38. When an analog input circuit is disconnected, charge which has charged the capacitor 32 opens the switch 33 by the timing controlling circuit 36 after a prescribed time has elapsed, and since a circuit in case when the switch 39 has been closed is an opened loop, voltage Vc of the capacitor 32 is not varied. Accordingly, when voltage Vc of the capacitor 32 is measured, whether a state between the analog detection device 37 and the analog input circuit is normal or not can be detected even in the event of disconnection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9272980A JPS5719839A (en) | 1980-07-09 | 1980-07-09 | Analog input device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9272980A JPS5719839A (en) | 1980-07-09 | 1980-07-09 | Analog input device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5719839A true JPS5719839A (en) | 1982-02-02 |
Family
ID=14062507
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9272980A Pending JPS5719839A (en) | 1980-07-09 | 1980-07-09 | Analog input device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5719839A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6378227A (en) * | 1986-09-22 | 1988-04-08 | Chino Corp | Insulating circuit |
| US6107831A (en) * | 1997-07-18 | 2000-08-22 | Nec Corporation | Level conversion circuit |
-
1980
- 1980-07-09 JP JP9272980A patent/JPS5719839A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6378227A (en) * | 1986-09-22 | 1988-04-08 | Chino Corp | Insulating circuit |
| JPH0431409B2 (en) * | 1986-09-22 | 1992-05-26 | ||
| US6107831A (en) * | 1997-07-18 | 2000-08-22 | Nec Corporation | Level conversion circuit |
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