JPS5719839A - Analog input device - Google Patents

Analog input device

Info

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
Application number
JP9272980A
Other languages
Japanese (ja)
Inventor
Shinichi Matsushima
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hitachi Ltd
Original Assignee
Hitachi Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP9272980A priority Critical patent/JPS5719839A/en
Publication of JPS5719839A publication Critical patent/JPS5719839A/en
Pending legal-status Critical Current

Links

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.
JP9272980A 1980-07-09 1980-07-09 Analog input device Pending JPS5719839A (en)

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)

* Cited by examiner, † Cited by third party
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

Cited By (3)

* Cited by examiner, † Cited by third party
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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