JPS55159627A - Analog output circuit - Google Patents

Analog output circuit

Info

Publication number
JPS55159627A
JPS55159627A JP6620479A JP6620479A JPS55159627A JP S55159627 A JPS55159627 A JP S55159627A JP 6620479 A JP6620479 A JP 6620479A JP 6620479 A JP6620479 A JP 6620479A JP S55159627 A JPS55159627 A JP S55159627A
Authority
JP
Japan
Prior art keywords
exceeds
failure
switch
output circuit
analog output
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
JP6620479A
Other languages
Japanese (ja)
Inventor
Takashi Sase
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 JP6620479A priority Critical patent/JPS55159627A/en
Publication of JPS55159627A publication Critical patent/JPS55159627A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
    • G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
    • G01R19/16571—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing AC or DC current with one threshold, e.g. load current, over-current, surge current or fault current

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Analogue/Digital Conversion (AREA)

Abstract

PURPOSE:To increase the reliability of operation, by detecting a failure, when the output current exceeds a given value, through the detection of it and the operation of photocoupler. CONSTITUTION:If the current value fed from a D/A converter 4 to a load 100 exceeds the maximum current at normal state and the voltage equal to a voltage drop produced across a resistor 10 exceeds the threshold value of a semiconductor switch 11, the switch 11 is ON. Thus, the output current flowing via the resistor 10 is changed over from the load 100 to the switch 11 and flows to a light emitting element 51. When this element 51 illuminates, a photodetector 52 is in conductive state and a failure in an analog output circuit can be informed to a computer 1 via a failure informing section 6.
JP6620479A 1979-05-30 1979-05-30 Analog output circuit Pending JPS55159627A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6620479A JPS55159627A (en) 1979-05-30 1979-05-30 Analog output circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6620479A JPS55159627A (en) 1979-05-30 1979-05-30 Analog output circuit

Publications (1)

Publication Number Publication Date
JPS55159627A true JPS55159627A (en) 1980-12-11

Family

ID=13309067

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6620479A Pending JPS55159627A (en) 1979-05-30 1979-05-30 Analog output circuit

Country Status (1)

Country Link
JP (1) JPS55159627A (en)

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