JPS5452496A - Detection circuit for lamp break of lamp display circuit - Google Patents

Detection circuit for lamp break of lamp display circuit

Info

Publication number
JPS5452496A
JPS5452496A JP11922477A JP11922477A JPS5452496A JP S5452496 A JPS5452496 A JP S5452496A JP 11922477 A JP11922477 A JP 11922477A JP 11922477 A JP11922477 A JP 11922477A JP S5452496 A JPS5452496 A JP S5452496A
Authority
JP
Japan
Prior art keywords
lamp
circuit
input
display lamp
break
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
JP11922477A
Other languages
Japanese (ja)
Inventor
Yasushi Mori
Norio Miyawaki
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.)
Omron Corp
Original Assignee
Omron Tateisi Electronics Co
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 Omron Tateisi Electronics Co filed Critical Omron Tateisi Electronics Co
Priority to JP11922477A priority Critical patent/JPS5452496A/en
Publication of JPS5452496A publication Critical patent/JPS5452496A/en
Pending legal-status Critical Current

Links

Landscapes

  • Circuit Arrangement For Electric Light Sources In General (AREA)

Abstract

PURPOSE: To detect the break of a lamp rapidly judging from the arithmetic results of an input signal and fixed-level logical signal obtained by converting the potential variation at the connection point between a switching element and the lamp, by connecting the display lamp and switching element in series to a power supply.
CONSTITUTION: In the circuit which displays information on the display lamp by connecting the switching element controlled by a logical signal input and display lamp in series to the power supply, annunciator circuit 1 is connected between input alarm input contact 3 and display lamp 4. This circuit 2 is provided with transistor Tr2 whose emitter is connected to logic circuit 2 via resistance R3, and the potential variation at connection point (b) between display lamp 4 and output Tr1; and the potential at connection point (b) is applied to the base of Tr2 via input resistances R4 and R5, and collector output (c) of Tr2 and lamp display signal (a) of circuit 2 are both applied to gate circuit 7, so that the break of lamp 4 will be detected by the output of circuit 7
COPYRIGHT: (C)1979,JPO&Japio
JP11922477A 1977-10-03 1977-10-03 Detection circuit for lamp break of lamp display circuit Pending JPS5452496A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11922477A JPS5452496A (en) 1977-10-03 1977-10-03 Detection circuit for lamp break of lamp display circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11922477A JPS5452496A (en) 1977-10-03 1977-10-03 Detection circuit for lamp break of lamp display circuit

Publications (1)

Publication Number Publication Date
JPS5452496A true JPS5452496A (en) 1979-04-25

Family

ID=14756020

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11922477A Pending JPS5452496A (en) 1977-10-03 1977-10-03 Detection circuit for lamp break of lamp display circuit

Country Status (1)

Country Link
JP (1) JPS5452496A (en)

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