JPS617720A - Switching signal detecting circuit - Google Patents

Switching signal detecting circuit

Info

Publication number
JPS617720A
JPS617720A JP12878084A JP12878084A JPS617720A JP S617720 A JPS617720 A JP S617720A JP 12878084 A JP12878084 A JP 12878084A JP 12878084 A JP12878084 A JP 12878084A JP S617720 A JPS617720 A JP S617720A
Authority
JP
Japan
Prior art keywords
output
sampling
circuit
signals
signal
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
JP12878084A
Other languages
Japanese (ja)
Inventor
Masao Kasuga
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.)
Victor Company of Japan Ltd
Nippon Victor KK
Original Assignee
Victor Company of Japan Ltd
Nippon Victor KK
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 Victor Company of Japan Ltd, Nippon Victor KK filed Critical Victor Company of Japan Ltd
Priority to JP12878084A priority Critical patent/JPS617720A/en
Publication of JPS617720A publication Critical patent/JPS617720A/en
Pending legal-status Critical Current

Links

Classifications

    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05BCONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B19/00Programme-control systems
    • G05B19/02Programme-control systems electric
    • G05B19/04Programme control other than numerical control, i.e. in sequence controllers or logic controllers
    • G05B19/05Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts
    • G05B19/054Input/output
    • HELECTRICITY
    • H03BASIC ELECTRONIC CIRCUITRY
    • H03KPULSE TECHNIQUE
    • H03K17/00Electronic switching or gating, i.e. not by contact-making and –breaking

Abstract

PURPOSE:To update data at the time only when a switching signal changes so as to prevent wrong detection, by eliminating the influence of chattering and quickly and surely detecting the switch signal. CONSTITUTION:Sampling is performed at a low frequency of 30-100Hz, by inputting switching signals of levels corresponding to the turning on and turning off switches S1-Sn in input terminals 51-5n of a switch signal detecting circuit and supplying the switching signals to the 1st sampling means 6. The output of the means 6 is supplied to a logical circuit 7 and level change in the output signal is detected. The output signals of the logical circuit 7 is supplied to another sampling means 8 and sampling is performed at a high frequency higher than the low frequency of 30-100Hz about two figures. The output signal of the means 8 is added to a data fetching circuit 9 and the sampling output of the means 6 is fetched by the circuit 9. Then the influence of the chattering of the switches S1-Sn is eliminated and switch detecting signals are outputted to output terminals 101-10n.
JP12878084A 1984-06-22 1984-06-22 Switching signal detecting circuit Pending JPS617720A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP12878084A JPS617720A (en) 1984-06-22 1984-06-22 Switching signal detecting circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP12878084A JPS617720A (en) 1984-06-22 1984-06-22 Switching signal detecting circuit

Publications (1)

Publication Number Publication Date
JPS617720A true JPS617720A (en) 1986-01-14

Family

ID=14993274

Family Applications (1)

Application Number Title Priority Date Filing Date
JP12878084A Pending JPS617720A (en) 1984-06-22 1984-06-22 Switching signal detecting circuit

Country Status (1)

Country Link
JP (1) JPS617720A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0302940A1 (en) * 1987-01-30 1989-02-15 Fanuc Ltd. Signal input device
CN102637002A (en) * 2012-04-18 2012-08-15 成都阜特科技有限公司 Switching value signal collecting method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0302940A1 (en) * 1987-01-30 1989-02-15 Fanuc Ltd. Signal input device
CN102637002A (en) * 2012-04-18 2012-08-15 成都阜特科技有限公司 Switching value signal collecting method

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