JPS55112625A - Digital input circuit - Google Patents

Digital input circuit

Info

Publication number
JPS55112625A
JPS55112625A JP1974179A JP1974179A JPS55112625A JP S55112625 A JPS55112625 A JP S55112625A JP 1974179 A JP1974179 A JP 1974179A JP 1974179 A JP1974179 A JP 1974179A JP S55112625 A JPS55112625 A JP S55112625A
Authority
JP
Japan
Prior art keywords
phc25
contact
input
signal
phc23
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
JP1974179A
Other languages
Japanese (ja)
Inventor
Yutaka Moriyama
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.)
Toshiba Corp
Original Assignee
Toshiba Corp
Tokyo Shibaura Electric Co 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 Toshiba Corp, Tokyo Shibaura Electric Co Ltd filed Critical Toshiba Corp
Priority to JP1974179A priority Critical patent/JPS55112625A/en
Publication of JPS55112625A publication Critical patent/JPS55112625A/en
Pending legal-status Critical Current

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  • Input From Keyboards Or The Like (AREA)

Abstract

PURPOSE: To reduce the number of PHCs, by dividing the input signal into a plurality of groups, providing the photo couplers PHC common to each group and the scanning circuit in series connection with the input signal, and selective scanning via PHCs.
CONSTITUTION: The input contact 21 is sequentially scanned with the signal selection PHC23 and the photo diode of input PHC25 is driven via the diode 24. In case of non-selection, since the signal selection pulses CP1...CPm are all O and PHC23 is off, no current flows to PHC25 even with the contact 21 closed. At signal read-in, when the pulses CP1...CPm are sequentially 1, PHC23 is ON. IF the contact 21 is closed, current flows to the diode of PHC25, the output of PHC25 is 1, and the information of the contact 21 is read in the register 22 with the read-in pulse CP0 to the register 22. With this constitution, the number of PHCs can be reduced and the connections between the CPU and input circuits can be reduced.
COPYRIGHT: (C)1980,JPO&Japio
JP1974179A 1979-02-23 1979-02-23 Digital input circuit Pending JPS55112625A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1974179A JPS55112625A (en) 1979-02-23 1979-02-23 Digital input circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1974179A JPS55112625A (en) 1979-02-23 1979-02-23 Digital input circuit

Publications (1)

Publication Number Publication Date
JPS55112625A true JPS55112625A (en) 1980-08-30

Family

ID=12007752

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1974179A Pending JPS55112625A (en) 1979-02-23 1979-02-23 Digital input circuit

Country Status (1)

Country Link
JP (1) JPS55112625A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58155446A (en) * 1982-03-12 1983-09-16 Oki Electric Ind Co Ltd Signal input device
JPS60252936A (en) * 1984-05-29 1985-12-13 Fanuc Ltd Loadable and unloadable system of signal input and picture display device
JPS62195802U (en) * 1986-05-30 1987-12-12

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58155446A (en) * 1982-03-12 1983-09-16 Oki Electric Ind Co Ltd Signal input device
JPH0147825B2 (en) * 1982-03-12 1989-10-17 Oki Electric Ind Co Ltd
JPS60252936A (en) * 1984-05-29 1985-12-13 Fanuc Ltd Loadable and unloadable system of signal input and picture display device
JPS62195802U (en) * 1986-05-30 1987-12-12

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