JPS5464949A - Bus-system digital input device - Google Patents

Bus-system digital input device

Info

Publication number
JPS5464949A
JPS5464949A JP13081877A JP13081877A JPS5464949A JP S5464949 A JPS5464949 A JP S5464949A JP 13081877 A JP13081877 A JP 13081877A JP 13081877 A JP13081877 A JP 13081877A JP S5464949 A JPS5464949 A JP S5464949A
Authority
JP
Japan
Prior art keywords
line
output
digital input
resistance
address
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.)
Granted
Application number
JP13081877A
Other languages
Japanese (ja)
Other versions
JPS5913043B2 (en
Inventor
Shigeo Hashimoto
Toshiyuki Ide
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 JP13081877A priority Critical patent/JPS5913043B2/en
Publication of JPS5464949A publication Critical patent/JPS5464949A/en
Publication of JPS5913043B2 publication Critical patent/JPS5913043B2/en
Expired legal-status Critical Current

Links

Landscapes

  • Control By Computers (AREA)
  • Programmable Controllers (AREA)

Abstract

PURPOSE: To give a proper timing to the digital input device for execution of the input by applying the voltage to the address line at all times to detect the voltage change of the address line when the state of the output device changes and then producing the interruption signal to CPU by the detected output.
CONSTITUTION: Resistance 11, switch 9 and detouring preventing diode 10 are provided to each measurement information output device 2 in the BUS-system digital input device which contains plural units of device 2 to deliver the measurement information, exclusive address line 3 to draw the digital output from each device 2 into CPU and data line 4 respectively. Then the voltage is always applied from digital input device 1 via address line 3 with line 3 with line 4 earthed. The state change of device 2 is detected by change detector 12 which detects the change of the general resistance of resistance 8 provided to device 1 and resistance 11 of device 2. Then the interruption is given to CPU via OR operator 13, and at the same time the address of device 2 is memorized in address register 14 via the output of detector 12.
COPYRIGHT: (C)1979,JPO&Japio
JP13081877A 1977-11-02 1977-11-02 BUS digital input device Expired JPS5913043B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP13081877A JPS5913043B2 (en) 1977-11-02 1977-11-02 BUS digital input device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP13081877A JPS5913043B2 (en) 1977-11-02 1977-11-02 BUS digital input device

Publications (2)

Publication Number Publication Date
JPS5464949A true JPS5464949A (en) 1979-05-25
JPS5913043B2 JPS5913043B2 (en) 1984-03-27

Family

ID=15043420

Family Applications (1)

Application Number Title Priority Date Filing Date
JP13081877A Expired JPS5913043B2 (en) 1977-11-02 1977-11-02 BUS digital input device

Country Status (1)

Country Link
JP (1) JPS5913043B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6022210A (en) * 1983-07-18 1985-02-04 Toshiba Corp Digital controller for hydropower plant
JPH06304585A (en) * 1993-04-27 1994-11-01 Kensaku Abe Purification treating device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6022210A (en) * 1983-07-18 1985-02-04 Toshiba Corp Digital controller for hydropower plant
JPH06304585A (en) * 1993-04-27 1994-11-01 Kensaku Abe Purification treating device

Also Published As

Publication number Publication date
JPS5913043B2 (en) 1984-03-27

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