JPH022402A - Programmable controller - Google Patents

Programmable controller

Info

Publication number
JPH022402A
JPH022402A JP63143572A JP14357288A JPH022402A JP H022402 A JPH022402 A JP H022402A JP 63143572 A JP63143572 A JP 63143572A JP 14357288 A JP14357288 A JP 14357288A JP H022402 A JPH022402 A JP H022402A
Authority
JP
Japan
Prior art keywords
data
bus
short
generation
circuit
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
JP63143572A
Other languages
Japanese (ja)
Other versions
JP2538643B2 (en
Inventor
Hiroshi Kikuchi
Susumu Saito
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.)
Fuji Electric Co Ltd
Original Assignee
Fuji 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 Fuji Electric Co Ltd filed Critical Fuji Electric Co Ltd
Priority to JP63143572A priority Critical patent/JP2538643B2/en
Publication of JPH022402A publication Critical patent/JPH022402A/en
Application granted granted Critical
Publication of JP2538643B2 publication Critical patent/JP2538643B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Abstract

PURPOSE:To prevent the generation of erroneous input and erroneous output by detecting the generation of short circuit between an address bus and a data bus and short between mutual data buses in an I/O bus. CONSTITUTION:A programmable controller is constituted by connecting a processor 1 to I/O modules 2 through the I/O bus 3, the input and output of data are executed through the I/O bus 3. The generation of short circuit between the address bus and the data bus is detected by fixing the address bus to 'L' under the state that data are not inputted/outputted/ to/from the I/O modules 2 and reading the data, and the generation of short-circuit between mutual data buses can be detected by setting up a test pattern in an output module and reading out and collating the pattern. When short-circuit between the data buses is generated, writing data do not coincide with reading data, so that abnormality can be detected. Thus, the controller with high reliability cab be offered.
JP63143572A 1988-06-13 1988-06-13 Programmable controller Expired - Lifetime JP2538643B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP63143572A JP2538643B2 (en) 1988-06-13 1988-06-13 Programmable controller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63143572A JP2538643B2 (en) 1988-06-13 1988-06-13 Programmable controller

Publications (2)

Publication Number Publication Date
JPH022402A true JPH022402A (en) 1990-01-08
JP2538643B2 JP2538643B2 (en) 1996-09-25

Family

ID=15341866

Family Applications (1)

Application Number Title Priority Date Filing Date
JP63143572A Expired - Lifetime JP2538643B2 (en) 1988-06-13 1988-06-13 Programmable controller

Country Status (1)

Country Link
JP (1) JP2538643B2 (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52124830A (en) * 1976-04-12 1977-10-20 Mitsubishi Electric Corp Buss malfunction detection circuit
JPS5437436A (en) * 1977-08-29 1979-03-19 Hitachi Ltd Data bus fault diagnosis device for sequence controller
JPS5635233A (en) * 1979-08-30 1981-04-07 Toshiba Corp Fault detecting system for bus line
JPS57209517A (en) * 1981-06-19 1982-12-22 Hitachi Denshi Ltd Self-diagnosing system for bus line

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52124830A (en) * 1976-04-12 1977-10-20 Mitsubishi Electric Corp Buss malfunction detection circuit
JPS5437436A (en) * 1977-08-29 1979-03-19 Hitachi Ltd Data bus fault diagnosis device for sequence controller
JPS5635233A (en) * 1979-08-30 1981-04-07 Toshiba Corp Fault detecting system for bus line
JPS57209517A (en) * 1981-06-19 1982-12-22 Hitachi Denshi Ltd Self-diagnosing system for bus line

Also Published As

Publication number Publication date
JP2538643B2 (en) 1996-09-25

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