JPS5741704A - Sequence controller - Google Patents

Sequence controller

Info

Publication number
JPS5741704A
JPS5741704A JP55116464A JP11646480A JPS5741704A JP S5741704 A JPS5741704 A JP S5741704A JP 55116464 A JP55116464 A JP 55116464A JP 11646480 A JP11646480 A JP 11646480A JP S5741704 A JPS5741704 A JP S5741704A
Authority
JP
Japan
Prior art keywords
output
group
holding
utility
control 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.)
Pending
Application number
JP55116464A
Other languages
Japanese (ja)
Inventor
Kunihiro Oe
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 JP55116464A priority Critical patent/JPS5741704A/en
Publication of JPS5741704A publication Critical patent/JPS5741704A/en
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B9/00—Safety arrangements
    • G05B9/02—Safety arrangements electric
    • G05B9/03—Safety arrangements electric with multiple-channel loop, i.e. redundant control systems
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B23/00—Testing or monitoring of control systems or parts thereof
    • G05B23/02—Electric testing or monitoring
    • G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
    • G05B23/0218—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterised by the fault detection method dealing with either existing or incipient faults
    • G05B23/0224—Process history based detection method, e.g. whereby history implies the availability of large amounts of data
    • G05B23/0227—Qualitative history assessment, whereby the type of data acted upon, e.g. waveforms, images or patterns, is not relevant, e.g. rule based assessment; if-then decisions
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B23/00—Testing or monitoring of control systems or parts thereof
    • G05B23/02—Electric testing or monitoring
    • G05B23/0205—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults
    • G05B23/0259—Electric testing or monitoring by means of a monitoring system capable of detecting and responding to faults characterized by the response to fault detection
    • G05B23/0267—Fault communication, e.g. human machine interface [HMI]
    • G05B23/027—Alarm generation, e.g. communication protocol; Forms of alarm

Abstract

PURPOSE:To avoid an error output approximate to a perfect double system, by carrying out an inspection for the utility group circuits by means of a holding group circuit which is usually in the stop mode in case when the holding double system is worked. CONSTITUTION:The utility and holding group output control circuits 7A and 7B possess a 3-state buffer that separates the input from the output plus a comparator that detects the dissidence between the bits corresponding at an input terminal and an output terminal respectively. An output control circuit (7B) of the holding group cuts off the signal route by usually setting the output of the 3-state buffer at a high impedance. Both switches 8 and 9 are usually closed, and thus the comparator of the output control circuit (7B) compares the output of the holding group (1B) with the output of an output control circuit (7A) of the utility group (1A). According to the result of comparison, an alarm signal is produced or the output of the utility group is prevented.
JP55116464A 1980-08-26 1980-08-26 Sequence controller Pending JPS5741704A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP55116464A JPS5741704A (en) 1980-08-26 1980-08-26 Sequence controller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP55116464A JPS5741704A (en) 1980-08-26 1980-08-26 Sequence controller

Publications (1)

Publication Number Publication Date
JPS5741704A true JPS5741704A (en) 1982-03-09

Family

ID=14687750

Family Applications (1)

Application Number Title Priority Date Filing Date
JP55116464A Pending JPS5741704A (en) 1980-08-26 1980-08-26 Sequence controller

Country Status (1)

Country Link
JP (1) JPS5741704A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5947605A (en) * 1982-09-10 1984-03-17 Mitsubishi Electric Corp Back-up controller
JPS6188310A (en) * 1984-10-04 1986-05-06 Mitsubishi Electric Corp Operation congestion supervisory system in sequence control
JPH07321714A (en) * 1994-05-25 1995-12-08 Nec Corp Bipolar signal changeover circuit

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5028309A (en) * 1973-07-11 1975-03-22
JPS5587201A (en) * 1978-12-25 1980-07-01 Toshiba Corp Double system controller
JPS55108057A (en) * 1979-02-13 1980-08-19 Toshiba Corp Duplex control unit

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5028309A (en) * 1973-07-11 1975-03-22
JPS5587201A (en) * 1978-12-25 1980-07-01 Toshiba Corp Double system controller
JPS55108057A (en) * 1979-02-13 1980-08-19 Toshiba Corp Duplex control unit

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5947605A (en) * 1982-09-10 1984-03-17 Mitsubishi Electric Corp Back-up controller
JPS6188310A (en) * 1984-10-04 1986-05-06 Mitsubishi Electric Corp Operation congestion supervisory system in sequence control
JPH07321714A (en) * 1994-05-25 1995-12-08 Nec Corp Bipolar signal changeover circuit

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