US 8,072,889 B2Granted

Programmable controller

AssigneeJtekt Corporation

InventorsSatoshi Kato, Tsutomu Araki

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Abstract

While a microcomputer is executing a self-diagnosis (A), second diagnosis pulse output means of a B-system microcomputer is not used utterly. Further, during this time, the B-system microcomputer 100B does not execute a processing relating to at least the self-diagnosis (A) utterly. By shifting the timings for the A-system and the B-system to output the diagnosis pulses, independencies can be secured between respective diagnosis processing (self-diagnoses (A) and (B)). Thus, the independencies between the A-system and the B-system can be verified briefly by the self-diagnosis (A) on the A-system side. Further, first diagnosis pulse group are outputted parallel and simultaneously from first diagnosis pulse output means. Thus, since cyclic control is not required for respective external input devices, it can be done to verify the independencies between the A-system and the B-system within a short period of time.

Claims7

Dependent claims

A programmable controller wherein a plurality of external input devices and a processing device for processing an input signal group inputted from the external input devices are multiplexed by a plurality of systems and wherein upon coincidence between the input signal groups in all the systems, correct input signals are judged to have been inputted while upon non-coincidence therebetween, an abnormality stop processing is performed,

wherein the processing device in one system comprises:
diagnosis pulse output means for parallel outputting a diagnosis pulse group to the processing device in another system at a timing unique to the one system;
check means for inputting thereinto diagnosis pulses outputted from the diagnosis pulse output means in the another system and for interrupting transmission of the input signal group for a period of the diagnosis pulses only;
and
abnormality judgment means for executing an abnormality stop processing when a signal of the input signal group changes in response to the outputting of the diagnosis pulses from the diagnosis pulse output means in its own system,
wherein the signal processing device in the one system includes:
serial diagnosis pulse output means for serially outputting serial diagnosis pulses for each input terminal to a processing device in another system;
and pulse check means for inputting serial diagnosis pulses that are serially outputted for each input terminal from serial pulse output means of the processing device in the another system and for making the judgment of abnormality to execute the abnormality stop processing when an input signal does not change in correspondence to the period of the serial diagnosis pulses.

5 more elements

A programmable controller constructed to be duplexed by a first input terminal group for inputting a first input signal group which is outputted from an external input device group each constructed to be duplexed;

a first signal processing device for processing the first input signal group inputted to the first input terminal group;
a second input terminal group for inputting a second input signal group outputted from the external input device group;
and a second signal processing device for processing the second input signal group inputted to the second input terminal group, wherein a correct signal is judged to have been inputted when a first input signal being one element of the first input signal group coincides with a second input signal paired with first input signal while an abnormal processing is performed in the case of non-coincidence,
wherein the first signal processing device comprises:
first diagnosis pulse output means for parallel outputting a first diagnosis pulse group to the second signal processing device;
first check means for parallel inputting thereinto a second diagnosis pulse group outputted from the second signal processing device and for interrupting transmission of the first input signal group for a period of the second diagnosis pulse group only;
and
first abnormality judgment means for making a judgment of abnormality to execute an abnormality stop processing when the first input signal group changes in response to the outputting of the first diagnosis pulse group from the first diagnosis pulse output means, and
wherein the second signal processing device comprises:
second diagnosis pulse output means for parallel outputting the second diagnosis pulse group to the first check means at a timing which is different from the outputting of the first diagnosis pulse group;
second check means for parallel inputting thereinto the first diagnosis pulse group outputted from the first diagnosis pulse output means and for interrupting transmission of the second input signal group for a period of the first diagnosis pulse group only;
and
second abnormality judgment means for making the judgment of abnormality to execute the abnormality stop processing when the second input signal group changes in response to the outputting of the second diagnosis pulse group from the second diagnosis pulse output means.

10 more elements

Dependencies are inferred from the claim text.

Facts

Application: 11/658,612Filed 22 Jul 2005
Priority: JP 2004-22281630 Jul 2004
Published: US 2008/0082212 A13 Apr 2008
Granted: 6 Dec 2011
Term ends: Not estimatedThe source records don’t support an estimate.

Classification15 codes

G05B 9/03
Electric: with multiple-channel loop, i.e. redundant control systems
G05B 19/058
Programmable logic controllers, e.g. simulating logic interconnections of signals according to ladder diagrams or function charts: safety, monitoring
G05B 2219/1184
Plc I-O input output: test ability of input for on, off capability
G05B 2219/1186
Plc I-O input output: redundant inputs parallel, outputs series, load safe switch off, AND condition