Sequence control apparatus

Details Sequence control apparatus Sequence control apparatus

1986-02-10

1988-05-31

Atkinson, Charles E.

Boots, shoes, and leggings

364184, G06F 1100

Patent

active

047485531

ABSTRACT:
The states of the signals inputted to a programmable sequence controller or outputted from the programmable sequence controller are stored by a few scanning operations. A check is made to see if a combination of input and output signals which cannot be generated during one scanning operation in the normal operating mode exists in that memory content or not, thereby investigating causes of the occurrence of abnormalities.

REFERENCES:
patent: 3497685 (1970-02-01), Stafford et al.
patent: 4441074 (1984-04-01), Bockett-Pugh et al.
patent: 4521847 (1985-06-01), Ziehm et al.
patent: 4604746 (1986-08-01), Blum
patent: 4633384 (1986-12-01), Kusumi

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