Programmable controller with back-up capability

Details Programmable controller with back-up capability Programmable controller with back-up capability

1982-04-12

1985-06-04

Heckler, Thomas M.

Boots, shoes, and leggings

364187, G06F 1546

Patent

active

045218714

ABSTRACT:
An active programmable controller services I/O racks which contain circuits that interface with sensing devices and operating devices on a machine being controlled. A back-up programmable controller monitors this I/O data to maintain a current I/O image table in its memory. Other status data is coupled to the back-up controller from the active controller through a peer-to-peer communications link. If a malfunction occurs in the active controller, the back-up controller is signaled to switch to the active mode in which it assumes control of the operating devices on the machine being controlled.

REFERENCES:
patent: 4053747 (1977-10-01), Davis
patent: 4122519 (1978-10-01), Bielawski et al.
patent: 4276593 (1981-06-01), Hansen
patent: 4351023 (1982-09-01), Richer

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