Programmable controller with back-up capability

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

G - Physics

06

F

354/225.2

G06F 11/20 (2006.01) G05B 19/05 (2006.01)

Patent

CA 1174368

PROGRAMMABLE CONTROLLER WITH BACK-UP CAPABILITY Abstract of the Disclosure 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.

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