Fault detection apparatus for a programmable controller

Details Fault detection apparatus for a programmable controller Fault detection apparatus for a programmable controller

G - Physics

06

F

354/222

G06F 11/00 (2006.01) G05B 19/05 (2006.01)

Patent

CA 1128208

FAULT DETECTION APPARATUS FOR A PROGRAMMABLE CONTROLLER Abstract of the Disclosure A battery monitoring circuit in a programmable controller generates a logic signal when it senses a low output voltage from a memory back-up battery. A controller processor is programmed to set a fault status bit and store it in a memory with input/output status data. The fault status bit is output to an I/O interface rack together with input/output status data during an I/O scan routine. The fault status bit generates a logic sig- nal to a fault-indicating device on the I/O interface rack to signal an under-energized memory battery in the controller processor.

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