Fault detection apparatus for a programmable controller

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

1979-04-16

1981-02-17

Atkinson, Charles E.

Excavating

361 92, 364900, 371 16, 371 66, G06F 1100

Patent

active

042518830

ABSTRACT:
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 signal to a fault indicating device on the I/O interface rack to signal an under-energized memory battery in the controller processor.

REFERENCES:
patent: 3997879 (1976-12-01), Markley et al.
patent: 4063311 (1977-12-01), Jeremiah et al.
patent: 4118792 (1978-10-01), Struger et al.
patent: 4172289 (1979-10-01), Struger et al.
patent: 4178634 (1979-10-01), Bartlett

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