Programmable controller with self testing i/o structure

Details Programmable controller with self testing i/o structure Programmable controller with self testing i/o structure

G - Physics

05

B

342/21, 354/233,

G05B 19/04 (2006.01) G05B 19/05 (2006.01)

Patent

CA 1265872

Abstract of the Disclosure A programmable controller includes a processor unit which connects to one or more I/O units that connect to sensing devices and operating devices on equipment being controlled. When placed in the RUN mode, the processor determines the number of I/O units required to execute the user control program, and during each subsequent I/O scan, the number of connected and operating I/O units is checked to insure proper operation.

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