Program protection module for programmable controller

Details Program protection module for programmable controller Program protection module for programmable controller

G - Physics

06

F

354/225, 354/227

G06F 13/00 (2006.01) G05B 19/05 (2006.01) G06F 21/00 (2006.01)

Patent

CA 1103362

PROGRAM PROTECTION MODULE FOR PROGRAMMABLE CONTROLLER Abstract of the Disclosure A program protection module for a programmable controller checks the critical, or protected, portion of the control program each time the controller is switched to the run mode. This is accomplished by reading each control program instruction out of the controller memory and comparing it with a corresponding control instruction stored in a nonaccessible read- only memory. If all the compared control instructions are identical, the module sets a status bit in the programmable controller which enables the protected portion of the control program to be executed. If identity is not found, an alarm is generated and the protected program is not executed.

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