Independent Operation of Control Hardware and a Monitoring System in an Automation Controller
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United States of America Patent
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Issued Date -
Apr 30, 2015
app pub date -
Oct 31, 2013
filing date -
Oct 31, 2013
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Abstract
The subject matter disclosed herein describes an improved system for self-monitoring of an industrial controller. Two processors are provided on a control board for the industrial controller. One of the processors is designated the control processor and executes the control program for the industrial control system. The other processor is designated the monitoring processor and verifies proper operation of the controller. The monitoring processor verifies proper operation of the industrial controller and is in communication with the control processor. The control processor periodically verifies that the monitoring processor is operational. If the monitoring processor ceases operation, the control processor generates a warning message and provides for a delayed shutdown of the industrial controller. The control processor may copy the current state of the industrial controller to memory. After a technician has corrected the problem with the monitoring processor, the control processor may restore the stored state of the industrial controller.
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