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FAQ00277 of Programmable Controllers FAQ

FAQ No. FAQ00277

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What are the conditions under which a C200HX/HG/HE Programmable Controllers will detect a power interruption when used with C200HW-PA204 Power Supply Units at 100 VAC?


A power interruption to C200HX/HG/HE will be detected under the following conditions. If the power supply voltage drops below 85% of the rated voltage, the CPU Unit will stop and the outputs will turn OFF depending on the length of the interruption.

The CPU Unit will not respond to the power interruption and will continue to run unconditionally if the power is interrupted for less than 10 ms.

If the power interruption lasts more than 25 ms, the system will stop, and outputs will turn OFF.

If the power interruption lasts more than 10 ms but less than 25 ms, the CPU Unit may or may not respond to the power interruption. In this case, the operation of the CPU Unit cannot be predicted.

The time it takes to detect a power interruption can be extended using a setting in the Programmable Controllers Setup (DM 6605).