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What would cause Modsoft error 109 "PLC returned undefined exception" when trying to go online to the PLC?

Published date: 03 April 2018

Modsoft error 109 ""PLC returned undefined exception" when trying to go online to the PLC is usually caused by the PLC being in "Kernel" mode (Run light flashing). Cycle power on the PLC and if the Run light still flashes, download the executive firmware to see if you can get the Run light to stop flashing.

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