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M90 Exp. Error

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I have Used M91 controllers and not M90 but generally I would expect that message to mean that the PLC is looking for a remote IO module and is not getting a working data connection between the M90 and the remote module. The would be a loss of commincation at a cable that should be plugged into the PLC's RJ45 expansion port.

I have no paperwork on M90 units so I am just guessing here.


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  • 2 weeks later...


It is a loss of communication, If this condition was present on power-up it is because the controller can not communicate with the IO. To resolve this type of condition please ensure the expansion modules have power prior to the PLC upon start up. This can be confirmed if cycling power on the PLC only resolves the condition until the next full power cycle.

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