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What causes Vijeo Designer error FDH-9494H?

This error indicates that one of the variables you are reading on the panel that displays this error has an invalid data length or device address. The best way to determine which object is invalid is to delete the variables / objects using the divide-and-conquer method.

Once you determine which object is invalid, check what is wrong with its device address. You may need to re-link your PLC symbol file if it is an unlocated variable.
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