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What causes error FDH-9494H to appear on a Magelis HMI?

This error indicates that one of the variables you are reading 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 in Vijeo Designer.

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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