Kepware Knowledge Base: Solution
Unable to Read Using Symbolic Addresses in GE RX3/7i That Are Referencing IO Registers
Last Update: 11/7/2018
Problem:
As soon as an existing IO or memory location is referenced in the PLC in a Symbolic register, the PLC changes it from a user-defined type to a mapped type. The call to the device for that type is different.
Solution:
Until a change is made to the driver, users can only map those types to regular memory.
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