Not all modules have a hard-coded register to read; digital Input 1 (DI1) for the 7650 is and example of such.
If there is a need to read a module that does not have a hard-coded register, map that module to a modbus slave module and read the modbus slave modules output register.

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Legacy KB System (APS) Data: RESL212298 V1.0, Originally authored by EdFa on 08/14/2013, Last Edited by EdFa on 08/14/2013
Related ranges: ION7550/ION7650