Mark s Posted October 9, 2017 Report Share Posted October 9, 2017 I am working with a third party Modbus Analog I/O module. The analog input address that I read from is 300001( double word). In the master, I read input holding register for address 0 and get the correct value. In the PLC the tag is a int32 The analog Output address that I need to write to is 400001(also double word). I have tried writing a int32 into 0,1,2,3 in the slave. I have written to 40001 I have tried changing between single and multiple writes. I change what I was writing from to int16's and wrote four words. I have looked through most all the documentation I can find and haven't been able to get an understanding of how to write to that register that has the same 400001. Quote Link to comment Share on other sites More sharing options...
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