Allen Bradley Micro820 Modbus RTU Slave RS-232

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PLC: 2080-LC20-20AWB
USB to Serial RS-232 Adapter: GUC232A
1. Programming
2. Pinout
PLC User Manual - Chapter 1 -Page 4
literature.roc...
USB to Serial RS-232 Adapter
3. Wiring
4. Testing…
Modscan32

[@PardeepLabVIEW]

Great going dear

[@kiansionglau9581]

I follow above all the method, and i can send the value from modscan32 to micro800, but i unable receive micro800 from modscan32, Error: modbus exception response from slave device. can you advise this? i try 485 also same issue.

[@SYPHOANG]

@KianSiong Lau: I think you might want to check the logic in your program. For example, you move data from a PLC to Modscan32 for Modbus write and you move data from Modscan32 to a PLC for Modbus read. How many data registers do you have in the Modbus mapping in your PLC program?