I/A Series G3 Modbus TCP communications to random Modbus devices randomly drop offline and stop communicating with the ENC or Enterprise Network Server. Both the modbusCore and modbusTcp modules are at version 3.6.31.
I/A Series G3, Modbus TCP 3.6.47 and lower
There were a few updates to the Modbus core and TCP modules between 3.6.31 and 3.6.47.
- Issue 18656 corrected communication reliability when there are a large number of Modbus TCP devices under a single ModbusTcpNetwork.
- Issue 19897 corrected transaction ID synchronization when a retry occurred.
- Issue 23578 added the ability to control the maximum transactionID used for ModbusTcp (Lessons Learned article 10888).