Download CIMPLICITY HMI Server Redundancy Operation

Modbus RTU Communications
Server redundant computer configurations that use the Modbus RTU Communications
option must be configured as in the following diagram:
The programmable controller needs to respond through both of its serial cards at the same
slave address at the same time. However, the slave node is only heart beating. It is not
reading the full data set. The master node reads the full data set.
Important: Because both RTU cards have the same ID they have to be in separate
networks.
GFK-1353F
Appendix A - Using Supported Communication Interfaces
A-7