Ethernet port on Gateway B. Then wire the RS-485 ports for both Gateways separately to
dual serial cards at the host system. See Figure D-6 Dual RS-485 Architecture.
Figure D-6: Dual RS-485 Architecture
A. Engineering station
B. Process control network
C. Controller and I/O
D. Dual serial card
E. RS-485 bus
F. Secondary Ethernet
Note
By default, only the active Gateway in a redundant system will respond to Modbus polling
requests. If simultaneous polling is desired, login to the Gateway web interface, navigate
to Setup>Modbus>Communications and set “Respond when running as redundant
standby?” to Yes. Only use this setting in a dual RS-485 architecture.
Reference Manual Redundancy
00809-0200-4420 September 2020
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