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Appendix D: Redundancy
April 2013
Figure D-5. Dual RS-485 Architecture
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.
Power
Power for the redundant Gateways should be applied after all primary and secondary Ethernet
and RS-485 connections have been made. Using separate uninterruptable power supplies (UPS)
is recommended to ensure availability of the redundant Gateway system.
Engineering Station
Process Control Network
Controller and I/O
Dual Serial Card
RS-485 Bus
RS-485 Bus
S
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