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Appendix C
February 2019
Figure 9-6: Ethernet Connection Architecture
B
A. Engineering station
B. Process control network
C. Gateway A
D. Gateway B
E. Primary Ethernet
F. Secondary Ethernet
Note
The primary Ethernet port for each network should be connected to separate network
switches on the same process control network. Consult a control system administrator for
more details about available redundant network switches.
Simplex RS-485
A simplex RS-485 host connection supports Modbus RTU protocol. When using this
architecture, connect the secondary Ethernet port on Gateway A directly to the secondary
Ethernet port on Gateway B. Then wire the RS-485 ports for both Gateways in parallel to a
single serial card at the host system. See Figure D-5, Simplex RS-485 Architecture.
60
A
D
C
F
E
Reference Manual
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