Figure 5: Typical Multi-Tier Lan Application (Star/Bus Topology); Figure 6: Typical Multi-Tier Lan Application (Ring Topology) - Emerson PACSystems RX3i User Manual

PACSystems™ RX3i and RSTi-EP CPU Reference Manual
GFK-2222AK
2.3.1.5 Ethernet Topology
A typical application will take advantage of the two independent LANs. The dedicated
LAN1 port will be used for communications with plant-level or supervisory layers. The
switched LAN2 will be used to communicate with devices over PROFINET within the
manufacturing cell or process.

Figure 5: Typical Multi-Tier LAN Application (Star/Bus Topology)

RSTi-EP Node 1
Whenever CPE100/CPE115 is configured for MRP only Ethernet Port2 & Port3 of LAN2 can
be used to form a ring. Ethernet Port4 of LAN2 can still be used either to connect
programmer, simplex PROFINET device or any other supported Ethernet protocols.

Figure 6: Typical Multi-Tier LAN Application (Ring Topology)

CPU Features & Specifications
Modbus RTU Master
QP+
PROFINET MRP
RX3I CEP Node 2 Rx3i PNS Node 3
RSTi-EP CPE100/115
Switch
VersaMax PNS Node 4
PROFINET
Modbus RTU(RS-232)
OPC-UA Client
MODBUS TCP/SRTP
Quick Panel+
OPC-UA Client
Section 2
October 2019
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