Honeywell ControlEdge 900R04-0200 Getting Started page 20

Chapter 3 - Hardware
Item Description
mode switches on the primary and secondary CPMs are in different
positions, the system will drop sync.
5 First (ETH1) and second Ethernet (ETH2) Host ports to PC applications and/or
other CPMs, or other devices.
6 Third (ETH3) and fourth (ETH4) ports connect to the Ethernet ports of EPM,
switch (for star topology), or CPM (for the interconnection between redundant
CPM in Ring topology).
7 Ethernet LED status indicators for communications functions.
Item Description
1 Status LED indicator for EPM functions.
2 Role LED indicator for EPM functions.
3 Ethernet 10/100 Base-T Ports; connect to the ports on other EPMs, CPM, or a
switch that connects to the CPM (for star topology).
20
Expansion Processor Module (EPM)
EPM (900SP1-0200) is installed in the expansion I/O rack and
provides the link between the CPM and remote I/O modules.
The EPM is shown in the following figure.