Honeywell 900U02-0100 - Connecting the Operator Interface to the Controller

142 ControlEdge HC900 Process & Safety Controller User and Installation Manual Revision 10
May 2019
I/O
100Base-T
2 or more I/O racks
Shielded Ethernet
CAT5 cable with RJ-
45 connectors
C75 CPU A’s I/O port to
approved unmanaged
switch. From this
unmanaged switch to
each Scanner 2’s I/O A
port. One (1) additional
unmanaged switch may
be used, for a total of 2
unmanaged switches
between CPU A and the
I/O racks.
C75 CPU B’s I/O port to
approved unmanaged
switch. From this
unmanaged switch to
each Scanner 2’s I/O B
port. One (1) additional
unmanaged switch may
be used, for a total of 2
unmanaged switches
between CPU B and the
I/O racks.
No foreign messaging
permitted
7.3. Connecting the Operator Interface to the Controller
Using parts in Table 20 connect the Operator Interface to the galvanically isolated RS-485 port on the
controller for legacy systems. For new systems, the parts in Table 20 connect to either of the two
galvanically isolated RS-485 ports on the controller. See page 38 for port location. Typically, the cable
that interconnects this port to the Operator Interface must be made during installation, because it will
probably be necessary to run the cable through conduit.
On C75 connect cable from each CPU’s galvanically isolated RS-485 port to the Operator Interface. See
Operator Interface manual #51-52-25-108 for connection details.