Honeywell HC900 - Page 144

130 HC900 Process & Safety Controller User and Installation Manual Revision 6
21 April 2017
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