Revision 6 HC900 Process & Safety Controller User and Installation Manual 25
21 April 2017
I/O Expansion Rack
I/O expansion ("remote") racks, shown in Figure 8, are available to accommodate additional input/output modules,
and/or to enable location of I/O modules close to the process and remote from the controller. For C75/C75S, all I/O
is in a rack or racks separate from the controller rack.
Scanner type must match controller type. i.e. example S50S may only be used with C50S, or C70S. S50S cannot be
used with a C50 or C70.
An I/O expansion rack includes:
1. Rack, available in 4- 8-, or 12-slot versions
2. Power Supply
3. Scanner 1 Module (S50/S50S) (shown) or Scanner 2 Module (S75/S75S)
4. Grounding bars (for I/O wiring; optional; required for
safety applications)
5. Input/Output modules
6. I/O Terminal Blocks
7. Power Status Module (PSM)
(req’d if using Reserve Power Supply)
8. Reserve Power Supply (optional). Available in 8- or 12-
slot racks.
Figure 8 – I/O Expansion Rack Components
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