Honeywell ControlEdge 900 platform

I/O rack
I/O rack can include a topology with; either a non-redundant power
supply or with redundant power supplies, accommodate a CPM or an
EPM, and additional input/output modules. The I/O rack inserted with
an EPM enables I/O modules to be located close to the field devices
and remote from the CPM.
Figure 5-4: I/O rack with non-redundant power supply
Figure 5-5: I/O rack with redundant power supplies
As indicated in I/O rack with non-redundant power supply section and
I/O rack with redundant power supplies section, the I/O rack includes:
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