The 4100ES-S1 cabinet contains the CPU, operator interface, system power supply (SPS),
backup batteries, and any additional modules that the panel requires.
These items are organized into sub-assemblies called bays or card frames, each with a
swing-down front door. The 4100ES-S1 has two bays: the CPU bay and one expansion
bay.
In the standard 4100ES-S1, the CPU bay contains the SPS and the CPU Motherboard
with CPU Daughter card. The front of the bay holds the Operator Interface, consisting of
the LCD, keyboard, and fault sounder. Older 4100-style motherboards can be mounted in
the CPU bay.
The expansion bay has a PDI (Power Distribution Interface) backplane into which can be
plugged a number of 4” x 5” 4100ES modules. Older 4100-style motherboards can also
be mounted in the expansion bay.
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