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The 4100U-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 4100U-S1 has two bays: the CPU bay and one expansion
bay.
In the standard 4100U-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” 4100U modules. Older 4100-style motherboards can also be
mounted in the expansion bay.
Continued on next page
Introduction to 4100U-S1 Cabinet
Overview
Bays