Power Status Module
The Power Status Module (PSM), shown in the following figure, sits
between redundant power supplies on the I/O rack. It is a status
module for both power supplies and indicates which are powered, PS-
1 (left) or PS-2 (right) or both (typical).
When the status indicator for either or both of the power supplies is
lit, it is reporting that the status of the associated power supply is
good and that the outputs are within specified limits. When the status
is off, either the power supply is off or the voltages are out of
tolerance.
Figure 5-12: Power Status Module
Expansion Processor Module
EPM is shown in the following figure.
Figure 5-13: Expansion Processor Module
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