Specifications

The STB NIB 2212 NIM Module
31004624 8/2009 37
Logic Power
Introduction
Logic power is a 5 VDC power signal on the island bus that the I/O modules require
for internal processing. The NIM has a built-in power supply that provides logic
power. The NIM sends the 5 V logic power signal across the island bus to support
the modules in the primary segment.
External Source Power
Input from an external 24 VDC power supply (see page 39) is needed as the source
power for the NIM’s built-in power supply. The NIM’s built-in power supply converts
the incoming 24 V to 5 V of logic power. The external supply must be rated safety
extra low voltage (SELV-rated).
CAUTION
IMPROPER GALVANIC ISOLATION
The power components are not galvanically isolated. They are intended for use
only in systems designed to provide SELV isolation between the supply inputs or
outputs and the load devices or system power bus. You must use SELV-rated
supplies to provide 24 VDC source power to the NIM.
Failure to follow these instructions can result in injury or equipment damage.