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The STB NIB 1010 Basic NIM Module
26
890USE19600 April 2004
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 basic segment.
External Source
Power
Input from an external 24 VDC power supply 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).
Logic Power
Flow
The figure below shows how the NIM’s integrated power supply generates logic
power and sends it across the basic segment:
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
island.
Failure to follow this precaution can result in injury or equipment
damage.
24 VDC
24 V
5V