Schneider Electric INTERBUS Basic Spécifications télécharger pdf (Page 37)

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.

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Schneider Electric INTERBUS Basic Spécifications Page 37