Schneider Electric INTERBUS Basic Spécifications télécharger pdf (Page 11)

Introduction

31004624 8/2009 11

Integrated Power Supply

The NIM’s built-in 24-to-5 VDC power supply provides logic power to the I/O

modules on the primary segment of the island bus. The power supply requires a

24 VDC external power source. It converts the 24 VDC to 5 V of logic power for the

island. Individual STB I/O modules in an island segment generally draw a logic bus

current of between 50 and 265 mA. (Consult the Advantys STB System Planning

and Installation Guide for current limitations at various operating temperatures.) If

the logic bus current drawn by the I/O modules totals more than 1.2 A, additional

STB power supplies need to be installed to support the load.

The NIM delivers the logic power signal to the primary segment only. Special

STB XBE 1300 beginning-of-segment (BOS) modules, located in the first slot of

each extension segment, have their own built-in power supplies, which provide logic

power to the STB I/O modules in the extension segments. Each BOS module that

you install requires 24 VDC from an external power supply.

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Schneider Electric INTERBUS Basic Spécifications Page 11