Forming Potential Groups; Basics - Siemens Simantic ET200SP System Manual

3.4

Forming potential groups

3.4.1

Basics

Introduction
Potential groups for the ET 200SP distributed I/O system are formed by systematically
arranging the BaseUnits.
Requirements
For formation of potential groups, the ET 200SP distinguishes between the
following BaseUnits:
● BaseUnits BU...D (recognizable by the light-colored terminal box and the light-colored
mounting rail release button):
– Opening of a new potential group (power and AUX bus interrupted to the left)
– Infeed of the supply voltage L+ up to an infeed current of 10 A
● BaseUnits BU...B (recognizable by the dark-colored terminal box and the dark-colored
mounting rail release button):
– Conduction of the potential group (power and AUX bus continued)
– Pick up of the supply voltage L+ for external components or loop-through with a
● BaseUnits BU30-MSx (BaseUnit for the motor starter only)
Depending on the version, the BaseUnits in the "BU30-MSx" model series possess the
following properties:
– Opening a new potential group or continuing an existing one
– Feeding in the supply voltage L+ up to an infeed current of 7 A DC
– Opening a new load group or continuing an existing one by means of 500 V AC infeed
– Feeding in the line voltage up to an infeed current of 32 A AC
Distributed I/O system
System Manual, 12/2016, A5E03576849-AG
maximum total current of 10 A
bus
Application planning
3.4 Forming potential groups
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