Forming Potential Groups; Basics - Siemens SIMATIC ET 200SP System Manual

4.5

Forming potential groups

4.5.1

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 busbar and AUX bus are interrupted to the
– Feeding in the supply voltages (DC or AC) up to an infeed current of 10 A, depending
● BaseUnits BU...B (recognizable by the dark-colored terminal box and the dark-colored
mounting rail release button):
– Conduction of the potential group (power busbar and AUX bus continued)
– Tapping the supply voltages (DC or AC) for external components or looping through
● 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
– Feeding in and routing the F-DI signal
Note
The BaseUnits BU...B of type B1 and D0 loop through the voltage buses P1/P2 and the AUX
bus. The buses are not tapped by the module.
Distributed I/O system
System Manual, 09/2019, A5E03576849-AJ
left)
on the BaseUnit used.
with a maximum total current of 10 A, depending on the BaseUnit used.
bus
Application planning
4.5 Forming potential groups
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