Selecting The Baseunit For I/O Modules; Digital, Fail-Safe, Communication, Technology Or Analog Modules Without Temperature Measurement - Siemens SIMATIC ET 200SP System Manual

Application planning

4.1 Selecting the BaseUnit for I/O modules

4.1 Selecting the BaseUnit for I/O modules
4.1.1 Digital, fail-safe, communication, technology or analog modules without
temperature measurement
Selection of a suitable BaseUnit
①
Light-colored BaseUnit: Configuration of a new potential group, electrical isolation from adjacent module on the left.
The first BaseUnit of the ET 200SP is usually a light-colored BaseUnit for feeding the supply voltage L+.
Exception: If you insert an AC I/O module or an AI Energy Meter as the first I/O module, the first BaseUnit in the
ET 200SP configuration can be a dark-colored BaseUnit. The requirement is that you use a CPU or IM 155-6 (as of
V3.0).
Dark-colored BaseUnit: Conduction of the internal power and AUX buses from the adjacent module on the left.
②
AUX terminal: 10 internally bridged terminals for individual use up to 24 V DC/10 A or as protective conductors.
Example: Multiple cable connection for DI 8×24VDC ST
Figure 4-1 Digital, fail-safe, communication, technology or analog modules without temperature measurement
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Distributed I/O system
System Manual, 09/2019, A5E03576849-AJ