Siemens SIMATIC ET 200SP System Manual page 67

Installation
5.1 Basics
General rules for installation
Hazardous Voltage
Can Cause Death, Serious Injury, or Property Damage.
Hazardous electrical voltage can cause electric shock, burns and property damage.
Disconnect your system and devices from the power supply before starting any assembly
tasks.
Observe the following rules:
● Installation starts on the left-hand side with the CPU/interface module.
● A light-colored BaseUnit BU..D0, BU30-MS1 or BU30-MS3 with infeed of supply voltage
L+ follows the CPU/interface module or is placed at the start of each potential group.
If you use a CPU or IM 155-6 (V3.0 or higher), the first BaseUnit in the installation of the
ET 200SP may also be a dark-colored BaseUnit of type B1 or D0.
● This is followed by BaseUnits BU..B, BU30-MS2 or BU30-MS4 (with a dark-colored
terminal box).
● The matching I/O modules / motor starters can be plugged onto the BaseUnits. You will
find matching combinations of BaseUnits and I/O modules / motor starters in Application
planning (Page 33).
● The server module completes the configuration of the ET 200SP distributed I/O system.
Note
Mount the ET 200SP distributed I/O system only with disconnected supply voltage.
Protection from conductive contamination
Taking into account the environmental conditions, the devices must be protected from
conductive contamination.
This can be achieved, for example, by installing the devices in a control cabinet with the
appropriate degree of protection.
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WARNING
WARNING
Distributed I/O system
System Manual, 09/2019, A5E03576849-AJ