Connecting Et 200Al To Functional Earth; Mounting Et 200Al Modules On Conductive Substrate - Siemens SIMATIC ET 200AL System Manual

5.4

Connecting ET 200AL to functional earth

Introduction
You must connect the distributed I/O system ET 200AL to functional earth (FE)
What is functional earth?
All ET 200AL modules feature a functional earth connection. This connection is used to
suppress interference sensitivity, but not for protection purposes. With the functional earth
connection, you create an electrical connection directly to a point of your system or shielding.
This discharges the EMC interference directly into the earth. By discharging the EMC
interference, the interference safety of the entire module is increased.
The figure below shows the symbol with which the functional earth connection is identified on
the ET 200AL modules.
Figure 5-5
5.4.1

Mounting ET 200AL modules on conductive substrate

Requirement
Conductive substrate for mounting of the module
Required tools
To connect to functional earth, you need the following tools:
● Screwdriver
Required accessories:
To connect to functional earth, you need the following accessories:
● 2 x M4 fastening screws.
Distributed I/O system
System Manual, 08/2019, A5E31861578-AG
Functional earth
5.4 Connecting ET 200AL to functional earth
Connecting
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