Connecting The Cable Shielding For Et 200Al - Siemens SIMATIC ET 200AL System Manual

Cable shielding

4.3 Connecting the cable shielding for ET 200AL

4.3 Connecting the cable shielding for ET 200AL
Each module of the ET 200AL distributed I/O system features a functional ground
connection.
Use only shielded cables for connection of analog signals, PROFINET and PROFIBUS
signals and for the ET-Connection. If you have screwed the plug in correctly, the interference
currents that occur are diverted to the metal parts and functional ground.
If you attach an ET 200AL module to a conductive, grounded base, the lower mounting bolt
establishes a conductive connection to the earth potential.
If you attach an ET 200AL module to a non-conductive base, connect the lower mounting
bolt to the ground wire at the same time.
The following figure shows how to connect the functional ground via a ground wire, using the
IM 157-1 PN interface module as an example.
Figure 4-4
Additional information
You can find more information on installing ET 200AL modules in the Installing Modules
section of the system manual Distributed I/O System ET 200AL
(http://support.automation.siemens.com/WW/view/en/89254965).
20
Connect functional ground via a ground wire
Designing interference-free controllers
Function Manual, 06/2014, A5E03461486-AB