Siemens SIMATIC ET 200AL - Connecting the Cable Shielding for et 200 AL

Cable shielding
4.3 Connecting the cable shielding for ET 200AL
Designing interference-free controllers
20 Function Manual, 06/2014, A5E03461486-AB
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 Connect functional ground via a ground wire
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).