Siemens SIMATIC ET 200AL - 2 xCount Parameter Explanations; General Parameter Explanations (2 xCount)

Connecting
5.4 Connecting ET 200AL to functional earth
Distributed I/O system
System Manual, 02/2018, A5E31861578-AF
37
Mounting
To connect modules of the ET 200AL distributed I/O system to functional earth with a
conductive mounting substrate, proceed as follows:
1. Drill two fastening holes.
2. Screw the module with the M4 fastening screws using a torque of 1.2 Nm.
Note
Earthing with conductive mounting substrate
When you fasten a module of the ET
200AL distributed I/O system on a conductive,
grounded substrate, the bottom fastening screw provides a conductive connection to the
ground potential.
Ensure that there is a low
-impedance connection between the module and conductive
underground as well as betwe
en the conductive underground and functional earth.
Reference
You will find more information on installing the modules in the section Mounting modules
(Page 24).
5.4.2
Mounting ET 200AL modules on non-conductive substrate
Requirement
Conductive substrate for mounting of the module
Required tools
To connect to functional earth, you need the following tools:
● Screwdriver
● Stripping tool
● Crimp tool
Required accessories:
To connect to functional earth on a non-conductive fastening substrate, you need the
following accessories:
● 2 x M4 fastening screws.
● Cable lug suitable for M4 screws
● Grounding cable (braided copper cable) with a minimum cross section of 4 mm
2