Connect Cm To Functional Ground (Pe); Mounting The Cm On A Conductive Base - Siemens SIMATIC RF185C Operating Instructions Manual

5.3

Connect CM to functional ground (PE)

You need to connect the RF18xC communications module to functional ground (PE). For this
purpose, a grounding screw for one ground conductor is provided on the communications
module.
If a grounded metal mounting surface is used, the bottom mounting screw of the RF18xC
module already establishes a reliable ground connection. This eliminates the need for a
separate ground conductor.
The connection to functional ground (PE) is also required to deflect the interference currents
and for electromagnetic compatibility.
Protection against external electrical influences
Below is a description of what you must pay attention to in terms of protection against
electrical impacts and/or faults:
● In all plants or systems in which the communications module is installed, you must ensure
that the plant or the system for dissipating electromagnetic interference is connected to
functional ground.
● For supply, signal and bus lines, you must ensure that the laying of the lines and the
installation is correct.
● For signal and bus lines, you must ensure that a wire/cable breakage or a cross-circuit
does not lead to undefined states of the plant or system.
5.3.1

Mounting the CM on a conductive base

Requirement
Conductive base for mounting the module.
Required tools
You need the following tool to connect to the functional ground:
● Screwdriver
Accessories required
You need the following accessories to connect to the functional ground:
● Fastening screw (M4) and washer
SIMATIC RF185C, RF186C, RF188C
Operating Instructions, 10/2018, C79000-G8976-C512-01
5.3 Connect CM to functional ground (PE)
Connection
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