Connecting Cm To Functional Ground; Mounting The Cm On A Conductive Base - Siemens SIMATIC RF166C Operating Instructions Manual

Connecting

5.3 Connecting CM to functional ground

5.3 Connecting CM to functional ground
5.3.1 Connecting CM to functional ground
You need to connect the RF166C communication module to functional ground. For this
purpose, a grounding screw for one ground conductor is provided on the communication
module.
If a grounded metal mounting surface is used, the bottom mounting screw of the RF166C
module already establishes a reliable grounding connection. This eliminates the need for a
separate ground conductor.
This connection to functional ground is also required to discharge any interference currents
to ground and for EMI resistance.
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 communication 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.
5.3.2

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
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Operating Instructions, 12/2019, C79000-G8976-C578-01
SIMATIC RF166C