Mounting The Communications Module - Siemens SIMATIC RF185C Operating Instructions Manual

Mounting

4.2 Mounting the communications module

4.2 Mounting the communications module
Introduction
The communication modules are designed for mounting on a flat, solid surface. Alternatively,
you can use the axially symmetrical drill holes of the modules to fasten them to an aluminum
profile using sliding blocks.
Note
Functional ground
If a grounded metal mounting surface is used, the bottom mounting screw of the
RF18xC/RF18xCI module already establishes a reliable grounding connection. This
eliminates the need for a separate ground conductor. If you use the fixing screw as
grounding connection, the thread of the fixing screw or the contact facing of the fastening nut
on the base must be unpainted. This ensures a low-resistance connection.
Requirements
The following table shows and explains the types of screws you need to mount the modules.
Table 4- 1
Screw type
Cylinder head screw M4 according to DIN EN
ISO 1207 / DIN EN ISO 1580
Cylinder head screw with M4 hex socket accord-
ing to DIN EN ISO 4762
22
Recommended screw types
Description
The minimum screw length should be 35 mm.
If you need washers, use washers conforming to
DIN EN ISO 7089 / DIN EN ISO 7090.
SIMATIC RF185C, RF186C, RF188C, RF186CI, RF188CI
Operating Instructions, 04/2020, C79000-G8976-C512-03