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 communications 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 (PE)
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. 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
20
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
Operating Instructions, 10/2018, C79000-G8976-C512-01