Siemens SIMATIC ET 200M Operating Instructions Manual page 64

Installation
4.2 Installation
Fixing Screws
You have a choice of the following screw types for fixing the rail.
For ...
Outer fixing screws
additional fixing screw
(only 2-meter rail)
Installing the mounting rail
To install the rail, proceed as follows:
1. Choose a position for the rail that leaves enough room to install it properly and enough
2. Connect the rail to the base (screw size: M6).
3. Connect the rail to the protective conductor. An M6 screw is provided for this purpose on
Note
Ensure that your connection to the protective conductor is low-impedance (see the
following figure). If the ET 200M is mounted on a hinged rail, for example, you must use a
flexible cable to establish the connection to the protective conductor.
62
space to cope with the temperature rise of the modules. Observe the minimum clearance
distances of 40 mm above and below the rail.
Is this base a grounded metallic plate or a grounded device supporting plate?
If not: No particular steps are required.
If so: Ensure there is a low-impedance connection between the rail and the base. In the
case of painted or anodized metals, for instance, use a suitable contacting agent or
contact washers.
the rail.
Minimum cross-section of the cable to the grounding wire: 10 mm
you can use ...
Fillister head screw M6 in
accordance with
ISO 1207 / ISO 1580
(DIN 84 / DIN 85)
Hexagon head screw M6 in
accordance with ISO 4017
(DIN 4017)
Fillister head screw M6 in
accordance with
ISO 1207 / ISO 1580
(DIN 84 / DIN 85)
Operating Instructions, 12/2008, EWA-4NEB780600602-08
Description
Choose a suitable screw length for
your configuration.
You also require washers 6.4 in
accordance with ISO 7092
(DIN 433).
.
2
ET 200M