Siemens SIMATIC ET 200PA SMART Operating Instructions Manual page 34

Installation
3.2 Installation
Fixing screws
You have a choice of the following screw types for fixing the mounting rail.
For ...
Outer fixing screws
Additional fixing screw
(only 2-meter mounting
rail)
Installing the mounting rail
To install the mounting rail, proceed as follows:
1. Choose a position for the rail that leaves enough room for installation and heat dissipation
of the modules. Observe the minimum clearances of at least 40 mm above and below the
mounting rail.
2. Screw the mounting rail to the base (screw size: M6).
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 mounting rail and the base.
In the case of painted or anodized metals, for instance, use a suitable contacting agent or
contact washers.
3. Connect the mounting rail to the protective conductor. An M6 protective conductor screw is
provided for this purpose on the mounting rail.
Minimum cross-section of the cable for the protective conductor: 10 mm
Note
Ensure that your connection to the protective conductor is low-impedance (see the following
figure). If the ET 200PA SMART is mounted on a movable rack, for example, you must
provide a flexible cable for the protective conductor.
34
you can use ...
Cylinder head screw M6 in accord‐
ance with ISO 1207 / ISO 1580
(DIN 84 / DIN 85)
Hexagon head screw M6 in accord‐
ance with ISO 4017 (DIN 4017)
Cylinder head screw M6 in accord‐
ance with ISO 1207 / ISO 1580
(DIN 84 / DIN 85)
Explanation
Choose a suitable screw length for
your configuration.
You also require washers 6.4 in ac‐
cordance with ISO 7092 (DIN 433).
2
Operating Instructions, 06/2019, A5E34192013-AB
.
ET 200PA SMART