Siemens CPU 312C

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S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
6-6 A5E00105492-03
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1. When you mount the rails, allow sufficient space for mounting modules and heat
elimination (at least 40 mm above and below the modules. See the figure
below).
2. Mark up the mounting holes on the mounting surface. Drill the holes to a
diameter of 6.5
+0,2
mm.
3. Screw on the rail (M6 screws).
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Take care to create a low-impedance connection between the rail and a
mountin
g
surface which is a
g
rounded metal plate or equipment mountin
g
plate.
In the case of varnished or anodized metals, for instance, use a suitable
contacting agent or contact washers.
20
mm
SIEMENS
40 mm
40 mm
20
mm
Figure 6-2 Free space required for an S7-300 installation