Siemens SIMATIC NET PROFIBUS - Manual (Page 417)

4.4 Installation
21
4 Setting Up
Version 1.0 8/00
4.4.2 Mounting the modules
The OLM modules can either be mounted on a 35 mm hat
rail in accordance with DIN EN 50022 or directly on to a
flat surface.
ᮣ Install the device in a location where the climatic and
mechanical limit values defined in the Technical Data
can be complied with.
ᮣ Ensure that there is sufficient room to connect the bus
and power supply cabling.
ᮣ Connect the optical fiber line before mounting the
module. This is easier than connecting it after the
module has been installed.
ᮣ Only mount the module on a low-impedance and
low-induction grounded hat rail or base plate. No
other grounding measures are required.
Mounting on a hat rail
ᮣ Hang the top snap-in hooks of the module into the hat
rail and press the underside onto the rail (as shown in
Fig. 7) until it audibly clicks in.
ᮣ To remove the module, pull down on the locking slide.
Mounting on a mounting plate
The modules have three through-holes. This allow it to be
mounted on any flat surface, e.g. on the mounting plate of
a switch cabinet.
ᮣ Drill three holes in the mounting plate corresponding to
the drilling template in Fig. 8.
ᮣ Secure the modules with machine bolts (e.g. M 3 x 40).
ᮣ Ensure that there is a reliable electrical connection
between the module housing and the mounting plate.
Place toothed washers under the bolt heads to pierce
the varnish.
Fig. 8: Mounting a module on a mounting plate
Locking slide
Toothed washer
CH 1
CH 1
System
PROFIBUS OLM
CH 2
CH 3
GND
Receive
Signal Intensity
CH 2 CH 3
61.2 mm
40.6 mm
81.2 mm
Ø 3 mm
Ø 3 mm
Fig. 7: Mounting a module on a standard hat rail