Siemens SIMATIC NET PROFIBUS - Manual (Page 453)

Installation and Startup
5-3
PROFIBUS Optical Bus Terminal (OBT)
C79000-G8976-C122-02
5.2 Installation
Installing the PROFIBUS OBT
PROFIBUS OBT can be installed either on a 35 mm standard rail with a height of
15 mm in compliance with DIN EN 50 022 – 35 x 15 or directly on a level surface.
S Select the installation location so that the climatic limit values listed in the
technical specifications can be adhered to.
S Make sure there is enough space for connecting the bus and power supply
cables.
S
Install the modules only on a low-resistance and low-inductance grounded
standard rail or mounting plate. If you secure the modules on a mounting plate,
make sure that as short a cable as possible leads from the ground terminal of
the OBT to the nearest possible ground point.
Installation on a Standard rail
S Fit the upper catch of the module onto the standard rail and push in the lower
part of the module as shown in Figure 5-1 until it audibly clicks into position.
S
The module is removed by pulling down the locking bar.
Figure 5-1 Installation of a Module on a Standard Rail