Siemens SIMATIC NET PROFIBUS User Manual

5-3

PROFIBUS Optical Bus Terminal (OBT)
C79000-G8976-C122-02

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.

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Select the installation location so that the climatic limit values listed in the
technical specifications can be adhered to.

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Make sure there is enough space for connecting the bus and power supply
cables.

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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.

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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.

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The module is removed by pulling down the locking bar.

Figure 5-1

Installation of a Module on a Standard Rail