Procedure For Commissioning; Installation - Siemens SIMATIC NET OBT Operating Instructions Manual

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Transient overvoltages

Take measures to prevent transient overvoltages of more than 40% of the rated voltage (or

more than 119 V). This is the case if you only operate devices with SELV (safety extra-low

voltage).

Suitable cables at high ambient temperatures in hazardous area

If the device is operated at max. ambient temperature, only use cables with permitted

maximum operating temperature of at least 90 ℃. The cable entries used on the enclosure

must comply with the IP degree of protection required by EN IEC / IEC 60079-0, GB 3836.1.

6.1

Procedure for commissioning

Commissioning the PROFIBUS OBT involves the following steps:

• Mounting the PROFIBUS OBT;

• Connecting the power supply;

• Connecting the optical bus cables;

• Connecting the electrical RS-485 bus cable.

6.2

Mounting the PROFIBUS OBT

The PROFIBUS OBTs can be mounted either on a 35 mm DIN rail with a height of 15 mm

according to DIN 50 022 - 35 x 15 or directly on a flat surface.

1. Install the device so that the climatic limit values in the technical specifications are adhered

to.

2. Make sure that there is adequate space to connect the bus and power supply cables.

3. Mount the modules only on a rail or mounting plate that is grounded with low resistance and

inductance. When securing the module to a mounting plate, run a cable from the grounding

terminal of the OBT to the nearest possible ground, keeping the cable as short as possible.

Mounting on a DIN rail

Fit the upper catch of the module over the DIN rail and push in the lower part of the module as

shown in Figure 5-1 until it clicks in place.

PROFIBUS Optical Bus Terminal (OBT)

Operating Instructions, 06/2022, C79000-G8976-C122-08

WARNING

Commissioning

6.2 Installation

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