Siemens SIMATIC NET PROFIBUS manual PE M L+ NEC CLASS2

Installation and Startup

Instructions for Connectoring Plastic Fiber–Optic Cables (with photos)

You can download a detailed instruction brochure with photos illustrating how to connector plastic fiber–optic cables from the Internet:

SGerman: http://www.ad.siemens.de/csi/net

SEnglish: http://www.ad.siemens.de/csi_e/net

Select SEARCH on this page and enter the number 574203 in the Entry ID box and start the search.

Connecting the Power Supply

PE M L+

NEC CLASS2

24VDC, 200 mA

Figure 5-3 Layout of the Terminal Block – Ground Terminal PE and Power Supply

Terminals M, L+

SThe power supply for the PROFIBUS OBT must be a stabilized safety extra-low voltage complying with IEC 950 / VDE 0805, minimum +18 V and maximum

+32 V (typically +24 V). The power source must meet the specifications of NEC class 2 to comply with the UL/CSA approval. The unit is intended to be installed on the load side of the class 2 or class 3 power source as defined by the National Electric Code (NEC), Article 725–2

The module must be wired correctly according to the National Electrical code (NEC) complying with NEC Article 725–52, 725–54, 725–61 and 725–71.

SIf the PROFIBUS OBT is not installed on a grounded rail, a grounding conductor with a cross-section of 2.5 mm2 should be connected from the PE terminal to the nearest possible ground point.

PROFIBUS Optical Bus Terminal (OBT)	5-5
C79000-G8976-C122-02