Siemens S7-400 Profibus Optical Bus Terminal OBT, Features of the Fiber-Optic Cables

Networking

PROFIBUS Optical Bus Terminal (OBT)

A PROFIBUS node can be connected to the optical PROFIBUS-DP network via a PROFIBUS Optical Bus Terminal (OBT) (6GK1 500-3AA00) without an integrated fiber-optic cable interface (e.g. programming devices (PGs) or operator panels (OPs), see Figure 5-13).

The programming device/PC is connected to the RS 485 interface of the OBT by means of the PROFIBUS cable. The OBT is integrated in the optical PROFIBUS-DP line by means of its fiber-optic cable interface.

5.8.1Fiber-Optic Cables

Features of the Fiber-Optic Cables

Use Siemens plastic and PCF fiber-optic cables with the following features:

Table 5-4 Features of the Fiber-Optic Cables

	Description		SIMATIC NET PROFIBUS
		Plastic Fiber-Optic		Plastic Fiber-Optic	PCF Fiber-Optic
		Duplex Conductor		Standard Cable	Standard Cable
Standard designation		I-VY2P 980/1000		I-VY4Y2P 980/1000	I-VY2K 200/230
		150A		60A	10A17+8B20
Field of application		Indoors with a low		Indoor applications:	Indoor applications:
		mechanical load,		Cable lengths up to	Cable lengths up to
		such as laboratory
				50 m	300 m
		test assemblies or in
		cabinets:
		Cable lengths up to
		50 m
Fiber type				Step-index fiber
Core diameter		980 μm			200 μm
Core material		Polymethyl methacrylate (PMMA)			Quartz glass
Cladding outer diameter		1000 μm			230 μm
Cladding material			Fluorinated special polymer
Inner sheath
•	Material	PVC		PA	--
•	Color	Gray		Black and orange	(Without inner sheath)
•	Diameter	2.2  0.01 mm		2.2 ± 0.01 mm
Outer sheath
•	Material	--		PVC	PVC
•	Color			Purple	Purple
Number of fibers			2
Attenuation at		≤ 230 dB/km			≤ 10 dB/km
wavelength		660 nm			660 nm

5-24	Automation System S7-400	Hardware and Installation
		A5E00850741-01