Networking
5-24 AutomationSystem S7-400 Hardwareand Installation
A5E00850741-01

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.

5.8.1 Fiber-Optic Cables

Features of the Fiber-Optic Cables

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

Table5-4 Features of the Fiber-Optic Cables
Description SIMATICNET PROFIBUS
PlasticFiber-Optic
DuplexConductor
PlasticFiber-Optic
StandardCable
PCF Fiber-Optic
StandardCable
Standard designation I-VY2P 980/1000
150A
I-VY4Y2P 980/1000
60A
I-VY2K 200/230
10A17+8B20
Field of application Indoors with a low
mechanical load,
such as laboratory
test assemblies or in
cabinets:
Cable lengths up to
50 m
Indoor applications:
Cable lengths up to
50 m
Indoor applications:
Cable lengths up to
300 m
Fiber type Step-index fiber
Core diameter 980 μm200μm
Core material Polymethyl methacrylate (PMMA) Quartz glass
Cladding outer diameter 1000 μm230μm
Cladding material Fluorinatedspecial polymer
Inner sheath
Material
Color
Diameter
PVC
Gray
2.2 0.01 mm
PA
Black and orange
2.2 ±0.01 mm
--
(Without inner sheath)
Outer sheath
Material
Color
-- PVC
Purple
PVC
Purple
Number of fibers 2
Attenuation at
wavelength
230 dB/km
660 nm
10 dB/km
660 nm