Siemens Automation System S7-400 User Manual Page 122

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Networking
5-24
Automation System S7-400 Hardware and 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 c able. 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:
Table 5-4 Features of the Fiber-Optic Cables
Description
SIMATIC NET PROFIBUS
Plastic Fiber-Optic
Duplex Conductor
Plastic Fiber-Optic
Standard Cable
PCF Fiber-Optic
Standard Cable
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 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
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
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