Siemens Automation System S7-400 - Manual (Page 122)

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 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:
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