Siemens AS 488/TM manual Optical bus terminal OBT for Profibus, Transmission media

This catalog is out of date, see note on page 3

Bus communication

PROFIBUS-TM

PROFIBUS-TM

Optical bus terminal (OBT) for PROFIBUS

The OBT (optical bus terminal) is used to connect a PROFIBUS station without an integral optical interface to an optical line with PROFIBUS stations with integral interface and OBT.

The PROFIBUS station is connected to an RS 485 interface of the OBT via a cable terminated at both ends, e.g. connecting cable 830-1T. The OBT is linked into the optical cable using two optical interfaces.

Please refer to Catalog IK PI "Industrial communications and field devices" and the SIMATIC NET manual "PROFIBUS net- works" (6GK1 970–5CA20–0AA0) for detailed information on these components and on further components for PROFIBUS networks.

■Ordering Data

	Order No.
RS 485 bus connector for
PROFIBUS with 35° cable outlet
Max. transmission rate 12 Mbit/s,
degree of protection IP 20
• Without programming device in-	6ES7 972-0BA40-0XA0
terface
• With programming device inter-	6ES7 972-0BB40-0XA0
face
RS 485 bus connector for	6GK1 500-0EA02
PROFIBUS with axial cable
outlet
Max. transmission rate 1.5 Mbit/s,
degree of protection IP 20

Transmission media

The ordering data include the transmission media for all types of PROFIBUS connection referred to above and recommended for use with the AS 388/TM and AS 488/TM automation systems.

Please refer to Catalog IK PI "Industrial communications and field devices" for further components and for information on pos- sible bus configurations.

The following table lists the max. permissible cable lengths which can be achieved with the used data transmission rate of

1.5 Mbit/s:

Max. cable length of an RS 485 segment	200 m
Max. distance between 2 stations	800 m
(with 3 RS 485 repeaters in series)
Max. cable length between 2 OBTs with PCF fiber-	300 m
optic cable
Max. distance between 2 OLMs/G12 and fiber-optic	3 km
cable (wavelength 860 nm)

System connection for AS 488/TM

EXM 478 module with IF 964 interface module

An AS 488/TM automation system can only be connected to ei- ther the PROFIBUS-TM or CS 275 system bus.

The AS 488/TM automation system is connected to PROFIBUS- TM via an IF 964 interface module in an EXM 478 extension module. The standard connection is the interface module in the second extension module. One of the three slots in the first EXM 478 module can be used if they are not all occupied al- ready. However, this requires adaptation of the interface assign- ment in the initialization files when configuring.

Bus connectors or bus terminals can be plugged directly onto the IF 964 interface module.

RS 485 bus terminal for

PROFIBUS

with 1.5-m connecting cable

•Without programming device in- terface

•With built-on programming de- vice interface

Optical link module for

PROFIBUS, OLM/G12

Optical link module for glass fiber-optic cable, with signalling contact, 4-channel version

Optical bus terminal for

PROFIBUS, OBT

Optical bus terminal for connec- tion of a PROFIBUS station, with- out integral optical interface to the optical PROFIBUS, without Sim- plex connector

830-1 cable connector for PC/programming device and OLM for PROFIBUS

1.5m long

3 m long

Bus cables for PROFIBUS

2-core, shielded, cut to length: Max. delivery unit 1000 m, mini- mum ordering length 20 m

•Standard cable

•Bus cable with PE sheath, for food and drink industry

Fiber-optic cable

Standard cable, can be fanned out, cut to length

(specify length in .... m)

Max. available length 4000 m

BFOC connector

for standard fiber-optic cable, 20 units

EXM 478 extension module

to accommodate 3 interface mod- ules

IF 964-DP interface module

6GK1 500-0AA10

6GK1 500-0DA00

6GK1 502-3CB00

6GK1 500-3AA00

6XV1 830-1BH15 6XV1 830-1BH30

6XV1 830-0EH10 6XV1 830-0GH10

6XV1 820-5AH10 Length: ... m

See Catalog IK PI for precut/pre- assembled cables

6GK1 901-0DA20-0AA0

6ES7 478-2AC00-0AC0

6ES7 964-2AA01-0AB0

9/4 Siemens PLT 112 · 2002