Siemens ST PCS 7 User Manual

PROFIBUS DP

Siemens ST PCS 7 · November 2007

9

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We recommend use of glass fiber optic cables with 2 multi-mode 

fibers for optical PROFIBUS networks in indoor and outdoor ar-

eas.
The standard FIBER OPTIC CABLE is available in fixed lengths 

for distances up to 2000 m, preassembled with 4 BFOC connec-

tors. A BFOC connector set with 20 connectors is available as an 

accessory. 
Further fiber optic cables can be found in Catalog IK PI, Chapter 

"PROFIBUS", Section "Optical networks with OLM".

Optical Link Modules (OLM) permit the construction of optical 

and hybrid (electrical/optical) networks in line, ring or star topol-

ogy. The maximum distance between two OLMs can be up to 

15 km for OLMs of type G12-1300 (see Catalog IK PI) and glass 

fiber optic cables with single-mode fibers (on request). The 

PROFIBUS OLM/G12 used as standard is equipped with one 

RS 485 interface and two glass fiber optic cable interfaces 

(4 BFOC sockets). The fiber optic line length between two OLMs 

of this type can be up to 3000 m when using the standard FIBER 

OPTIC CABLE. 
The OLMs have a compact metal housing suitable for DIN rail 

assembly. They automatically recognize all PROFIBUS data 

transfer rates. Faults can be rapidly located as follows:
• Display of module status via floating signaling contact
• Checking of FO link quality (loss per section) via test output for 

optical receivers for logging and plausibility checks.

B) Subject to export regulations: AL: N, ECCN: EAR99H

1)

Note: 

Additional components of the SIMATIC NET wiring range can be ordered 

from your local contact person.

For technical advice contact:

J. Hertlein, A&D SE PS

Tel.: +49 911 750-4465, 

Fax: +49 911 750-9991

E-mail: juergen.hertlein@siemens.com

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Order No.

Pre-assembled with 4 BFOC 

connectors
Preferred lengths
• 1  m

B)

• 5  m

B)

• 10  m

B)

• 20  m

B)

• 50  m

B)

• 100  m

B)

Other lengths and cables 

See Catalog IK PI

1)

For standard and trailing FIBER 

OPTIC CABLES, 20 units

B)

Optical link module with 1 x RS 

485 and 2 x glass FOC interfaces 

(4 BFOC sockets), for standard 

distances up to 3000 m, with sig-

nal contact and measuring output

B)

© Siemens AG 2007