Siemens SIMATIC NET PROFIBUS - Manual (Page 130)

Passive Components for RS-485 Networks
4-32
PROFIBUS Networks SIMATIC NET
6GK1970-5CA20-0AA1 Release 2 05/2000
4.3 Bus Connectors
Uses
Using the bus connector for SIMATIC NET PROFIBUS:
S
Nodes with an electrical 9-pin sub-D interface complying with EN 50170 can be
connected directly to the SIMATIC NET PROFIBUS cables
S
Electrical segments or individual nodes can be connected to the optical link
module (OLM, OBT).
S
Nodes or programming devices can be connected to a repeater.
Note
The integrated bus terminators and the mechanical specifications of the SIMATIC
NET bus connectors are tailored to the SIMATIC NET PROFIBUS cables (cable
type A of the PROFIBUS standard EN 50170-1-2). Fitting bus connectors to
cables with different electrical or mechanical properties can cause problems during
operation!