
Cabling and Wiring the System
6-20
SIMATIC 545/555/575 System Manual
6.3 Installing PROFIBUS-DP I/O Cables
The PROFIBUS-DP I/O channel provides serial communication over either
of the following:
• Shielded twisted pair (RS-485) cable media
• Glass or plastic fiber optic media
This section describes the twisted pair RS-485 cable. If you are installing a
glass or plastic fiber optic system, follow the instructions in the SINEC
L2/L2FO Network Components Manual, order number 6GK1
970–5CA00–0AA1.
Figure 6-11 shows a simple I/O system layout for the PROFIBUS-DP
interface. On the PROFIBUS-DP I/O channel, the CPU is a master and I/O
devices are slaves.
PROFIBUS-DP
field bus
P/S
P/S
Local I/O
R
B
C
Local I/O
slave #2
slave #3
slave #112
.
PROFIBUS-DP
I/O link
to RBC
Up to 112 PROFIBUS-DP
devices (with repeaters)
C
P
U
CPU with
PROFIBUS-DP
I/O interface
PROFIBUS-DP
RBC,
PPX:505–6870
slave #1
Figure 6-11 Sample System Layout for PROFIBUS-DP
Media Options
System Layout
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