Siemens SIMATIC NET PROFIBUS User Manual
Active Components for RS-485 Networks
5-15
PROFIBUS Networks SIMATIC NET
6GK1970-5CA20-0AA1 Release 2 05/2000
6GK1970-5CA20-0AA1 Release 2 05/2000
5.7
PROFIBUS Terminator
What is a PROFIBUS Terminator?
The PROFIBUS terminator provides active termination for the bus. The major
advantage of this is that bus nodes can be turned off, removed, or replaced without
impairing data transfer. This applies in particular to the nodes at both ends of the
LAN cable on which the terminating resistors would have to be activated and
supplied with power. The PROFIBUS terminator can be installed on a standard rail.
advantage of this is that bus nodes can be turned off, removed, or replaced without
impairing data transfer. This applies in particular to the nodes at both ends of the
LAN cable on which the terminating resistors would have to be activated and
supplied with power. The PROFIBUS terminator can be installed on a standard rail.
Order number
6ES7 972-0DA00-0AA0
Design of the PROFIBUS Terminator
Table 5-4 shows the design of the PROFIBUS terminator:
Table 5-4
Design of the PROFIBUS Terminator
Design of the PROFIBUS Terminator
No.
Function
SIEMENS
À
LED 24 V power supply
PROFIBUS
TERMINATOR
TERMINATOR
Á
Connection for power supply 24 V DC
1
DC
24 V
24 V
Â
PROFIBUS attachment
2
3
4
L+ M PE
A1 B1
6
Ã
Shield clamp grounding the braid shield and for
strain relief of the LAN cable
strain relief of the LAN cable
6
Ä
Ground screw
6ES7 972-0DA00-0AA0
5
Å
Cable clamp for strain relief of the power supply
cable
cable