Burkert 8640, Operating Instructions Manual

Page: 31 / 196

8640 - 29
PROFIBUS-DP
Terminal resistance
In the PROFIBUS-DP, the two-wire lines of the field bus must be terminated at both ends with resistances.
If the last subscriber is a valve battery, the terminal resistance can be activated through the DIP switch.
The DIP switch is located on the underside of the Bus module, underneath a protective cap.
NOTE
With the high data transfer rates used in the field bus technology, there can be signal
reflections at the end of the field bus branches which cause interference. This can lead to
data errors. By adding terminal resistors, these reflections are suppressed.
Activating the terminal resistors on the underside of the module
➔
Carefully remove the protective cap.
➔
Slide both switches to the rear, into the
ON position!
➔
Replace the protective cap.
Fig.: Activating the terminating resistances