Terminating Resistors
In order to minimize the reflection effect of the signal transmission,
PROFIBUS device has to fit with an active terminal resistor at both first
node and last node. The connection of active terminating resistors is shown
in above circuit diagram. The PROFI-8455 doesn’t have any terminating
resistors inside. Therefore, users must add the terminator in external. In
general, PROFIBUS connector has terminating resistors inside, and there
is a switch to control the ON/OFF of the terminating resistors, as shown
below.
Terminator Switch
Terminator OFF
Terminator ON
