4.7 Connecting to the Highway and Setting up the Profibus Card
The Profibus Mk2 variants allow for different highway connections. The ‘single channel’ can be used
for simple highways, and where there is an analogue transmitter connected it will also return the value
from the transmitter signal. The ‘dual channel’ (both Simple and RedCom compliant) is used for
redundant highway applications where the highway integrity (SR mode) or the physical connection is
important (FR mode).
4.7.1 Single Highway with Analogue Input
With the single channel option the actuator is connected to only one highway and an additional input is
provided for measuring and reporting an analogue variable. The connection of the actuator to the
highway uses terminals A and B (in and out terminals), the terminal numbers depend on the actuator
type and are indicated on the actuator wiring diagram. The highway should be arranged so as to
eliminate any stub connections. The last actuator on the highway should have the termination resistor
connected by linking the highway ‘A Out’ terminal to the ‘Terminator’ terminal (blue link in diagram
above) and fitting the internal links LK1 and LK2 in the Terminate position. Take care to ensure that
the correct polarity is observed on the data highway connection, all the A terminals must be used on
one data line and all the B terminals on the other.
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