Yokogawa YVP20S - Manual (Page 17)

3-3
IM 21B04C50-01E
<Toc> <Ind> <3. INSTALLATION OF HARDWARE AND SOFTWARE>
3.2.1 Wiring requirements
Note that there are cable requirements that must be met for reliable installations. The cable
used must support the digital data signals without reflections, noise or attenuation. The
type A cable should be used whenever possible and especially for long transmission
distances or for segments with many branches (spurs).
● Power conditioner
Use a power conditioner for each segment. The conditioner must be foundation fieldbus
compliant. The power conditioner functions to isolate the digital signals from the power
source.
● Power supply
The YVP positioner complies with the foundation specification voltage requirements of 9 to
32 volts. The power supply must conform to these requirements with consideration for the
current drawn by all devices powered by the segment. The YVP maximum current
consumption is 17 mA.
● Terminator
Every fieldbus segment requires two (and only two) approved terminators. Terminators are
passive circuits that damp signal reflections in the circuit. For simple segments having
short runs and few spurs, the terminator location can be at each end of the longest cable.
For very short cables both terminators can even be located in the power conditioner.