Foundation Fieldbus; Topology; Electrical Considerations - K-TEK AccuTrak AT100 Installation & Operation Manual

5.0 COMMUNICATION OPTIONS

5.3 Foundation Fieldbus

5.3.1 Topology

Fieldbus
Phase
Power
The device may be installed in either a Bus or Tree topology.
Neutral
Supply
Ground
Bus Topology
Analog
Panel
Ground
Ground
Phase
Neutral
Ground
Panel
Ground
Tree Topology
Fieldbus
Phase
Power
Neutral
Supply
Ground
Analog
Panel
Ground
Ground
Phase
Neutral

5.3.2 Electrical Considerations

Ground
Power Supply:

The transmitter requires between 9 and 32 V dc to operate and provide complete functionality. The DC
power supply should provide power with less than 2% ripple.

Various types of Fieldbus devices may be connected on the same bus.

The AT is powered via the bus. The limit for such devices is 16 for one bus (one segment) for
Panel
non-intrinsically safe requirement.
Ground
intrinsically safe restrictions. The AT is protected against reverse polarity, and can withstand ±35 VDC
without damage.
Power Filter:
A Fieldbus segment requires a power conditioner to isolate the power supply filter and decouple the
segment from other segments attached to the same power supply.
AT100-0200-1 Rev L (10-2010) DCN0528
Junction Box
Junction Box
Spur
Fieldbus
Bus Topology
Power
Supply
Analog
Ground
Bus Topology
Junction Box
Terminator
Junction Box
Fieldbus
Power
Supply
Terminator
Analog
Ground
Spur
Shield
Coupler
-
+
Spur
Shield
Coupler
-
+
Spur
-
+
Coupler
-
-
+
+
Coupler
-
+
In hazardous area, the number of devices may be limited by
-
+
Terminator
Spur
-
-
+
+
Terminator
-
+
Spur
Shield
-
+
-
Shield
+
-
+
-
+
16