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Reference Manual
300530EN, Rev BA
September 2012
Rosemount 2410
3-8
Section 3. Installation
3.4.7 Tankbus The Raptor system is easy to install and wire. Devices can be “daisy-chained”
thus reducing the number of external junction boxes.
In a Raptor system the field devices communicate with a Rosemount 2410
Tank Hub via the intrinsically safe Tankbus. The Tankbus complies with the
FISCO
(1)
FOUNDATION fieldbus standard with the Rosemount 2410 acting as a
power supply to the field devices on the Tankbus.
The Rosemount 2410 is designed for use in hazardous area Zone 1 (Class 1,
Division 1) and communicates with field devices via the intrinsically safe
Tankbus.
Termination
A terminator is needed at each end of the trunk in a F
OUNDATION fieldbus
network. A trunk is defined as the longest cable path between two devices on
the fieldbus network. In the Raptor system, a trunk is typically located
between the 2410 Tank Hub and a splitter or the last device in a daisy-chain
configuration. Generally, one terminator is placed in the fieldbus power
supply, and the other one in the last device in the fieldbus network as
illustrated in Figure 3-7.
NOTE!
Ensure that there are two terminators on the fieldbus.
In a Raptor system the Rosemount 2410 Tank Hub acts as a power supply.
Since the 2410 normally is the first device in the fieldbus segment, the built-in
termination is enabled at factory.
Other Raptor devices such as the Rosemount 5900S Radar Level Gauge, the
Rosemount 2230 Graphical Field Display, and the Rosemount 2240S
Multi-input Temperature Transmitter also have built-in terminators which can
easily be enabled by inserting a jumper in the terminal block when necessary.
When adding new devices at the end of an existing F
OUNDATION fieldbus
network, the termination is moved to the farthest field device in order to fulfill
the requirement on locating the terminator at the end of the trunk. However, in
case a field device is added to the network with a short cable, this rule may be
slightly bent by leaving the terminator in its original position.
Fieldbus Segment Design
When designing a FISCO fieldbus segment you will have to make sure that
cabling complies with FISCO requirements as described in “Cable Selection
for the Tankbus” on page 3-6.
You will also have to ensure that the total operating current of the connected
field devices is within the output capability of the Rosemount 2410 Tank Hub.
The 2410 is able to deliver 250 mA. Consequently, the total number of field
devices has to be considered so that the total current consumption is less
than 250 mA, see “Power Budget” on page 3-7.
(1) FISCO=Fieldbus Intrinsically Safe Concept