The Raptor Tankbus - Emerson Rosemount 5900 Reference Manual

Preliminary
Reference Manual
300520EN, Rev AA
November 2009
3.4.7 The Raptor
Tankbus
Section 3. Installation
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 devices communicate with a Rosemount 2410 tank hub
via the intrinsically safe Tankbus. The Tankbus complies with the FISCO
F fieldbus standard. The Rosemount 2410 acts as power supply to
OUNDATION
the field devices on the Tankbus.
Termination
A terminator is needed at each end of a F
Generally, one terminator is placed in the fieldbus power supply, and the other
one in the last device in the fieldbus network.
NOTE!
Ensure that there are two terminators on the fieldbus.
In a Raptor system the Rosemount 2410 tank hub acts as 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 5900 radar level gauge, the
Rosemount 2230 graphical display, and the Rosemount 2240 multi-input
temperature transmitter also have built-in terminators which can easily be
enabled by inserting a jumper in the terminal block when necessary.
Segment design
When designing a FISCO fieldbus segment a few requirements need to be
considered. Cabling has to comply with FISCO requirements as described in
"Cable Selection" on page 3-40.
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 number of field devices
has to be considered so that the total current consumption is less than
250 mA, see "Power Budget" on page 3-40.
Another requirement is to ensure that all field devices have at least 9 V input
voltage at their terminals. Therefore you will have to take into account the
voltage drop in the fieldbus cables.
Distances are normally quite short between the Rosemount 2410 tank hub
and field devices on the tank. In many cases you can use existing cables as
long as the FISCO requirements are fulfilled (see "Cable Selection" on
page 3-40).
See "The Raptor Tankbus" on page 3-7 in the Rosemount 2410 Reference
Manual (Document no. 305030EN) for more information on segment design
of a Raptor system.
(1) FISCO=Fieldbus Intrinsically Safe Concept
Rosemount 5900 Series
Fieldbus network.
OUNDATION
(1)
3-41