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37
Reference Manual
00809-0100-2240, Rev DA
October 2017
4.4.6
The Tankbus
The Rosemount Tank Gauging system is easy to install and wire. Field devices can be “daisy-chained” thus
reducing the number of external junction boxes. Devices communicate with a Rosemount 2410 Tank
Hub via the intrinsically safe Tankbus that complies with the FISCO
(1)
F
OUNDATION
fieldbus standard. The
Rosemount 2410 acts as power supply to the field devices on the Tankbus. A FISCO system enables more
field devices to be connected to the segment compared to conventional I.S. systems based on the entity
concept.
Termination
A terminator is needed at each end of a F
OUNDATION
fieldbus network. Generally, one terminator is placed
at the fieldbus power supply, and the other one at the last device in the fieldbus network.
Note
Ensure there are
two
terminators on the Tankbus, see
.
In a Rosemount Tank Gauging system the Rosemount 2410 Tank Hub acts as power supply. Since the tank
hub normally is the first device in the fieldbus segment, the built-in termination is enabled at factory.
Devices such as the standard version of 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.
If the Rosemount 2240S is not the last device in the fieldbus network, disconnect the termination
jumper. See
.
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
. 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 tank hub is able to deliver 250 mA. In a Smart Wireless System the
maximum current is 200 mA. Consequently, the number of field devices has to be considered so that the
total current consumption is less than the available current. See section “Power Budget” in the
Rosemount 2410 Reference Manual
for more information.
Another requirement is to ensure that the input voltage at the field device terminals is at least 9 V.
Therefore, the voltage drop in the fieldbus cables has to be taken into account.
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
).
See the
Rosemount 2410 Reference Manual
for more information on segment design of a Rosemount
Tank Gauging system.
1,
FISCO=Fieldbus Intrinsically Safe Concept
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