Tankbus - Emerson Rosemount 2410 Reference Manual

Reference Manual
00809-0100-2410, Rev DA
3.4.7

Tankbus

The Rosemount Tank Gaugingsystem is easy to install and wire. Devices can be "daisy-chained" thus
reducing the number of external junction boxes.
In a Rosemount Tank Gaugingsystem the field devices communicate with a Rosemount 2410 Tank Hub
via the intrinsically safe Tankbus. The Tankbus complies with the FISCO
The Rosemount 2410 acts as a power supply to the field devices on the Tankbus.
The tank hub 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
the longest cable path between two devices on the fieldbus network. In the Rosemount Tank
Gaugingsystem, a trunk is typically located between the Rosemount 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
Note
Ensure that there are two terminators on the fieldbus.
In a Rosemount Tank Gaugingsystem the Rosemount 2410 Tank Hub acts as a power supply. The tank
hub is normally the first device in the fieldbus segment, and the built-in termination is enabled at factory.
Other 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
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
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
Consequently, the total number of field devices has to be considered so that the total current
consumption is less than 250 mA, see
Since the field devices on the Tankbus must have at least a 9 V input voltage at their terminals, you will
have to take into account the voltage drop in the fieldbus cables. In many cases distances are relatively
short between the Rosemount 2410 and field devices on the tank and you may use existing cables as
long as the FISCO requirements are fulfilled (see
1, FISCO=Fieldbus Intrinsically Safe Concept
2, In Smart Wireless Systems the Rosemount 2410 can deliver 200 mA on the Tankbus
Installation
OUNDATION
OUNDATION
"Cable selection for the Tankbus" on page
"Power budget" on page
"Cable selection for the Tankbus" on page
(1)
F fieldbus standard.
OUNDATION
fieldbus network. A trunk is defined as
Figure 3-7 on page
™
fieldbus network, the termination is
27.
(2)
28.
Installation
March 2017
36.
mA.
27).
29