Rosemount 2240S, Reference Manual

Page: 38 / 100

Reference Manual
300550en, Rev AA
December 2010
Rosemount 2240S
4-12
Section 4. 2240S Installation
4.4.9 Daisy-chain
Connection
The Raptor system supports daisy-chain connection of devices to the
Tankbus. To daisy-chain the 2240S to other devices do the following:
1. Make sure the power supply is switched off.
2. Loosen the four screws and remove the cover on the terminal
compartment.
3. Disconnect the termination jumper from the X3 terminal, see Figure 4-4
on page 4-11.
4. Run the Tankbus cable into the Rosemount 2240S through an
appropriate gland.
5. Connect the Tankbus wires to the X2 output and X3 output terminals as
illustrated in Figure 4-4.
6. Connect the cable shield to the X1 terminal.
7. Attach and tighten the cover on the terminal compartment. Ensure the
cover sealing is placed in the correct position.
8. Tighten the conduit/cable glands. Note that adapters are required for
M20 glands.
A typical wiring diagram of a Raptor system with a Rosemount 2240S is
illustrated in Figure 4-5. In the example below the 2240S is daisy-chained to a
Rosemount 5900S Radar Level Gauge and a Rosemount 2230 Graphical
Field Display:
Figure 4-5. Rosemount 2240S
wiring diagram
Ensure that there are only two terminators enabled on the Tankbus. In the
example above, one terminator is enabled in the 2410 Tank Hub. The second
terminator is enabled in the terminal compartment of the 2230 Display since
this is the last device on the Tankbus segment. Incorrect terminations may
cause malfunctioning communication on the Tankbus.
Tankbus
TankMaster PC
2160 Field
Communication Unit
2410 Tank Hub
2230 Display
Field Bus
Modem
TRL2 Modbus Group bus
5900S Radar
Level Gauge
2240S Multi-input
Temperature
Transmitter
Built-in
terminator
enabled on the
last device