Rosemount TankRadar Rex
Chapter 1 Checks and Adjustments
1-4
Commissioning Manual
308011En, Ed.2/Rev.B
June 2008
1.6
FBM 2180 checklist
1.6.1
FBM information
•
Note the name and version of each FBM.
1.6.2
Visual check
•
Note if the FBM is installed outdoors or in the control room.
•
Check if there is anything in the surroundings which may disturb
the communication such as electromagnetic fields like radiators,
big motors and transformers.
1.6.3
Field bus check
•
Check that the TRL/2 bus is connected to socket 2 and 3. Use
twisted and shielded single pair cable with minimum cross sec-
tional area 0.50 mm
2
.
Table 1-1: Recommended wiring length
•
Connect the shield to terminal 1 or 4.
•
Connect ground cable to terminal 1 or 4.
1.6.4
Power supply
•
Do not use external power supply when the modem is connected
to the USB port. The USB interface itself supports power to the
FBM 2180 modem.
Cable dimension
Maximum length
AWG 20 (0.50 mm
2
)
3000 m
AWG 18 (0.75 mm
2
)
4000 m
Figure 1-2
FBM 2180
TRL/2 bus
