Specifications

Table Of Contents
64
Reference Manual
00809-0100-4026, Rev HA
Section 4: Electrical Installation
November 2014
Electrical Installation
Alternatively, the Rosemount 5400 Series Transmitter can be installed as shown in Figure 4-18.
If this wiring layout is used, there is an increased risk for communication disturbances due to
differences in potential between grounding points. By using the same grounding point for
Modbus Master and Power Supply, this risk is reduced.
Figure 4-18. Alternative Multidrop Connection of Rosemount 5400 Series Transmitters
Star topology
For a star topology connection of the Rosemount 5400 Series transmitters, the transmitter with
the longest cable run needs to be fitted with a 120 termination resistor.
Figure 4-19. Star Topology Connection of Rosemount 5400 Series Transmitters
MODBUS
POWER
HART
(RS-485)
HART to Modbus Converter
MB
MA
-
-
+
+
MODBUS
POWER
HART
(RS-485)
HART to Modbus Converter
MB
MA
-
-
+
+
Ambients > 60 ºC
Use wiring rated
for min 90 ºC
Ambients > 60 ºC
Use wiring rated
for min 90 ºC
Power
supply
120 W
120
RS-485 bus
B
A
Modbus
master
Z
External
ground screw
External
ground screw
Internal
ground screw
Internal
ground screw
MODBUS
POWER
HART
(RS-485)
HART to Modbus Converter
MB
MA
-
-
+
+
MODBUS
POWER
HART
(RS-485)
HART to Modbus Converter
MB
MA
-
-
+
+
MODBUS
POWER
HART
(RS-485)
HART to Modbus Converter
MB
MA
-
-
+
+
MODBUS
POWER
HART
(RS-485)
HART to Modbus Converter
MB
MA
-
-
+
+
MODBUS
POWER
HART
(RS-485)
HART to Modbus Converter
MB
MA
-
-
+
+
MODBUS
(RS-485)
v
erter
MB
MA
-
Ambients > 60 ºC
Use wiring rated
for min 90 ºC
Ambients > 60 ºC
Use wiring rated
for min 90 ºC
Ambients > 60 ºC
Use wiring rated
for min 90 ºC
Ambients > 60 ºC
Use wiring rated
for min 90 ºC
Ambients > 60 ºC
Use wiring rated
for min 90 ºC
For a star topology
connection, connect
the 120
termination resistor
to the transmitter
with the longest
cable run.