Emerson Rosemount 5300 Series - Page 285

External power supply
The input voltage U
i
for Modbus is 8-30 Vdc (max. rating).
Wiring diagram
Figure A-10: Wiring Diagram for RS-485 with Modbus
®
-
+
$
%
&&
(
)
+
*
'
A. “A” line
B. “B” line
C. 120 Ω
D. RS-485 Bus
E. Power supply
F. HART -
G. HART +
H. If it is the last transmitter on the bus, connect the 120 Ω termination resistor.
Note
Rosemount 5300 Level Transmitters with Flameproof/Explosion-proof output have a built-
in barrier; no external barrier needed.
(13)
Power consumption
• < 0.5 W (with HART address=1)
• < 1.2 W (incl. four HART slaves)
Note
The Rosemount 5300 Level Transmitter with Modbus protocol is configured to HART
address 1 at factory. This reduces power consumption by locking the analog output at 4
mA.
(13)
An external galvanic isolator is always recommended to be used for Flameproof/Explosion-proof installations.
Reference Manual Specifications and reference data
00809-0100-4530 April 2019
Reference Manual 285