Connecting Hart - Siemens SITRANS LG200 Series Instruction Manual

Connecting HART

Typical PLC/mA configuration with HART
•
Notes:
• For error-free communication via the HART protocol, a 250 Ohm resistor may be
required if the loop resistance is less than 250 Ohms.
• Only one HART communication device should be inserted in the loop.
power supply
SITRANS LG200
Loop Voltage versus Loop Resistance
Ω
Page 36
PLC with mA
input card
R= 250 Ohms
20 mA
650
11
SITRANS LG200 – INSTRUCTION MANUAL
HART
Communicator
375
23 mA
24 V DC
V DC
PC/laptop with
HART modem
running PDM
7ML19985KA02