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Page 36
SITRANS LG200 – INSTRUCTION MANUAL
7ML19985KA02
Wiring
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.
PLC with mA
input card
PC/laptop with
HART modem
running PDM
HART
Communicator
375
SITRANS LG200
power supply
R= 250 Ohms
Loop Voltage versus Loop Resistance
650
24 V DC
20 mA
23 mA
V DC
Ω
11
Содержание 7ML1301-1
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