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SITRANS LR200 with mA/HART
32
Operating Instructions, 05/2019, A5E32337676-AE
5.2.1
Connecting HART
Note
•
Depending on the system design, the power supply may be separate from the PLC, or
integral to it.
•
HART resistance (total of loop resistance, that is, cable resistance plus 250 Ohm
[resistor]) must be limited according to the allowable operating area as shown in either
diagram under Loop voltage versus loop resistance (Page 190).
•
Do not connect more than one HART programming device at a time.
5.2.2
Typical PLC configuration with HART
①
Power supply
④
R=250
Ω
②
Active PLC
⑤
HART communicator
③
HART modem
⑥
SITRANS LR200