Connecting Hart; Typical Plc Configuration With Hart - Siemens SITRANS LR200 7ML5422 Operating Instructions Manual

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
②
③
32
Power supply
Active PLC
HART modem
④
R=250 Ω
⑤
HART communicator
⑥
SITRANS LR200
Operating Instructions, 05/2019, A5E32337676-AE
SITRANS LR200 with mA/HART