PROline Promag 50 4Wiring
Endress+Hauser 55
4.2.3 HART connection
Users have the following connection options at their disposal:
• Direct connection to transmitter by means of terminals 26 / 27
• Connection by means of the 4...20 mA circuit
!
Note!
• The measuring loop's minimum load must be at least 250 Ω.
• After commissioning, make the following settings:
CURRENT SPAN function → “4–20 mA HART” or “4–20 mA (25 mA) HART”
• See also the documentation issued by the HART Communication Foundation, and in
particular HCF LIT 20: “HART, a technical summary”.
Connection of the HART handheld communicator
Fig. 35: Electrical connection of the HART handheld communicator:
1 = HART communicator, 2 = power supply, 3 = shield, 4 = other evaluation devices or PLC with passive input
Connection of a PC with an operating software
In order to connect a PC with an operating software (e.g. “FieldTool”), a HART modem
(e.g. “Commubox FXA 191”) is needed.
Fig. 36: Electrical connection of a PC with an operating software:
1 = PC with an operating software, 2 = power supply, 3 = shield, 4 = other evaluation devices or PLC with
passive input, 5 = HART modem, e.g. Commubox FXA 191
+26
≥Ω250
-27
1
3
4
2
1
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