5 Electrical installation
WirelessHART Adapter SWA70
34
Hauser
5.3
Wiring diagrams for wide range power unit
For the WirelessHART Adapter with a wide range power unit, the following options are available to
electrically connect a field device:
5.3.1
Field device in a closed-control loop without a communication
resistor
The following functions are possible with this connection version:
• Current measurement in the 4 to 20 mA range
• Digital HART communication if this is supported by the field device.
Connect the WirelessHART Adapter as illustrated below:
Fig. 5-9: WirelessHART Adapter with wide range power unit –
connection of a field device in a closed-control loop without a communication resistor
Connection options
Installation in a closed-control loop
• Without a communication resistor, see Page 34.
• With a communication resistor, see Page 35.
Installation, independent
• Two-wire field device, see Page 36.
• Four-wire field device, see Page 36.
• Multidrop, see Page 37.
1
WirelessHART Adapter terminals 1 to 6
2
Field device
3
PLC, remote I/O or DC voltage power unit without a
communication resistor
1
2
3
4
5
6
24 V
+
+
–
–
+
–
1
3
2
24 –
230 V
