WirelessHART Adapter SWA70
5 Electrical installation
Hauser
41
5.5
Wiring diagrams for intrinsically safe power unit
For the WirelessHART Adapter with an intrinsically safe power unit, the following options are
available to electrically connect a field device:
5.5.1
Field device in a closed-control loop without a communication
resistor or two-wire field device
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.
To communicate with the WirelessHART Adapter, connect the HART modem to terminals 5 and 6
or to terminals 7 and 8.
Connect the WirelessHART Adapter as illustrated below:
Fig. 5-18: WirelessHART Adapter with intrinsically safe power unit –
connection of a field device in a closed-control loop without a communication resistor or
connection of a two-wire field device
Note!
• As identically safe power supply systems do not provide sufficient output power, two separate
power supply systems are also needed to power a two-wire field device.
Connection options
Installation in a closed-control loop
• Without a communication resistor, see Page 41.
• With a communication resistor, see Page 42.
Installation, independent
• Two-wire field device, see Page 41.
• Four-wire field device, see Page 43.
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
+
+
–
–
1
2
3
Содержание SWA70
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