VEGA VEGABAR 87 4 … 20 mA_HART - Operating Instructions - Manual (Page 46)

46
7 Setup with PACTware
VEGABAR 87 • 4 … 20 mA/HART
45044-EN-131010
7 Setup with PACTware
7.1 Connect the PC
3
1
2
Fig. 33: Connection of the PC directly to the sensor via the interface adapter
1 USB cable to the PC
2 Interface adapter VEGACONNECT
3 Sensor
1
5
2 4
3
OPEN
TWIST USB
LOCK
Fig. 34: Connecting the PC via HART to the signal cable
1 Sensor
2 HART resistance 250 Ω (optional depending on processing)
3 Connection cable with 2 mm pins and terminals
4 Processing system/PLC/Voltage supply
5 Interface adapter, for example VEGACONNECT 4
Note:
With power supply units with integrated HART resistance (internal
resistance approx. 250 Ω), an additional external resistance is not
necessary. This applies, e.g. to the VEGA instruments VEGATRENN
149A, VEGAMET 381, VEGAMET 391. Common Ex separators are
also usually equipped with a sufficient current limitation resistance. In
such cases, the interface converter can be connected parallel to the
4 … 20 mA cable (dashed line in the previous illustration).
Via the interface adapter
directly on the sensor
Via the interface adapter
and HART