VEGA VEGABAR 74 4 … 20 mA_HART - Manual (Page 22)

7 .2 Connect the PC with VEGACONNECT 4
2 4
3
1
OPEN
TW IST USB
LO CK
Fig. 9: Connecting the PC via HART to the signal cable
1
VEGABAR 74
2 HART resistance 250 Ohm (optional depending on the processing)
3 Connection cable with 2 mm pins and terminals
4 Processing system/PLC/Voltage supply
N ecessary components:
l
VEGABAR 74
l
PC
with PACTware™ and suitable VEGA DTM
l
VEGACONNECT 4
l
HART
resistance 250 Ohm (optional depending on the
processing)
l
P
ower supply unit or processing system
Note:
W
ith power supply units with integrated HART resistance
(
internal resistance approx. 250 Ohm), an additional external
resistance is not necessary. This applies, e.g. to the VEGA
instruments VEGATRENN 149A, VEGADIS 371, VEGAMET
381). A
lso usual Ex separators are most of the time equipped
with a sufficient current limitation resistor. In such cases,
VEGACONNECT
4 can be connected parallel to the 4 … 20 mA
cable.
Connection via HART
22 VEGABAR 74 - 4 … 20 mA/HART
S etup with PACTware™
28432
-EN
-070718