VEGA VEGASON 54K…56K - Manual (Page 10)

10 VEGASON 54K … 56K
4 … 20 mA
2
2
2
2
3
4
- +
Measuring system consisting of VEGASON 54K … 56K with PLC
• Output signal 4 … 20 mA active
• Display module integrated into the sensor
• Optional external indicating instrument with analogue and digital indication (can be mounted
up to 25 m from the sensor in Ex area)
• Adjustment with PC, HART ® handheld or adjustment module MINICOM (pluggable in the
sensor or in the external VEGADIS 50 indicating instrument)
HART ® handheld
VEGA-
CONNECT 2
Types and versions
1) If the resistance of the processing systems con-
nected to the 4 … 20 mA signal output is less than
200
Ω
, a resistor must be connected to the con-
nection cable during adjustment, to reach an ad-
justment load of 200
Ω
to 350
Ω
.
The digital adjustment signal would otherwise be
extremely damped or short circuited because of in-
sufficient resistance of the connected processing
system. Communication with the PC would no
longer be ensured.
1 )
VEGADIS 50
active 2)
2) 4 … 20 mA active means, that the sensor delivers
a level-dependent current of 4 … 20 mA (source).
With respect to the processing system (e.g. dis-
play), the sensor acts electrically as a current
source.
3) 4 … 20 mA passive means that the PLC consumes
a level-dependent current of 4 … 20 mA. The PLC
acts electrically as a resistor (consumer).
PLC
passive
3)