20
100 %
0 %
4mA
20mA
Output current
Input value
Analog
Input 1 Input 2
4-20 mA
4-20 mA
Technical changes reserved
HTG410H
Power supply and Input / Output cabling
6.6 Current loops 4-20 mA
Two 4-20 mA DC current loops are available on the energy server.
The two-wire 4-20 mA control loops, are used to convert various
process signals representing flow, speed, position, level, tempera-
ture, pressure, pH, etc., to 4-20 mA DC. The use of 4 mA as the
starting point for the transmitted signal is useful in trouble-shooting,
as signal integrity is verified with 0% of input and output signal.
A failed current loop due to a lead break or open device can be
immediately discerned as zero current flow, which is a fail-safe level
outside of the signal range.
Length and cross section
Up to 10 m max,
0,25 mm² minimum
Type of cable
Screened twisted pair cable
Reading frequency
1 Hz
Accuracy
± 0.5°% of the whole scale
Applicable standard
EN 61131-2
QC small
(mm
2
)
0.2…1.5
(mm
2
)
0.2…1.5
/
(mm)
8
(mm
2
)
Connections
Input value
Output current
