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Analog Value Processing
10.8.1 Connecting Loads to Analog Output Modules
When loads are connected to analog output modules, the voltage is measured directly across the
load via high-resistance sensing lines (S+/S -). The output voltage is then corrected so that the
load voltage is not falsified by voltage drops on the lines.
In this way it is possible to compensate voltage drops of up to 3 V per line.
Figure 10-27 shows the design of this circuit.
QV (x)
S+ (x)
S - (x)
QI (x)
I
M
ANA
10-56
+
Load
voltage
-
+
Load
current
-
Figure 10-27. Connecting Loads
S5-115U Manual
QV
(x)
=
Analog output voltage
(QV=Output voltage)
QI
(x)
=
Analog output current
(QI=Output current)
S+
(x)
=
Sensing line+
(S+=Sensing line+)
S -
(x)
=
Sensing line-
(S -=Sense line -)
M
=
Ground terminal of the
ANA
analog component
x
=
Channel no. (0 to 7)
EWA 4NEB 811 6130-02b
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