M
ANA
: Reference potential of the analog circuit
M :
Ground
U
ISO
:
Potential difference between M
ANA
and chassis ground
(1)
Chassis ground
2-conductor connection of loads to a voltage output
In the case of a 2-conductor connection, connect Q
V
with S+ and M
ANA
with S on the front
connector. However, this will not provide the accuracy of a 4-conductor connection.
Wire the loads to the Q
V
terminals and to the reference point of measuring circuit M
ANA
.
1
+24 V
L+
Q
V
S+
S-
M
ANA
0 V
M
U
ISO
R
L
Figure 5-19 2-conductor connection of loads to a voltage output of an electrically isolated analog output
module
L +:
Terminal for 24 VDC supply voltage
Q
V
:
Analog output voltage
S +:
Sensing line (positive)
S -:
Sensing line (negative)
M
ANA
: Reference potential of the analog circuit
M :
Ground
U
ISO
:
Potential difference between M
ANA
and chassis ground
(1)
Chassis ground
See also
Connecting loads/actuators to analog outputs (Page 219)
Analog modules
5.15 Connecting loads/actuators to voltage outputs
S7-400 Automation System Module Data
Reference Manual, Ausgabe 11/2016, A5E00850736-08
221