Siemens SIMATIC S7-400 Reference Manual page 221

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