Siemens S7-400PLC Specifikace Strana 240

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Analog modules
5.15 Connecting loads/actuators to voltage outputs
S7-400 Automation System Module Data
240 Reference Manual, Edition 09/2009, A5E00850736-06
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
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
Figure 5-20 2-conductor connection of loads to a voltage output of an electrically isolated analog
output module
See also
Connecting loads/actuators to analog outputs (Page 237)
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