Siemens S5-155U System Manual page 485

Connecting loads to voltage
outputs
QV 0
S + 0
+
-
S - 0
M
ANA
Figure 9-41 Connecting Loads
Four-wire circuit
System Manual
C79000-B8576-C109-03
If, with voltage outputs, an excessively great voltage drop must be
expected on the lines to the load, you must route the sensor lines S+(x)
and S-(x) to the load.
When voltage outputs are not used, the S+(x) sensor lines in the front
connector must be connected to the corresponding voltage output
terminals (QV(x)) with wire jumpers. The S-(x) sensor lines must be
connected to M with wire jumpers.
ANA
You must also insert the same jumpers if only current outputs are
used. Unused current outputs may remain open.
The maximum load for the current outputs including line resistance,
must not exceed 300 ohms.
The voltage outputs of the 470 analog output module are wired as
follows:
QV 1 QV 2
S + 1
S + 2
+
-
S - 1
S - 2
The S+(x) and S-(x) sensor lines must be routed to the load (four-wire
circuit) if the voltage drop on the lines to the load is not negligible.
The common connection for the voltage outputs is M
voltage drop on lines to the load is negligible, you can connect S+(x)
to QV(x) and S-(x) to M
ANA
When voltage outputs are unused, you must insert jumpers in the front
connector, e.g. QV(3) to S+(3) and S-(3) to M
output 3 (see previous section).
The 470 Analog Output Module
QV 3
Jumper
S + 3
+
-
S - 3
Jumper
M
ANA
No Load
at QV 3
. If the
ANA
in the front connector.
for unused voltage
ANA
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