Siemens S5-135U/155U - Manual (Page 492)

9-110
System Manual
C79000-G8576-C199-06
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
ANA
with wire jumpers.
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:
+
–
QV0
S+0
S–0
+
–
+
–
M
ANA
No Load at QV3
Jumper
Jumper
QV1
S+1
S–1
QV2
S+2
S–2
QV3
S+3
S–3
M
ANA
Figure 9-41 Connecting Loads
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
ANA
. If the voltage drop on
lines to the load is negligible, you can connect S+(x) to QV(x) and S-(x) to
M
ANA
in the front connector.
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
ANA
for unused voltage output
3 (see previous section).
Connecting Loads
to Voltage Outputs
Four-Wire Circuit
Analog Input/Output Modules