Connecting Loads To The 470 Analog Output Module - Siemens S5-135U/155U System Manual

9.7.8

Connecting Loads to the 470 Analog Output Module

The voltage at the load is measured at a high resistance via the sensor lines
(S+/S-) of voltage output QV, so that voltage drops on the load lines do not
falsify the load voltages. Lines S+(x) and S-(x) should therefore be directly
connected to the load (four-wire circuit). The voltage drops on the lines from
QV(x) to the load and from the load to M
Figure 9-39
QV(x)
QI(x)
S+(x)
S- (x)
M
ANA
Connecting Loads When current and voltage outputs are used on the 470-4UA/-4UC... analog
to Current and output modules, connect the loads as follows:
Voltage Outputs
QV1
QV0
S+0 S+1
+
–
S–1
S–0
QI0 QI1
+
–
M
ANA
Figure 9-40 Connecting Loads
System Manual
C79000-G8576-C199-06
QV(x)
S+(x)
S – (x)
QI (x) I
M ANA
Connecting Loads
Voltage output, voltage on Channels 0 to 7
Current output, current on Channels 0 to 7
Sensor line (+) for Channels 0 to 7
Sensor line (-) for Channels 0 to 7
Ground terminal for the analog section
QV2
S+2
+ +
– –
S–2
QI2
+ +
– –
Analog Input/Output Modules
must not exceed 3 V.
ANA
+
Load (Voltage)
–
+
Load (Current)
–
QV3 QV4
Jumper
S+3 S+4
S–3 S–4
_
QI3 QI4
+
–
Jumper
M M
ANA ANA
Current Not Current
Output and Not Voltage
Only Output
Jumper
Jumper
9-109