Siemens S5-135U/155U appendix Connecting Loads to the 470 Analog Output Module, Voltage Outputs

Analog Input/Output Modules

9.7.8Connecting 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 MANA must not exceed 3 V.

QV(x)
S+(x)		+
		Load (Voltage)
S ± (x)		±
QI (x) I	+	Load (Current)

±

MANA

Figure 9-39 Connecting Loads

QV(x)	Voltage output, voltage on Channels 0 to 7
QI(x)	Current output, current on Channels 0 to 7
S+(x)	Sensor line (+) for Channels 0 to 7
S- (x)	Sensor line (-) for Channels 0 to 7
MANA	Ground terminal for the analog section

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

QV0	QV1	QV2	QV3		QV4
					Jumper	Jumper
S+0	S+1	S+2	S+3		S+4
+		+	+
±	S±1	±	±		S±4
S±0		S±2	S±3
QI0	QI1	QI2	QI3		QI4	_
+		+	+	+
±		±	±	±	Jumper	Jumper
MANA
			MANA		MANA
			Current		Not Current
			Output		and Not Voltage
			Only		Output

Figure 9-40 Connecting Loads

System Manual	9-109
C79000-G8576-C199-06