Siemens S5-135U/155U appendix UCM2

Analog Input/Output Modules

The channels have the following designations on the module:

Channel 0:	M0 +
	M0 ±
Channel 1:	M1 +
	M1 ±
:	:
Channel 7:	M7 +
	M7 ±

Channels are arranged in groups of four, for which you can set separate measuring ranges:

Channel group I: Channels 0 to 3

Channel group II: Channels 4 to 7

The following figure shows the connection of sensors to the module.

You must observe the following condition:

UE + UCM < 12 V

(i.e. the sum of the set voltage range and common-mode voltage must be less than 12 V; current measuring ranges correspond to a voltage of 2.5 V).

		Analog Input Module
		M+
+
UE2		M±
±
+		MUX
±		M+
UCM2	+
U E1
	±	M±
	+
U	±	0 Vext
CM1
		UISO
		0 V Bus

UE1/2: Input Voltage

U CM1/2: Common-Mode Voltage

UISO: Potential Difference

:Equipotential; this potential is established by the sensor reference potential (external reference potential)

Figure 9-31 Connecting Sensors to the 466 Analog Input Module (DifferentialMeasurement)

9-90	System Manual
	C79000-G8576-C199-06