Siemens S5-135U/155U appendix CH0

Analog Input/Output Modules

9.3.10Connecting Resistance Thermometers in the Standard Pt 100 Range

The series-connected resistance thermometers (up to 8 Pt 100s) are fed with a current of 2.5 mA (IC+/IC-) by a constant current generator. The voltage at the Pt 100's is picked off at measurement inputs M+ and M-. In this mode, the whole temperature range of the Pt 100 (-200 °C to +840 °C) is available. The mode is printed on the cover of the module as follows:

ªresistance thermometer uncompensated full range.º Other voltage sensors can be connected in a floating circuit at the M+/M- inputs of a card which are not assigned to resistance thermometers (voltage range 500 mV).

	+
						460 Analog Input Module
Pt 100	±				Card 1
				M +
			CH0	M±		A
					Range
Pt 100			CH1		Card for	MUX
					4 Inputs
					6ES5 498-
			CH2		-1AA11
						#
Pt 100
			CH3			D
		0...500 mV
					Card 2
	UCM		CH4
		0...500 mV
		UCM	2)		Range
					Card for
					4 Inputs
					6ES5 498-
					-1AA11
					1)
			CH7
Pt 100				IC±
						L +
				IC+		L ±
					const.
					2.5 mA
						0 V Bus

Figure 9-9 Connecting Resistance Thermometers in the Standard Pt 100 Range

1)If no Pt 100 is connected to CH4 to CH7, other voltages and currents can be measured at these channels with cards 6ES5 498-1AA21, 6ES5 498-1AA31, 6ES5 498-1AA41, 6ES5 498-1AA51, 6ES5 498-1AA61, 6ES5 498-1AA71.

2)When cards 6ES5 498-1AA41, 6ES5 498-1AA51 or 6ES5 498-1AA71 are used, a short-circuit jumper is not required.

9-20	System Manual
	C79000-G8576-C199-06