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Siemens Simatic S7-400 User Manual

Page 333

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Analog Modules

5-117

S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07

5.22.2

Measuring Methods and Measuring Ranges of the SM 431;
AI 16

16 Bit

Measuring Methods

You can set the following measuring methods for the input channels:

Voltage measurement

Current measurement

Resistance test

Temperature measurement

You specify the setting by means of the measuring range modules on the module
and the “Measuring Type” parameter in STEP 7.

Circuit Variants for the Channels

Two channels are set in each case with the measuring range module. There are
therefore restrictions as regards the measuring method for the adjacent channels
0/1, 2/3, 4/5, 6/7, 8/9, 10/11, 12/13 and 14/15, as shown in the following table:

Table 5-66 Selection of the Measuring Method for Channel n and Channel n+1 of the SM 431;

AI 16

16 Bit

Meas. Type
Channel n+1

Meas. Type
Channel n

Disabled

Voltage

Current

4-DMU

Current

2-DMU

R-4L

R-3L

RTD-4L RTD-3L TC-L

Disabled

x

x

x

x

x

Voltage

x

x

x

Current four-wire
transmitter

x

x

Current two-wire
transmitter

x

x

Resistance
four-conductor

x

Resistance
three-conductor

x

Thermal resistor
four-conductor

x

Thermal resistor
three-conductor

x

Thermocouples

x

x

x

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