Siemens S7-400PLC Spezifikationen Seite 270

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Analog modules
5.20 Analog input module SM 431; AI 8 x 14 Bit (6ES7431-1KF10-0AB0)
S7-400 Automation System Module Data
270 Reference Manual, Edition 09/2009, A5E00850736-06
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 and 6/7,
as shown in the following table:
Table 5- 49 Selection of the measuring method for channel n and channel n+1 of the SM 431; AI 8 x 14 Bit (6ES7431-
1KF10-0AB0)
Measuring method,
channel n
Measuring method, channel n + 1
Deactiv
ated
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 4-wire
transducer
x x
Current 2-wire
transducer
x x
4-wire
resistor
x
3-wire
resistor
x
Four-wire thermal
resistor
x
3-wire thermal
resistor
x
Thermocouples x x x
Example
If you select "current (2-wire transducer)" for channel 6, you can only disable the measuring
method or set "current (2-wire transducer)" for channel 7.
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