Siemens S7-400PLC Spezifikationen Seite 306

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Analog modules
5.23 Analog input module SM 431; AI 16 x 16 Bit (6ES7431-7QH00-0AB0)
S7-400 Automation System Module Data
306 Reference Manual, Edition 09/2009, A5E00850736-06
See also
Parameters of analog input modules (Page 217)
General information about diagnostic messages (Page 99)
5.23.3 Measuring methods and measuring ranges of SM 431; AI 16 x 16 Bit
Measuring methods
You can set the measuring method at the input channels:
Voltage measurement
Current measurement
Resistance measurement
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 to 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- 63 Selection of the measuring method for channel n and channel n+1 of the SM 431; AI 16 x 16 Bit
Measuring method channel n+1
Measuring method, channel
n
Deacti-
vated
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-conductor resistor x
3-conductor 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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