Siemens S7-400PLC Spécifications Page 281

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Analog modules
5.21 Analog input module SM 431; AI 8 x 14 Bit (6ES7431-1KF20-0AB0)
S7-400 Automation System Module Data
Reference Manual, Edition 09/2009, A5E00850736-06
281
See also
General information about parameter assignment (Page 216)
Measuring methods and measuring ranges of SM 431; AI 8 x 14 Bit (Page 281)
5.21.3 Measuring methods and measuring ranges of SM 431; AI 8 x 14 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 the measuring method for the adjacent channels 0/1, 2/3, 4/5 and 6/7,
as shown in the following table:
Table 5- 55 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-conductor resistor x
3-conductor resistor x
4-conductor thermal
resistor
x
3-conductor thermal
resistor
x
Thermocouples x x x
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