Measuring Methods And Measuring Ranges Of Sm 431; Ai 16 X 16 Bit - Siemens SIMATIC S7-400 Reference Manual

Analog modules
5.23 Analog input module SM 431; AI 16 x 16 Bit (6ES7431-7QH00-0AB0)
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
Disabled
Voltage
Current 4-wire transducer
Current 2-wire transducer
4-conductor resistor
3-conductor resistor
Four-wire thermal resistor
3-wire thermal
resistor
Thermocouples
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.
288
Measuring method channel n+1
deacti‐ Voltage Current
vated 4-DMU
x x x
x x
x x
x
x
x
x
x
x x
Current R-4L R-3L
2-DMU
x
x
Reference Manual, Ausgabe 11/2016, A5E00850736-08
RTD-4L RTD-3L
S7-400 Automation System Module Data
TC-L
x
x
x