5.22.3 Measuring methods and measuring ranges of SM 431; AI 16 x 13 Bit
Measuring methods
You can set the measuring method at the input channels:
● Voltage measurement
● Current 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 5-59 Selection of the measuring method for channel n and channel n+1 of the SM 431; AI 16 x 13 Bit
Measuring method, chan‐
nel n
Measuring method, channel n + 1
Disabled Voltage
±1 V
Voltage 1 to 5
V
Voltage ±10 V Current 4-
DMU
Current 2-
DMU
Disabled x x x x x x
Voltage ±1 V x x
Voltage 1 to 5 V x x x
Voltage ±10 V x x x
Current 4-wire transducer x x
Current 2-wire transducer 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.
Unused channels
Unused channels can be left open. Set the measuring range modules to position "B". You can
improve the noise immunity of the module in a measuring environment with serious
interference by interconnecting M- and M
ANA
.
For unused channels, set the "measuring method" parameter to "deactivated". This reduces
the module's cycle time.
Analog modules
5.22 Analog input module SM 431; AI 16 x 13 Bit (6ES7431-0HH00-0AB0)
S7-400 Automation System Module Data
Reference Manual, Ausgabe 11/2016, A5E00850736-08 271
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