Analog modules
6.3 Analog input module SM 331; AI 8 x 16 Bit; (6ES7331-7NF00-0AB0)
S7-300 Automation System Module data
6-16 Manual, 08/2006, A5E00105505-04
Limits may not be set higher than the minimum limits to be expected as shown in the table
below.
Table 6-8 Minimum high and low limits of SM 331; AI 8 x 16 Bit
Measuring range Minimum high limit Minimum low limit
± 10 V 11.368 V
31430
7AC6
H
-11.369 V
-31433
8537
H
± 5 V 5.684 V
31430
7AC6
H
-5.684 V
-31430
853A
H
1 to 5 V 5.684 V
32376
7E78
H
0.296 V
-4864
ED00
H
0 mA to 20 mA 22.737 mA
31432
7AC8
H
-3.519 mA
-4864
ED00
H
4 mA to 20 mA 22.737 mA
32378
7E7A
H
1.185 mA
-4864
ED00
H
± 20 mA 22.737 mA
31432
7AC8
H
-22.737 mA
-31432
8538
H
Measuring errors as a result of CMV
SM 331; AI 8 x 16 Bit is capable of taking measurements, irrespective of the presence of AC
or DC CMV.
With AC CMV values of a multiple of filter frequency settings, noise is suppressed as a result
of ADC integration time and common mode suppression at the input amplifiers. With AC
CMV < 35 V
rms
, the noise suppression of > 100 dB results in negligible measurement errors.
The influence of DC CMV can only be reduced to minimum using the noise suppression
function of the input amplifier unit. A certain degradation of measuring accuracy in proportion
to CMV must be expected. The worst case error is generated at 50 VDC between one
channel and the remaining seven channels. The calculated worst case error is 0.7% at 0 °C
to 60 °C, while the measured error usually lies at ≤ 0.1% at 25 °C.
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