
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
277
Formation of analog values
Measuring principle Actual value conversion
Integration/conversion time/resolution (per channel) (Does not go into the response time)
Programmable
Yes
Noise suppression f1 in Hz
None / 400 / 60 / 50
Basic conversion time
52 µs
Resolution (including overshoot range)
14 / 14 / 14
Measured value smoothing Can be configured "none - strong"
Time constant of the input filter 15 µs
Basic execution time of the module, in ms (all
channels enabled)
0,420
Noise suppression, error limits
Noise suppression for f = nx (f1 ±1%), (f1 = interference frequency) n = 1, 2, ...
Filter 400 / 60 / 50 Hz configured
Common-mode interference (UCM < 11 Vpp)
> 80 dB
Series-mode interference (peak value of
disturbance < nominal input range)
> 40 dB
Crosstalk between inputs > 70 dB
Operational limit (across temperature range, relative to input range)
Voltage input
– ± 1 V
– ± 10 V
– 1 to 5 V
± 0,7 %
± 0,9 %
± 0,9 %
Current input
– ± 20 mA
– 4 to 20 mA
± 0,8 %
± 0,8 %
Resistance measurement
– 0 to 600 Ω;
± 1,0 %
Basic error limit (operational error limit at 25° C, relative to input range)
Voltage input
– ± 1 V
– ± 10 V
– 1 to 5 V
± 0,6 %
± 0,75 %
± 0,75 %
Current input
– ± 20 mA
– 4 to 20 mA
± 0,7 %
± 0,7 %
Resistance measurement
– 0 to 600 Ω;
± 0,7 %
Temperature error (relative to input range) ± 0.03 % K
Linearity error (relative to input range) ± 0.05 % K
Repetition accuracy (in transient state at 25° C,
relative to input range)
± 0,2 %
Comentarios a estos manuales