
Analog modules
5.24 Analog input module SM 431; AI 8 x RTD x 16 Bit (6ES7431-7KF10-0AB0)
S7-400 Automation System Module Data
314 Reference Manual, Edition 09/2009, A5E00850736-06
Specifications of the SM 431; AI 8 x RTD x 16 Bit
Dimensions and weight
Dimensions W x H x D (mm) 25 x 290 x 210
Weight Approx. 650 g
Module-specific data
Number of inputs 8
Length of cable
Shielded
Max. 200 m
Voltages, currents and potentials
Constant current for resistive transducers Typ. 1 mA
Electrical isolation
Between channels and the backplane bus
Yes
Permissible potential difference
Between M
ANA
and M
internal
(V
iso
) 120 VAC
Isolation test voltage 1500 VDC
Current consumption
From the backplane bus (5 V)
Max. 650 mA
Power loss of the module Typ. 3.3 W
Formation of analog values
Measuring principle Integrating
Integration/conversion time/resolution (per channel)
Programmable
Yes
Basic conversion time
(all channels enabled)
8 ms/23 ms/25 ms
Additional conversion time for measuring resistance, in ms
Wire break monitoring
110 ms/4 s
3-wire compensation
110 ms/390 s
Internal self-calibration
No noise suppression
50/60 Hz
50 ms/110 s
Resolution, including sign
210 ms/390 s
16 bits
Noise suppression at interference frequency f1 in
Hz
None/50/60
Measured value smoothing Parameters can be assigned to 4 levels
Basic response time of module (all channels enabled) 8 ms/23 ms/25 ms
Noise suppression, error limits
Noise suppression for f = n (f1 ± 1%), (f1 = interference frequency) n = 1, 2, ...
Common-mode noise (Ucm <120 V)
> 100 dB
Series mode interference (peak value of
disturbance < nominal input range)
> 50 dB
Crosstalk between inputs > 70 dB
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