Siemens Simatic S7-400 - Page 296

Technical specifications for SM 431; AI 8 x RTD x 16 bit
Dimensions and weight
Dimensions W x H x D (in mm) 25 x 290 x 210
Weight ca. 650 g
Module-specific data
Number of inputs 8
Cable length
● Shielded
Maximum 200 m
Voltage, current and potential
Constant current for resistance-based sensor Typ. 1 mA
Electrical isolation
● Between channels and backplane bus
● Between channels
Yes
No
Permissible potential difference
Between M
ANA
and M
intern
(U
ISO
) 60 V DC/30 V AC (SELV)
Insulation tested at 1500 V DC
Current consumption
● From backplane bus (5 V)
Maximum 650 mA
Module power loss Typ. 3.3 W
Formation of analog values
Measuring principle Integrating
Integration time/conversion time/resolution
● Configurable
Yes
● Basic conversion time
(all channels enabled)
8 ms/23 ms/25 ms
Additional conversion time / repeat rate
● Wire-break monitoring
110 ms/4 s
● 3-wire compensation
110 ms/390 s
● Internal self-calibration
No interference frequency suppression
50/60 Hz
50 ms/110 s
● Resolution, including sign
210 ms/390 s
16 bits
● Interference voltage suppression for interference
frequency f1 in Hz
None/50/60
Measured value smoothing Parameters can be assigned in 4 stages
Basic response time of the module (all channels ena‐
bled)
8 ms/23 ms/25 ms
Noise suppression, error limits
Noise suppression for f = n (fl ± 1%), (f1 = interf. freq.) n = 1, 2, ...
● Common mode interference (Ucm < 120 V)
> 100 dB
● Series-mode interference (peak value of
interference < rated value of input range)
> 50 dB
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
296 Reference Manual, Ausgabe 11/2016, A5E00850736-08