
Analog modules
5.25 Analog input module SM 431; AI 8 x 16 Bit (6ES7431-7KF00-0AB0)
S7-400 Automation System Module Data
322 Reference Manual, Edition 09/2009, A5E00850736-06
Block diagram of the SM 431; AI 8 x 16 Bit
M0+
M0+
R0
M0-
CH1
CH2
CH3
CH4
CH5
CH6
CH7
CH0
A/Dconverter
Internal
supply
Backplane
bus interface
Bus S7-400
Figure 5-39 Block diagram of the SM 431; AI 8 x 16 Bit
Note
An external protective network is required in the signal lines in accordance with IEC 61000-
4-5 (12 V lightning protection device, model CT919-506, switched in parallel with all inputs
according to the manufacturer's recommendations).
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