
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
312 Reference Manual, Edition 09/2009, A5E00850736-06
Block diagram of the SM 431; AI 8 x RTD x 16 Bit
SO+0
SE+0
SE-0
GND
SO+7
SE+7
SE-7
AGND
CH0
CH1
CH2
CH3
CH4
CH5
CH6
CH7
Electrical
isolation
A/Dconverter
Backplane
bus
interface
Internal
power supply
Bus S7-400
Figure 5-36 Block diagram of the SM 431; AI 8 x RTD 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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