Siemens Simatic S7-400 - Manual (Page 324)

Analog Modules
5-108
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
Block Diagram of the SM 431; AI 16 16 Bit
Bus S7-400
Bus control
A
D
CH0
CH1
+ 15 V
+ 5 V
0 V
–15 V
+ 5 V
0 V
I
const
Diagnostics
in
L+ loop
L +
M
PGA
Multiplexer Opto relay
CH14
CH15
Meas. range
Meas. range
module 0
module 7
Signal jumpering
Bus S7-400
Figure 5-35 Block Diagram of the SM 431; AI 16 x 16 Bit