Siemens SIMATIC CPU 410 System Manual page 425

The diagram below shows the connection of a 2-wire transmitter to two redundant SM 331;
AI 8 x 0/4...20mA HART.
Figure C-33 Interconnection example 2 SM 331; AI 8 x 0/4...20mA HART
CPU 410 Process Automation/CPU 410 SMART
System Manual, 05/2017, A5E31622160-AC
Connection examples for redundant I/Os
C.34 SM331; AI 8 x 0/4...20mA HART, 6ES7 331-7TF01-0AB0
425