Siemens SIMATIC ET 200SP Manual page 15

Note
A connection between the current inputs I
leads to malfunctions of the module.
Analog input module AI 2xU/I 2-/4-wire HF (6ES7134-6HB00-0CA1)
Equipment Manual, 05/21, A5E51055079-AA
4.1 Wiring and block diagram
and the reference ground M
n
Wiring
is not allowed and
n
17