Siemens SIMATIC - Additional Information on SM 334; AI 4; AO 2 X 12 Bit; Unused Channels; Always Short-Circuit Unused Input Channels, and Connect These to M; Interference Immunity of the Analog Input Module

Analog modules
6.17 Analog IO module SM 334; AI 4/AO 2 x 12 bit; (6ES7334-0KE00-0AB0)
S7-300 Module data
492 Manual, 06/2017, A5E00105505-AJ
6.17.3 Additional information on SM 334; AI 4/ AO 2 x 12 bit
Unused channels
Set the "disabled" value at the "measurement type" parameter for unused input channels.
This setting reduces module cycle times.
Always short-circuit unused input channels, and connect these to M
ANA
. This optimizes
interference immunity of the analog input module.
To take the unused output channels of SM 334; AI 4/AO 2 x 12 Bit off power, always set
"disabled" argument at the "output type" parameter, and leave the connection open.