Siemens S5-155U System Manual page 463

The 466 Analog Input Module
9.6.7
Connecting Sensors to the
466 Analog Input Module
Measurement with respect
to ground
9 - 92
The connections for the 466 analog input module depend on the type
of measurement (with respect to ground or differential measurement).
For measurement with respect to ground, all signal lines have a
common reference point. This is achieved by connecting all the
M inputs in use to one point. Since this type of measurement is
susceptible to interference, the signal sources should be arranged in
the vicinity of the 466 analog input module.
16 channels are available; unused channels must be shorted (jumper
between M+ and M-).
The channels have the following designations on the module:
Channel 0: M0+
M0-
Channel 1: M1+
M1-
: :
Channel 15: M15+
M15-
Channels are arranged in groups of four, for which you can set
separate measuring ranges:
Channel group I: Channels 0 to 3
Channel group II: Channels 4 to 7
Channel group III: Channels 8 to 11
Channel group IV: Channels 12 to 15
System Manual
C79000-B8576-C109-03