Siemens SIMATIC Manual page 370

Analog modules
6.8 Analog input module SM 331; AI 2 x 12 Bit; (6ES7331-7KB02-0AB0)
Wiring: 2-, 3- and 4-wire connection of resistance transducers or thermoresistors
①
4-wire connection
②
3-wire connection, no compensation for line resistors
③
2-wire connection, no compensation for line resistors
Figure 6-19 Wiring and block diagram
Measuring range module settings
RTD-4L: Thermal resistance
(linear, 4-wire connection) (temperature
measurement)
Note
"Resistance measurement" is only available at one channel per group. The "2nd" channel of
the group is used accordingly for current measuring mode (I
The "1st" returns the measured value. The "2nd" channel of the group is assigned the default
overflow value "7FFF
370
Measuring range
150 Ω
300 Ω
600 Ω
Pt 100 Klima
Ni 100 Klima
Pt 100 Standard
Ni 100 Standard
."
H
Measuring range module setting
A
A
).
C
S7-300 Module data
Manual, 06/2017, A5E00105505-AJ