Siemens SIMATIC - Page 356

Analog modules
6.7 Analog input module SM 331; AI 8 x 12 bit;(6ES7331-7KF02-0AB0)
S7-300 Module data
356 Manual, 06/2017, A5E00105505-AJ
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 6-15 Block diagram and wiring diagram
Measuring range module settings
Measuring range
Measuring range module
setting
150 Ω
300 Ω
600 Ω
A
Thermoresistor
(linear, 4-wire connection) (temperature
measurement)
RTD-4L
Pt 100 Klima
Ni 100 Klima
Pt 100 Standard
Ni 100 Standard
A
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
C
). The "1st" channel of the
group returns the measured value. The "
2nd" channel of the group is assigned the default
overflow value "7FFF
H
."
•
There is no compensation of the line resistance with a 2 and 3-wire connection.