Siemens SIMATIC S7-300 Manual page 286

Analog modules
6.7 Analog input module SM 331; AI 8 x 12 Bit;(6ES7331-7KF02-0AB0)
Note
• "Resistance measurement" is only available at one channel per group. The "2nd" channel
• There is no performance resistors compensation with "2- and 3-wire connections".
Wiring: Thermocouples with external compensation
With internal compensation, there must be a bridge between Comp+ and M
Figure 6-17 Block diagram and wiring diagram
6-52
of the group is used accordingly for current impression (I
group returns the measured value. The "2nd" channel of the group has the default
overflow value "7FFF ."
H
). The "1st" channel of the
C
.
ANA
S7-300 Automation System Module data
Manual, 08/2006, A5E00105505-04