Analog modules
6.6 Analog input module SM 331; AI 8 x 13 Bit; (6ES7331-1KF02-0AB0)
S7-300 Module data
Manual, 06/2017, A5E00105505-AJ
343
Wiring: Resistance measurement with 2-, 3- and 4-wire connection
The following connection possibilities also apply to silicon temperature sensors and PTCs.
2-wire connection. Insert a bridge between M and S (no line resistance compensation).
4-wire connection. The fourth line may not be wired (remains unused)
4-wire connection. The fourth line is routed to the terminal strip in the cabinet but is not wired.
Logic and backplane bus interface
Analog to Digital Converter (ADC)
Figure 6-12 Block diagram and terminal diagram
necessary to interconnect the M- terminals when measuring using resistors,
resistance thermometers, PTCs, or silicon temperature sensors. However, interconnection of
the M
- terminals may enhance interference immunity.
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