Analog modules
6.10 Analog input module SM 331; AI 8 x TC; (6ES7331-7PF11-0AB0)
S7-300 Automation System Module data
6-88 Manual, 08/2006, A5E00105505-04
Wiring: Thermocouple with external compensation
With this form of compensation, the temperature of the terminals at the reference junction is
established using a resistor thermometer Pt100 with a temperature range of -25 °C to 85 °C
(see terminals 35 to 38).
/ದ
'&
'&
0
0
/
&+
&+
&+
&+
&+
&+
&+
&+
37
0
0
0
0
0
0
0
0
0
0
,
,
Figure 6-27 Wiring and block diagrams
① Thermocouple with external temperature compensation
② Backplane bus interface
③ Analog-to-Digital Converter (ADC)
④ External cold spot comparison
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