Analog input module SM 331; AI 6 x TC Isolated (6ES7331‑7PE10‑0AB0)
A5E02398493-02, 11/2008
5
Wiring: Thermocouple via reference junction
With this type of compensation the temperature of the terminals at the reference junction is regulated to 0° C or 50° C.
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① Thermocouple via reference junction wiring to front connector with copper wire
② Backplane bus interface
③ Analog-to-Digital Converter (ADC)
④ External cold junction comparison (ADC and current source)
⑤ Reference junction regulated to 0 °C or 50 °C for example, compensation box (per channel) or thermostat
Figure Reference Junction
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