Analog input module SM 331; AI 6 x TC Isolated (6ES7331‑7PE10‑0AB0)
A5E02398493-02, 11/2008
13
Example
The figure below shows the number of cycles a module requires to apply a close to 100% analog value after a step
response, based on the smoothing function settings. The figure applies to all signal changes at the analog input.
6WHSUHVSRQVHIRUDQ\DQDORJLQSXWVLJQDO6LJQDOYDULDWLRQLQ
SHUFHQW
6PRRWKLQJ
/RZ
KLJK
DYHUDJH
0RGXOHF\FOHV
Figure Example of the influence of smoothing on step response
Reference cold junction compensation
When the measuring point is subjected to a temperature different from that of the free ends of the thermocouple (point of
connection), a voltage, the thermo-emf, occurs at the free ends.
The magnitude of the thermo-emf generated depends on the difference between the temperature at the measuring junction
and the temperature at the free ends, as well as the material combination used for the thermocouple. Since a thermocouple
always measures a temperature difference, the free ends must be kept at a known temperature at the reference junction in
order to determine the temperature of the measuring junction.
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