Siemens SIMATIC Manual page 437

Options
Now you can:
● Start user calibration for the selected channel
-> "User calibration" button
● Reset the calibration values set at the factory for the selected channel
-> "Reset to factory setting" button
● Cancel the calibration function
-> "Cancel" button
Note
If you reset the currently active channel to its factory settings, the original calibration
values saved on the module when it was delivered become valid again. Any user-
calibration values which may exist for this channel are then lost. You cannot restore these
user-calibration values.
User calibration
User calibration is started for the selected channel by pressing the "User calibration" button.
A 24 V load voltage must be applied at the module for calibration.
The user calibration function re-establishes the calibration values required by the selected
channel in accordance with the measuring range which has been programmed for that
channel.
Calibration can be executed in the CPU's RUN or STOP operating modes. Please note that
in the CPU's RUN operating mode, the module does not return any correct analog values to
the process for the duration of the calibration.
Note
While user calibration is ongoing, none of the module channels can handle new process
values.
• All analog input values of the module are set to 0x7FFF ("invalid analog value") until
calibration is complete.
• All channels indicate this status by means of a corresponding channel-diagnostic function
using the second type of diagnosis (see Section 1.7, "Diagnostics of the analog input
module SM 331; AI 6 x TC isolated").
The previously selected channel is calibrated using the calibration display which is output.
S7-300 Module data
Manual, 06/2017, A5E00105505-AJ
6.11 Analog input module SM 331, AI 6 x TC isolated (6ES7331-7PE10-0AB0)
Analog modules
437