TOHO ELECTRONICS TTM000 - Manual (Page 33)

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6.11.8 Storing data other than a store request message
This product will store all parameters in the EEPROM in either of the two cases described below,
even if no store request message is received.
1) If a parameter is changed by key operation
2) When the auto-tuning is activated and ends normally, only PID constant will be written.
6.11.9 Changing the settings (SV or SV2) by communications during auto-tuning
Even if the settings (SV or SV2) used in control for auto-tuning are changed by communications,
the settings (SV or SV2) will not be changed until the auto-tuning ends.