Mitsubishi Electric MELSEC iQ-R Series User Manual page 167

Auto tuning command
Use this signal to start the auto tuning for each channel. Turning OFF to ON 'CH1 Auto tuning command' (Y4) starts the auto
tuning and turns ON 'CH1 Auto tuning status' (X4). After the auto tuning is completed, 'CH1 Auto tuning status' (X4) turns
OFF.
Keep 'CH1 Auto tuning command' (Y4) ON during the auto tuning, and turn OFF the signal at the completion of the auto
tuning. If 'CH1 Auto tuning command' (Y4) is turned from ON to OFF during the auto tuning, the auto tuning will stop. When
the auto tuning has stopped, the PID constants in the buffer memory do not change.
• If 0 has been set for Proportional band (P) setting or Heating proportional band (Ph) setting, the auto tuning
cannot be executed. ( Page 43 Conditions in which the auto tuning cannot be executed)
• When 'Setting/operation mode command' (Y1) is turned from ON to OFF and the mode shifts to the setting
mode during the auto tuning, the auto tuning stops. After that, even though 'Setting/operation mode
command' (Y1) is turned ON and the mode shifts back to the operation mode, the auto tuning does not
restart. To restart the auto tuning, turn OFF this command, and turn it ON again.
For details on the auto tuning function, refer to the following:
Page 38 Auto Tuning Function
■Device No.
The following shows the device number of this output signal.
Signal name
Auto tuning command
Setting value backup command
Use this signal to write the data in the buffer memory to the non-volatile memory. Turning from OFF to ON this command
starts the data writing to the non-volatile memory.
For the buffer memory areas whose data is to be backed up, refer to the following:
Page 167 List of buffer memory addresses
■When the data writing to the non-volatile memory has been completed successfully
'Setting value backup completion flag' (X8) turns ON.
■When the data writing to the non-volatile memory has not been completed successfully
'Setting value backup failure flag' (XA) turns ON. When 'Setting value backup failure flag' (XA) has turned ON, turn from OFF
to ON this command again and write the data to the non-volatile memory.
■Timings when this command cannot be accepted
This command are not accepted at the following timings:
• 1: While PID constants are being written automatically after auto tuning
• 2: While PID constants are being read from the non-volatile memory
• 3: When a setting error has occurred
• 4: While a setting is being changed with 'Setting change command' (YB)
For 1 to 3 above, turn from OFF to ON this command again after each factor is cleared. For 4, the data writing to the non-
volatile memory will automatically start when the factor is cleared.
For details on the data writing to the non-volatile memory, refer to the following:
Page 123 Buffer Memory Data Backup Function
■Device No.
The following shows the device number of this output signal.
Signal name
Setting value backup command
CH1 CH2
Y4 Y5
CH1 to CH4
Y8
CH3 CH4
Y6 Y7
APPX
Appendix 2 I/O Signal
A
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