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6-16
Chapter 6. OPERATION
• When auto-tuning is executed, control is stopped, and ON/OFF output
switching (if the output type is relay output or voltage output) or output
switching between the manipulated variable upper and lower limits of the
currently selected PID set (if the output type is current output or position-
proportional output) is repeated several times. If this causes controller
trouble, manually set the PID value.
• Sometimes a suitable PID value cannot be obtained depending on the
control target. If this happens, manually set the PID value.
• Though auto-tuning can be executed simultaneously on both the CH1
and CH2 channels, suitable PID values cannot be obtained if PVs in
each channel interfere with each. If this happens, execute auto-tuning on
each channel individually.