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Determining PID Constants: Autotuning and Manual Setup Section 3-7
3-7 Determining PID Constants: Autotuning and Manual Setup
3-7-1 Autotuning
• When executing autotuning, the optimum PID constants for the SP during
program execution are automatically set by changing the manipulated
variable (MV) to calculate the characteristics of the control target. This is
called the limit cycle method.
• Autotuning cannot be executed while stopped or during manual mode or
ON/OFF control.
• To start autotuning, use host communications operation commands or the
E5ZN-SDL Setting Display Unit and set “AT execute/stop” to “execute.”
• To stop autotuning, use host communications operation commands or the
E5ZN-SDL Setting Display Unit and set “AT execute/stop” to “stop.”
• During execution of autotuning, only “communications writing,” “RUN/
STOP,” “AT execute/stop,” and “auto/manual” parameters can be
changed. No other settings can be changed.
• If “RUN/STOP” is set to “STOP” during execution of autotuning, autotun-
ing and operation will stop. Autotuning will not start again even if “RUN/
STOP” is set to “RUN” again.
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