The Temperature Control package in AC500 V3 library uses a state machine to accomplish all work , including:
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Automatic PID control (state PID_Process): Normal operation
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Auto tuning procedure (state AutoTune): Can be used during the commissioning phase to calculate the optimized parameters for PID controller.
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Manual Control (state Manual): Open loop control with directly change of duty cycle.
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Alarm handling
The figure below explains the statemachine of temperature control for one temperature zone.
Fig. 345: Control Principle of State machine
