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Soft element function comments:
HD2.7: Auto tune bit
HD2.8: Successful flag of auto tune
M0: Normal PID control
M1: Auto tune control
M2: Enter PID control after auto tune
Operation steps:
1. Send the actual temperature to PID collection register
2. Set probably value for P, I, D, sampling period
3. Set ON auto tune control bit M1 to startup PID auto tune
4. M1 will be reset after the auto tune is finished
5. Set ON M0, use the PID parameters getting from auto tune
6. If the PID effect is not good by using the auto tune PID parameters, user can adjust the PID
parameters to get good effect.
Note: This PLC temperature PID control program is applicable to almost all temperature
control projects.
Example 2:
To control the target temperature 60℃ in step response mode.
Overshoot is permitted:
1. The target temperature 60℃ (600)
2. Parameters setting
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