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The parameters of the function
PID
:
•
Setpoint
•
Process
•
Output value
•
Type of regulation action
The PID function, after acquiring setpoint, process, type of action
and type of output, will set in the variable “Ouput value” the value
obtained in the algorithm of regulation. Such a value will be
obtained rescaling the percentage of the value between 0 and
10000 (0.00%
÷
100.00%) between the minimum and maximum
value of the PID output set by the RANGE function.
The following table indicates 8 types of regulation and the
modulation intervals (the effective value between the interval is
determined also by the actions integral and derivative, the table
shows only the proportional components):
Type of regulation action
Intervals of modulation
Single direct action, 0
Setpoint
Setpoint + P.B. / 2
Setpoint - P.B. / 2
Output 100%
Output 0%
Single direct action, 1
Setpoint
Setpoint + P.B. / 2
Setpoint - P.B. / 2
Output 100%
Output 0%
Single inverse action, 0
Setpoint
Setpoint + P.B./ 2
Setpoint - P.B. / 2
Output 100%
Output 0%
