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10.21 StartPID, PID and SetOutPID functions
The functions StartPID, PID and SetOutPID allow the regulation of
a size through an algorithm of action that is proportional, integral,
and derived.
The function StartPID activates the regulation. The function can
be activated a single time at startup or repeated at a later moment
permitting the modification “on the fly” of the parameters of
regulation. The integral action of the PID is zeroed only by calling
the functions and fixing the integral time to “0”. Otherwise, even in
case of shutdown, the system will initialize the regulation
maintaining as point of departure the same percentage of integral
action, thus limiting the time of transition.
Parameters of the function StartPID:
•
Proportional band
•
Integral time
•
Derived time
•
Dead band
The parameters can be inserted in numerical format, or can refer
to areas of memory. The integral time is expressed in the units of
time in which the function PID is called (for instance, function PID
called every 1 second, integral time expressed in seconds). The
derived time, however, is expressed with an additional decimal
digit with respect to the integral time. The proportional band and
the dead band are instead expressed in numeric values equal to
the setpoint and the process to regulate.
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 83
Summary of Contents for TD240 series
Page 1: ...Manuale operatore...
Page 2: ...2...
Page 6: ...6 3 Mechanical dimensions and installation...
Page 24: ...24 7 1 Starter Kit Connection of the terminal to the PC...
Page 27: ...27 7 2 1 Creation of a new project...
Page 89: ...89 11 Notes Updates...
Page 90: ...90...
Page 91: ...91...