HaModPidFixCycle (FB)

FUNCTION_BLOCK HaModPidFixCycle

Function block HaModPidFixCycle is a standard PID in fixcycle with automatic data synchronization in a high availability system Only internal variables and outputs are synchronized. Input variables and parameters are not synchronized. If needed, use HaModDataSync to achieve the same.

Note

Input Kp must not be equal to 0, Input Tn must be greater than 0, Input Cycle must be greater than 0

Note

Input Reset and Manual must be set to FALSE at the start of the program

Note

It is not recommended to call utility blocks inside other function blocks in user application, this can impact the data synchronization between PLCs. For example, if HaModTon function block is used inside user’s function block, it will lead to data sync mismatch.

InOut:

Scope	Name	Type	Initial	Comment
Input	Actual	REAL	0	1:Actual value, process variable
	SetPoint	REAL	0	2:Desired value, set point
	Kp	REAL	0.05	3:Proportionality coefficient , unity gain of the P-part (P)
	Tn	REAL	10000	4:Reset time (I) in sec
	Tv	REAL	0	5:Rate time, derivative time (D) in sec
	YManual	REAL	0	6:Y is set to this value as long as Manual = TRUE
	YOffset	REAL	0	7:Offset for manipulated variable
	YMin	REAL	0	8:Minimum value for manipulated variable
	YMax	REAL	0	9:Maximum value for manipulated variable
	Manual	BOOL	FALSE	10:TRUE: manual: Y is not influenced by controller, FALSE: controller determines Y
	Reset	BOOL	FALSE	11:Reset: set Y output to YOffset and reset integral part
	Cycle	REAL	1	12:Time in second between two calls
Output	Y	REAL	0	1:Manipulated variable, set value
	LimitsActive	BOOL	FALSE	2:True set value would exceed limits YMin, YMax
	Overflow	BOOL	FALSE	3:Overflow in integral part