AdCtrlPidt1 (FB)

FUNCTION_BLOCK AdCtrlPidt1

The Pid controller changes its output Y (control variable) until input X (controlled variable) is equal to input W (command variable). The block is used AdCtrlCascade function Block. It does the basic Pid control including

• Anti wind-up for integrating part

• Limitation for Cv

• Bumpless setting of Cv to InitCV

• First order filter for derivative part

All times are scaled to cycles, block requires to be called in a cyclic PLC task

Additional pre-Filter for DT1-Component available is also available within the block

InOut:

Scope	Name	Type	Initial	Comment
Input	Sp	REAL	0	1: Command variable (set point)
	Pv	REAL	0	2: ProcessValue, Actual Value
	Kp	REAL	0	3: Proportional coefficient, specified as a percentage value (100% =1).
	TiCycles	REAL	0	4: Integral action time scaled to the PLC cycle time
	TdCycles	REAL	0	5: Derivative action time scaled to the PLC cycle time
	T1Cycles	REAL	0	6: Returning time scaled to the PLC cycle time (Filter Time).
	MaxCv	REAL	0	7: High limit for the control variable Cv
	MinCv	REAL	0	8: Low limit for the control variable Cv
	Set	BOOL	FALSE	9: Enable for setting Cv to InitCV, COntroller is stpped otherwise
	InitCv	REAL	0	10:Initial value for the control variable Cv
	Reset	BOOL	FALSE	11:Reset of the control variable Cv to 0, controller is stopped.
Output	Cv	REAL	0	1: Output for the control variable Control Value
	StateMax	BOOL	FALSE	2: High limit has been reached
	StateMin	BOOL	FALSE	3: Low limit has been reached

Structure:

• AdCtrlPidt1.zActionAbgleich (ACT)
• AdCtrlPidt1.zActionDt1mAnteil (ACT)