MLFB_PlsPosFwBw

 Function Block A function block groups an algorithm and a set of private data. It has inputs and outputs. - Forward/backward position range indicator.

Inputs

Input	Data Type	Range	Unit	Default	Description
ibExecute	BOOL				Enable PLS.
iAnyModuloBlkID	DINT				Any modulo pipe network block ID.
iStartPos	LREAL				Start position of PLS.
iEndPos	LREAL				End position of PLS.
iDelayTime	TIME				Delay time for compensation.
iHysteresis	LREAL				Hysteresis.
ibForce	BOOL				Force PLS.

Outputs

Output	Data Type	Range	Unit	Description
oPLS	BOOL		N/A	Position limit switch.

Remarks

• Used in the command or actual position path, e.g., sampler pipe with noisy position, in both directions.
• Any modulo pipe block is needed, which can also be used for another instance of this UDFB "User Defined Function Block" UDFB can be used as a sub-function block in another program of the application. It is described using FBD, LD, ST or IL language. Input / output parameters of a UDFB (as well as private variables) are declared in the variable editor as local variables of the UDFB.
• It is also possible to define a hysteresis for switching on and off of the PLS.
• The Boolean output oPLS is set to:
  • TRUE if the position has crossed the start position.
  • FALSE if the position has crossed the end position.
• The function block is executed cyclically.
  • The modulo position is considered.
• The function block has the possibility to compensate a delay time of the connected device (e.g., glue nozzles).

Timing

Hysteresis

FBD Language Example

FFLD Language Example

IL Language Example

Not available.

ST Language Example

//PLSOutput is True when chosen comparator is between 180 and 270 with a T#2ms delay

//Can also force the output to be true with ForceOuput variable

//Hysteresis is on for 3 user units in case direction changes around start point
Inst_MLFB_PlsPosFwBw( EnablePLS, PipeNetwork.COMPARATOR, 180, 270, T#2ms, 3, ForceOutput );
PLSOutput := Inst_MLFB_PlsPosFwBW.oPLS;