Description

Function description

This function enables a free-running counter, which can be used for run time measurement of sections and application programs.

EN and ENO can be configured as additional parameters.

Run time determination of a section

Determine the run time of a section:

Step	Action
1	Place one `FREERUN` function at the start of the section and one at the end.
2	Use the execution sequence to ensure that the `FREERUN` function at the start of the section is executed first and the one at the end of the section is executed last.
3	Calculate the delta of the two values obtained. Delta displays the run time of the section in microseconds.

Step

Action

Place one FREERUN function at the start of the section and one at the end.

Use the execution sequence to ensure that the FREERUN function at the start of the section is executed first and the one at the end of the section is executed last.

Calculate the delta of the two values obtained.

Delta displays the run time of the section in microseconds.

Run time determination of a program

Determine the run time of a program:

Step	Action
1	Place a `FREERUN` function at the start of the first section of the program and one at the end of the last section.
2	Use the execution sequence to ensure that the `FREERUN` function at the start of the first section is executed first and the one at the end of the section is executed last.
3	Calculate the delta of the two values obtained. This delta displays the run time of the program in microseconds.

Step

Action

Place a FREERUN function at the start of the first section of the program and one at the end of the last section.

Use the execution sequence to ensure that the FREERUN function at the start of the first section is executed first and the one at the end of the section is executed last.

Calculate the delta of the two values obtained.

This delta displays the run time of the program in microseconds.

Representation in FBD

Representation in LD

Representation in IL

Representation:

FREERUN
ST MeasuredTime

Representation in ST

Representation:

MeasuredTime := FREERUN () ;

Parameter description

Description of the output parameter:

Parameter	Data type	Meaning
`MeasuredTime`	`DINT`	Shows the time measured since the program started in microseconds.