AKF_FL: Detection of any edge

Function description

The derived function block detects any edge (1 -> 0 and 0 -> 1) on the CLK input.

Output Q is "1" for a cycle if there is a transition from "0" to "1" or a transition from "1" to "0" on CLK; otherwise it remains "0".

and can be configured as additional parameters.

Representation in FBD

Representation:

Representation in LD

Representation:

Representation in IL

Representation:

CAL AKF_FL_Instance (CLK:=ClockInput, Q=>DisplaysAnyEdge)

Representation in ST

Representation:

AKF_FL_Instance (CLK:=ClockInput, Q=>DisplaysAnyEdge) ;

Parameter description

Description of the input parameters:

Parameters	Data type	Meaning
CLK	BOOL	Timing input

Description of the output parameters:

Parameters	Data type	Meaning
Q	BOOL	Display of any edge

EN stands for ENable; it is an optional block input. When the EN input is enabled, an ENO output is set automatically.

If EN = 0, the block is not enabled; its internal program is not executed, and ENO is set to 0.

If EN = 1, the block's internal program is run and ENO is set to 1. If an error occurs, ENO is set to 0.

If the EN input is not connected, it is set automatically to 1.

ENO

ENO stands for Error NOtification; this is the output associated with the optional input EN.

If ENO is set to 0 (because EN = 0 or in case of an execution error):

the status of the function block outputs remains the same as it was during the previous scanning cycle that executed correctly;
the output(s) of the function, as well as the procedures, are set to "0".

BOOL

BOOL is the abbreviation for the Boolean type. This is the basic data type in computing. A BOOL variable can have either of the following two values: 0 (FALSE) or 1 (TRUE).

A bit extracted from a word is of type BOOL, for example: %MW10.4.