AKF_TV: Extended pulse

Function description

The derived function block is used to generate an extended pulse.

The pulse duration comprises a time base ZB and a factor SW. The pulse duration is calculated from ZB x SW.

The actual value is displayed at the TIW output and is calculated according to the following formula: TIW = expired time / ZB

With a 0 -> 1 edge at the IN input, the pulse duration is transferred to the TSW output, the internal timer is started and the Q output is set to "1".

The Q output remains at "1", independent of IN, until TIW equals TSW. The Q output is now set to "0".

With a 0 -> 1 edge at the R input the internal timer is reset and the Q output is set to "0".

and can be configured as additional parameters.

Representation in FBD

Representation:

Representation in LD

Representation:

Representation in IL

Representation:

CAL AKF_TV_Instance (IN:=StartingPulse, ZB:=TimeBaseOfPulse, 
    SW:=FactorOfPulse, R:=ResetInput, Q=>Output,
    TIW=>InternalTime, TSW=>TimerSetpointValue)

Representation in ST

Representation:

AKF_TV_Instance (IN:=StartingPulse, ZB:=TimeBaseOfPulse,
    SW:=FactorOfPulse, R:=ResetInput, Q=>Output,
    TIW=>InternalTime, TSW=>TimerSetpointValue) ;

Parameter description

Description of input parameters:

Parameter	Data type	Description
IN	BOOL	Start pulse
ZB	TIME	Time basis of the pulse
SW	INT	Pulse factor
R	BOOL	Reset input

Description of output parameters:

Parameter	Data type	Description
Q	BOOL	Output
TIW	INT	internal time (actual timer value)
TSW	INT	Timer setpoint at time of 0 -> 1 edge at IN

Timing diagram

Timing diagram for extended pulse TV:

(1)

If IN becomes "1", Q becomes "1", and the internal timer (TIW) is started.

(2)

If the internal timer (TIW) reaches the value of TSW, Q becomes "0".

(3)

If IN becomes "1" again, the internal timer is restarted and Q becomes "1".

(4)

If IN becomes "1" again, the internal timer is restarted and Q remains "1".

(5)

If R becomes "1", Q becomes "0", independent of IN, and the internal timer is stopped/reset.

(6)

If IN becomes "1" and R is "1", Q remains at "0" and the internal timer is not started.

Runtime error

For a list of all block error codes and values, see Extension/Compatibility.