AKF_TA: Switch off delay

Function description

The derived function block is used as switch off delay.

The delay time comprises a time base ZB and a factor SW. The delay time 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 delay time is transferred to the TSW output and the Q output is set to "1".

With a 1 -> 0 at the IN input, the internal timer is started and the current state is displayed at the TIW output. When TIW equals TSW, the Q output is 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_TA_Instance (IN:=StartingDelay, ZB:=TimeBase,
    SW:=FactorDelayTime, R:=ResetInput, Q=>Output,
    TIW=>InternalTime, TSW=>TimerSetpointValue)

Representation in ST

Representation:

AKF_TA_Instance (IN:=StartingDelay, ZB:=TimeBase,
    SW:=FactorDelayTime, R:=ResetInput, Q=>Output,
    TIW=>InternalTime, TSW=>TimerSetpointValue) ;

Parameter description

Description of input parameters:

Parameter	Data type	Description
IN	BOOL	Start delay
ZB	TIME	Time basis of delay time
SW	INT	Delay time 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 of the TA disconnection delay:

(1)

If IN becomes "1", Q becomes "1".

(2)

If IN becomes "0", the internal timer (TIW) is started.

(3)

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

(4)

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

(5)

If IN becomes "1" before the internal Timer TIW has reached the value of TSW, the internal time is stopped/reset, without Q becoming "0".

(6)

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

(7)

If R becomes "1" and IN is "1", Q becomes "0".

(8)

If R becomes "0" and IN is "1", Q becomes "1".

(9)

If R becomes "1", the internal timer is stopped/reset.

(10)

If IN becomes "1" and R is "1", Q remains at "0".

Runtime error

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