AKF_TE: Switch-on delay

Function description

The derived function block is used as switch on 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, 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 "1".

With a 0 -> 1 edge at the R input or a 1 -> 0 edge at the IN 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_TE_Instance (IN:=StartingDelay, ZB:=TimeBase,
    SW:=FactorDelayTime, R:=ResetInput, Q=>Output,
    TIW=>InternalTime, TSW=>TimerSetpointValue)

Representation in ST

Representation:

AKF_TE_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 for activation delay TE:

(1)

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

(2)

If the internal timer (TIW) reaches the value of TSW, Q becomes "1".

(3)

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

(4)

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

(5)

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

(6)

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

(7)

If IN becomes "1" and R is "1", the internal timer is not started.

Runtime error

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