AKF_ZV: Incremental counter

Function description

The derived function block is used for incrementing.

With a "1"signal at the R input, the actual value and the Q output are set to"0".

With a 0 -> 1 edge at the S input, the SW input accepts the setpoint value which is then displayed at the ZSWO output. The actual value is set to "0". A comparison of setpoint value/actual value will not take place until a setpoint value has been accepted at least once.

The Q output is set to "1" if the actual value is greater than "0" and less than the setpoint value.

In the case of -> 1 edge at the IN input, the actual value (ZIWO) is increased by 1 and compared to the setpoint value (ZSWO).

The ZIW and ZSW inputs can be used to change the setpoint value (ZSW) and the actual value (ZIW) online.

NOTE: In order for the counter to work correctly, the variable (actual value) which is established at ZIW must also be established at ZIWO. The variable (setpoint), which is established at ZSW has also to be established at ZSWO.

and can be configured as additional parameters.

Formula

Q = 1, if 0 < ZIWO < ZSWO

Representation in FBD

Representation:

Representation in LD

Representation:

Representation in IL

Representation:

CAL AKF_ZV_Instance (IN:=TriggerInput, S:=SetInput,
    SW:=PresetSetpointValue, R:=ResetInput,
    ZIW:=InternalCurrentValueControl,
    ZSW:=InternalSetpointValueControl, Q=>Output,
    ZIWO=>DisplayCurrentValue, ZSWO=>DisplaySetpointValue)

Representation in ST

Representation:

AKF_ZV_Instance (IN:=TriggerInput, S:=SetInput,
    SW:=PresetSetpointValue, R:=ResetInput,
    ZIW:=InternalCurrentValueControl,
    ZSW:=InternalSetpointValueControl, Q=>Output,
    ZIWO=>DisplayCurrentValue, ZSWO=>DisplaySetpointValue) ;

Parameter description

Description of input parameters:

Parameter	Data type	Description
IN	BOOL	Trigger input
S	BOOL	Set input
SW	INT	Preset setpoint value
R	BOOL	Reset input
ZIW	INT	Control of the internal actual value
ZSW	INT	Control of internal setpoint value

Description of output parameters:

Parameter	Data type	Description
Q	BOOL	Output
ZIWO	INT	Count value (display of actual value)
ZSWO	INT	Display of setpoint value

NOTE: the same variable should be assigned to the pin ZIW and ZIWO and the same variable should be assigned to the Pin ZSW and ZSWO also, or the function block can't execute normally.

Timing diagram

Timing diagram for Incremental counter AKF_ZVR:

(1)

If IN becomes "1" and R is "0", the actual value is increased by "1" and Q is set to "1".

(2)

If R becomes "1", the actual value and Q are set to "0".

(3)

If S becomes "1", the preset setpoint value is accepted.

(4)

If IN becomes "1", the actual value is increased by "1". If this causes the actual value to reach the setpoint value, Q is set to "0".

(5)

If IN becomes "1", the actual value is increased by "1".

(6)

If S becomes "1", the preset setpoint value is accepted and the actual value is set to "0".

(7)

If S becomes "1", the preset setpoint value is accepted, and the actual value and Q are set to "0".