Button4

Button4 (FB)

FUNCTION_BLOCK Button4

Short description

Switching element with four control inputs and four switching outputs. Additionally, an overall output is available.

Representation

Interfaces

Inputs

Name	Data type	Value range	Initial value	Function
xButton1	BOOL			Input control button 1
xButton2	BOOL			Input control button 2
xButton3	BOOL			Input control button 3
xButton4	BOOL			Input control button 4
xButtonOff	BOOL			Input central deactivation of all outputs

Outputs

Name	Data type	Value range	Initial value	Function
xQ1	BOOL			Switching output 1
xQ2	BOOL			Switching output 2
xQ3	BOOL			Switching output 3
xQ4	BOOL			Switching output 4
xQ	BOOL			Overall output

Setpoints / parameters

Name	Data type	Value range	Initial value	Function
xButton1Visu	BOOL		FALSE	Function like xButton1
xButton2Visu	BOOL		FALSE	Function like xButton2
xButton3Visu	BOOL		FALSE	Function like xButton3
xButton4Visu	BOOL		FALSE	Function like xButton4
xButtonOffVisu	BOOL		FALSE	Function like xButtonOff

Function description

General

The five inputs for the control buttons and the five visual buttons are continuously monitored for rising edges (= button pressed). The switching outputs and the overall output are set depending on which input a rising edge was detected on. The input xButton1 has the highest priority, the input xButton2 the second highest priority, etc. If no rising edge is detected on any of the four inputs, the states of the outputs do not change.

Overall output xQ

The overall output is activated (xQ = TRUE) if at least one of the four switching outputs is active. It is not active (xQ = FALSE) if none of the four switching outputs is active.

xButton1	xButton2	xButton3	xButton4	xQ1	xQ2	xQ3	xQ4	Note
L/H	X	X	X	TRUE	FALSE	FALSE	FALSE	Actuation - Button 1
FALSE, TRUE, H/L	L/H	X	X	FALSE	TRUE	FALSE	FALSE	Actuation - Button 2
FALSE, TRUE, H/L	FALSE, TRUE, H/L	L/H	X	FALSE	FALSE	TRUE	FALSE	Actuation - Button 3
FALSE, TRUE, H/L	FALSE, TRUE, H/L	FALSE, TRUE, H/L	L/H	FALSE	FALSE	FALSE	TRUE	Actuation - Button 4

Legend: X … not relevant, L/H … rising edge, H/L … falling edge

Central deactivation of all outputs xButtonOff or xButtonOffVisu

The outputs xQ1 to xQ4 are deactivated (= FALSE) if a rising edge is detected at input xButtonOff or at setpoint / parameter xButtonOffVisu (regardless of the current states at the control inputs) xButton1 to xButton4).

CODESYS

InOut:

Scope	Name	Type	Initial
Input	xButton1	BOOL
Input	xButton2	BOOL
Input	xButton3	BOOL
Input	xButton4	BOOL
Input	xButtonOff	BOOL
Input Const	xButtonOffVisu	BOOL	FALSE
Input Const	xButton4Visu	BOOL	FALSE
Input Const	xButton3Visu	BOOL	FALSE
Input Const	xButton2Visu	BOOL	FALSE
Input Const	xButton1Visu	BOOL	FALSE
Output	xQ1	BOOL
Output	xQ2	BOOL
Output	xQ3	BOOL
Output	xQ4	BOOL
Output	xQ	BOOL