Button4 (FB)¶

FUNCTION_BLOCK Button4

Functional Description¶

Switching element with four control inputs and four switching outputs.

A total output is also available.

Portrayal¶

Interfaces¶

Inputs¶

Name
Datatype

Range

Init-Value

Function

xButton1 BOOL
Input operating key 1

xButton2 BOOL
Input operating key 2

xButton3 BOOL
Input operating key 3

xButton4 BOOL
Input operating key 4

Outputs¶

Name
Datatype

Range

Init-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

Functional Description¶

General¶

The four input for the control keys is permanently monitored on rising edges (= Key operated).
The switching outputs and the overall output are set depending on the input at which
a rising edge was detected. The input xButton1 has the highest priority, the input xButton2 the second highest
priority and so on. If no rising edge is detected on one of the four inputs, then the outputs will
be unchanged.

Overall output xQ¶

The overall output is activated (xQ = TRUE) if one of the four switching outputs is active.

It’s not activated (xQ = FALSE) if no switching output is active

xButton1 xButton2 xButton3 xButton4 xQ1 xQ2 xQ3 xQ4
Notes

L/H X X X TRUE FALSE FALSE FALSE
Operate - Key 1

FALSE, TRUE, H/L L/H X X FALSE TRUE FALSE FALSE
Operate - Key 2

FALSE, TRUE, H/L FALSE, TRUE, H/L L/H X FALSE FALSE TRUE FALSE
Operate - Key 3

FALSE, TRUE, H/L FALSE, TRUE, H/L FALSE, TRUE, H/L L/H FALSE FALSE FALSE TRUE
Operate - Key 4

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

Visualization¶

Information¶

Element
Authors

Date
Version
Notes

Function
Adam Bartod 09.2016 1.0
Initial version

Programming
Adam Bartod 09.2016 1.0
Initial version

Test Jochen Reu 09.2017 1.0
Initial version

Documentation
Jochen Reu 10.2017 1.0
Initial version

Documentation
Lukas Pfänder 11.2017 0.1.3.0
Revision: Input xButtonOff is missing

Codesys¶

InOut:

Scope	Name	Type	Comment
Input	xButton1	BOOL	Input operating key 1
	xButton2	BOOL	Input operating key 2
	xButton3	BOOL	Input operating key 3
	xButton4	BOOL	Input operating key 4
	xButtonOff	BOOL	Input off
Output	xQ1	BOOL	Switching output 1
	xQ2	BOOL	Switching output 2
	xQ3	BOOL	Switching output 3
	xQ4	BOOL	Switching output 4
	xQ	BOOL	Overall output