ChangeStateUpDown

ChangeStateUpDown (FB)

FUNCTION_BLOCK ChangeStateUpDown

Short description

Switching between freely definable states (UP and DOWN button) Prerequisite: Connection of a suitable array at input 'arStates' with elements of type 'stChangeStateUpDwon' Typical application: Switching of operating modes\

Representation

Interfaces

Inputs

Name	Data type	Value range	Initial value	Function
xStateUp	BOOL		FALSE	Switch to the next higher state (rising edge)
xStateDown	BOOL		FALSE	Switch to the next lower state (rising edge)
xResInit	BOOL		FALSE	Switch to the initialization state (rising edge)
bInitState	BYTE		0	Index of the initialization state
<br/>*<br/> arStates’	stChangeStateUpDown			Array with the individual states

Outputs

Name	Data type	Value range	Initial value	Function
<br/>*<br/> sStateName’	STRING			Name of the current state
<br/>*<br/> iStateNumber’	INT			Number of the current state

Function description

This FB is used to switch between freely definable states (each state is defined by a state text and a state number) using the inputs 'xStateUp' and 'xStateDown'. After the first download, a subsequent download, every online change and on every rising edge at input 'xResInit', the initial state is set. The index of the initial state is defined by the input 'bInitState'. In case of error, the string 'Error' is output at output 'sStateName' and the value -1 is output at output 'iStateNumber'. \

Typical application

This function block can be applied as follows:

CODESYS

InOut:

Scope	Name	Type	Initial
Input	xStateUp	BOOL	FALSE
Input	xStateDown	BOOL	FALSE
Input	xStateInit	BOOL	FALSE
Input	bInitState	BYTE	0
Output	sStateName	STRING
Output	iStateNumber	INT
Input	arStates	POINTER TO stChangeStateUpDown