FB_ALY_LatchingSwitch_1Ch

The Latching Switch 1Ch realizes a virtual impulse switch. The output alternates between TRUE and FALSE on each edge detected at the input.

Syntax

Definition:

FUNCTION_BLOCK FB_ALY_FlipFlop_2Ch
VAR_INPUT
    bPersistent: BOOL;
END_VAR
VAR_OUTPUT
    ipResultMessage: Tc3_EventLogger.I_TcMessage;
    bError: BOOL;
    bNewResult: BOOL;
    bConfigured: BOOL;
    bOut: BOOL;
    nCount: ULINT;
    fbTimeLastEvent: FB_ALY_DateTime;
END_VAR

Inputs

Name	Type	Description
bPersistent	BOOL	If the value is `TRUE`, the internal data is stored persistently.

Outputs

Name	Type	Description
ipResultMessage	I_TcMessage	Contains more detailed information on the current return value. This special interface pointer is internally secured so that it is always valid/assigned.
bError	BOOL	This output is `TRUE` if an error occurs.
bNewResult	BOOL	When a new result has been calculated, the output is `TRUE.`
bConfigured	BOOL	Displays `TRUE` when the function block is successfully configured.
bOut	BOOL	Result of the virtual impulse switch.
nCount	ULINT	Incremented when the output value changes.
fbTimeLastEvent	FB_ALY_DateTime	Timestamp of the last event.

Methods

Name	Definition location	Description
Call()	Local	Method for calculating the outputs for a specific configuration.
Configure()	Local	General configuration of the algorithm with its parameterized conditions.
ConfigureChannel()	Local	Channel-specific configuration for the respective algorithm.
Reset()	Local	Resets all internal states or the calculations performed so far.
SetChannelValue()	Local	Method for passing values to the algorithm.
SetInital()	Local	Method for setting initial values for the algorithms, e.g. already expired lifetime.

Properties

Name	Type	Access	Definition location	Initial value	Description
fTolerance	LREAL	Get, Set	Local	0.0	Tolerance value for the Equal / NotEqual comparisons

Sample

VAR
    fbLatchingSwitch : FB_ALY_LatchingSwitch_1Ch;
    fbSystemTime : FB_ALY_GetSystemTime;
    
    stConfig: ST_ALY_Threshold :=(eComparisonOperator:=E_ALY_ComparisonOperator.GreaterThan, fThreshold:= 0.5);
    bConfigure : BOOL := TRUE;
    
    nInput : INT;
END_VAR

// Get current system time
fbSystemTime.Call();

// Configure algorithm
IF bConfigure THEN
    bConfigure := FALSE;

    fbLatchingSwitch.ConfigureChannel(stConfig);    
    fbLatchingSwitch.Configure();
END_IF

// Call algorithm
fbLatchingSwitch.SetChannelValue(nInput);
fbLatchingSwitch.Call(fbSystemTime.tSystemTime);

Requirements

Development environment	Target platform	Plc libraries to include
TwinCAT v3.1.4024.0	PC or CX (x64, x86)	Tc3_Analytics

Further Information