FB_ALY_NumericalCompare_2Ch

The Numerical Compare 2Ch compares the input values of the first channel with the input values of the second channel and provides the result of this comparison operation. The operator and the count mode can be configured individually.

Syntax

Definition:

FUNCTION_BLOCK FB_ALY_NumericalCompare_2Ch
VAR_INPUT
    bPersistent: BOOL;
END_VAR
VAR_OUTPUT
    ipResultMessage: Tc3_EventLogger.I_TcMessage;
    bError: BOOL;
    bNewResult: BOOL;
    bConfigured: BOOL;
    bOperationOut: 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.
bOperationOut	BOOL	Result of the comparison operation.
nCount	ULINT	Incremented when the output value is `bOperationOut=TRUE`. The behavior depends on the configuration parameter `eCountMode`.
fbTimeLastEvent	FB_ALY_DateTime	Timestamp of the last change to `bOperationOut=TRUE`.

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.
Reset()	Local	Resets all internal states or the calculations performed so far.
SetChannelValue()	Local	Method for passing values to the algorithm.

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
    fbNumericalCompare : FB_ALY_NumericalCompare_2Ch;
    fbSystemTime : FB_ALY_GetSystemTime;
    eComparisonOperator : E_ALY_ComparisonOperator := E_ALY_ComparisonOperator.GreaterThan;
    eCountMode : E_ALY_CountMode := E_ALY_CountMode.OnChange;
    bUseAbsValues : BOOL := FALSE;
    bConfigure : BOOL := TRUE;
    nInputCh1 : INT;
    fInputCh2 : LREAL;
END_VAR

// Configure algorithm
IF bConfigure THEN
    bConfigure := FALSE;
    
    fbNumericalCompare.Configure(eComparisonOperator, eCountMode, bUseAbsValues);
END_IF

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

// Call algorithm
fbNumericalCompare.SetChannelValue(1, nInputCh1);
fbNumericalCompare.SetChannelValue(2, fInputCh2);
fbNumericalCompare.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