FB_ALY_ProductivityDiagnosis_3Ch

The Productivity Diagnosis 3Ch algorithm calculates the productivity of the process during a production interval. The diagram below schematically illustrates the relationship between the production process and the individual production cycles.

The production interval can be started and stopped via the input Is Producing. During the execution of the production interval, the production cycles are counted. Each production cycle corresponds to one piece produced. A production cycle starts with an edge at Start Cycle and stops with an edge at Stop Cycle. The productivity over the entire production interval (Productivity) is calculated after stopping the interval when the signal Is Producing no longer meets the condition for Threshold Level Producing. The completed production cycles and therefore all finished pieces are taken into account. Productivity is calculated as the ratio of pieces actually produced per time and the target value of pieces to be produced in a given time. The output Productivity Last Cycle is calculated from the time required for the last production cycle in relation to the configured time for a piece. Any break times between cycles are not taken into account. The output Expected Productivity estimates the total productivity during the production interval. For this purpose, the previous production time is extrapolated to the total productivity for the target value of the pieces to be produced. The algorithm can be configured with the target value for the Produced Pieces within a configured interval (Production Time), e.g. 1 piece in 30 seconds or 50 pieces per hour.

Syntax

Definition:

FUNCTION_BLOCK FB_ALY_ProductivityDiagnosis_3Ch
VAR_OUTPUT 
    ipResultMessage: Tc3_EventLogger.I_TcMessage;
    bError: BOOL;
    bNewResult: BOOL;
    bConfigured: BOOL;
    bProducing: BOOL;
    bCycleFinished: BOOL;
    fProductivity: LREAL;
    fProductivityLastCycle: LREAL;
    fExpectedProductivity: LREAL;
    fbElapsedTime: FB_ALY_Timespan;
    nProductionCycles: ULINT;
END_VAR

Outputs

Methods

Properties

Sample

VAR
    fbProductivityDiagnosis : FB_ALY_ProductivityDiagnosis_3Ch;
    fbSystemTime : FB_ALY_GetSystemTime;
    stThresholdIsProducing : ST_ALY_Threshold;
    stThresholdStartCycle : ST_ALY_Threshold;
    stThresholdStopCycle : ST_ALY_Threshold;    
    nNumProducedPieces : ULINT := 40;
    tProductionTime : LTIME := LTIME#1H;
    bConfigure : BOOL := TRUE;
    bIsProducing : BOOL;
    bStartProductionCycle : BOOL;
    bStopProductionCycle : BOOL;
END_VAR

// Configure algorithm
IF bConfigure THEN
    bConfigure := FALSE;
    
    stThresholdIsProducing.eComparisonOperator := E_ALY_ComparisonOperator.Equals; 
    stThresholdIsProducing.fThreshold := 1;
    stThresholdStartCycle.eComparisonOperator := E_ALY_ComparisonOperator.Equals; 
    stThresholdStartCycle.fThreshold := 1;
    stThresholdStopCycle.eComparisonOperator := E_ALY_ComparisonOperator.Equals; 
    stThresholdStopCycle.fThreshold := 1;
    
    fbProductivityDiagnosis.ConfigureChannel(1, stThresholdIsProducing);
    fbProductivityDiagnosis.ConfigureChannel(2, stThresholdStartCycle);
    fbProductivityDiagnosis.ConfigureChannel(3, stThresholdStopCycle);
    fbProductivityDiagnosis.Configure(nNumProducedPieces, tProductionTime);
END_IF

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

// Call algorithm
fbProductivityDiagnosis.SetChannelValue(1, bIsProducing);
fbProductivityDiagnosis.SetChannelValue(2, bStartProductionCycle);
fbProductivityDiagnosis.SetChannelValue(3, bStopProductionCycle);
fbProductivityDiagnosis.Call(fbSystemTime.tSystemTime);

Requirements