Beckhoff EPP3504-0023 Short Manual page 87

Commissioning
nSTATE_SCALE_OFFSET :INT := 0;
bScaleOffsetStart :BOOL := FALSE;
bScaleOffsetDone :BOOL := FALSE;
fOffsetDeviationVal :REAL;
nOFFSET_MIN_VAL_REF :WORD := 200; // Max. limit value for offset
// Variables used for gain scaling:
nSTATE_SCALE_GAIN :INT := 0;
bScaleGainStart :BOOL := FALSE;
bScaleGainDone :BOOL := FALSE;
nPRESET_MAX_VAL :REAL := 3000000; // Target amplitude value
// ===============================================
// Variables for evaluating of gain and offset:
nOffset :REAL := 0; // Offset value
nGain :REAL := 1; // Gain value
nScaledSampleVal :REAL;
nDINT_Value :DINT;
fb_trig_bEnable :R_TRIG; // Trigger FB for Enable
bError :BOOL := FALSE; // Evaluate..
END_VAR
Execution part:
// THIS CODE IS ONLY AN EXAMPLE - YOU HAVE TO CHECK APTITUDE FOR YOUR APPLICATION
// Example program 1 and 2 program code:
// =====================================
// 1. PAI setting of 0x80n0:2E must be "Extended Range" at first
// 2. When writing of scaling values were done, switch to "Linear"
// Calculation of the temporary value (..and use for ScopeView to check)
nScaledSampleVal := nOffset + nGain * DINT_TO_REAL(nPAI_Sample);
// Main-State Procedure:
CASE nMainCal_State OF
0:
fb_trig_bEnable(CLK:=(bEnable AND NOT bError));
IF fb_trig_bEnable.Q THEN // Poll switch or button
// Initialize temporary offset and gain values:
nOffset:= 0;
nGain := 1;
bScaleOffsetStart := bScalingOrder;
bScaleGainStart := NOT bScalingOrder;
fb_get_min_max.nMinFreqInput := fMinFrequencyIn;
nMainCal_State := 10; // Start
END_IF
10:
IF (bScaleGainDone AND NOT bScalingOrder)
OR (bScaleOffsetDone AND bScalingOrder) THEN
bScaleOffsetStart := NOT bScalingOrder;
bScaleGainStart := bScalingOrder;
nMainCal_State := nMainCal_State + 10;
END_IF
20:
IF bScaleGainDone AND bScaleOffsetDone THEN
nMainCal_State :=0; // All done, initalization for next start
EPP3504-0023 Version: 1.2 87