FB_TrackCalibration - StartMeasurement (Method)

Overview

Task

Starting the track measurement without writing the values to the segments.

Description

With the method StartMeasurement, you can start a measurement run for verifying the calibration of a Lexium™ MC multi carrier track.

Preconditions for the measurement process:

• Define the working direction of the track (not inverted or inverted) by the parameter Direction in the user function TrackGeometry of the track object Lexium MC Track. The default value for the parameter Direction is Not inverted / 1. (For more information on the parameter Direction, refer to the Lexium™ MC multi carrier Device Objects and Parameters Guide.)

• Ensure that there is not more than one carrier without tool and product on the track.

• Ensure that there are no mechanical obstacles for the carrier on the track.

• Select the following control loop parameters:

  • i_dwPosP := 500

  • i_dwVelP:= 2000

  • i_dwVelI := 500

• Perform the Init_Track routine of the project Multicarrier Example.

• Ensure that the carrier and the function block FB_Multicarrier are successfully enabled.

• Select the track calibration mode in the enumeration ET_ModeTrackCalibration, depending on the working direction of your Lexium™ MC multi carrier track in automatic operation mode.

Measurement process:

By calling the method StartMeasurement, you start the measuring process that runs without further user action. You can verify the status of the process through the property etState (see FB_TrackCalibration).

The measuring process includes the following stages:

1. The carrier moves to the initial position, which is the middle position of the first segment of the track.

2. The measurement is started.

3. The carrier moves around the track from segment to segment until it reaches the initial position.

4. The calibration values are calculated internally.

5. The parameters are not written to the segments.

6. The enumeration ET_StateTrackCalibration displays the status MeasurementSuccessful.

Inputs

Outputs