FB_TrackCalibration - StartCalibration (Method)

Overview

Type:

Method

Available as of:

V1.2.5.0

Task

Starting the track calibration.

Description

With the method StartCalibration, you can start the process of calibrating a Lexium™ MC multi carrier track.

Preconditions for the calibration 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.


Calibration process:

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

The calibration 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. (The motion parameters are defined inside the library).

  4. The calibration values are calculated internally.

  5. The parameters are written to the segments.

  6. The enumeration ET_StateTrackCalibration displays the status TrackCalibrationSuccessful.


NOTE: If at the end of the track calibration process, the status message TrackCalibrationSuccessful is not displayed, you must repeat the process from the start.
NOTE: After the calibration process, you must perform a hardware reboot of the Lexium™ MC multi carrier track to activate the new calibration values.
NOTE: After the track calibration, the absolute positions on the track could be shifted. Therefore, verify the positions of the stations on the track.
NOTE: Do not execute any other move command during calibration run.
NOTE: The derived calibration result fits a unique hardware setup and only the selected track calibration mode. To get the best calibration results, repeat the calibration if the hardware setup was modified (exchange of any segments or change of their order) or the application movement direction changed.

Inputs

Input

Data type

Description

i_etMode

ET_ModeTrackCalibration

Access to the enumeration ET_ModeTrackCalibration for selecting the track calibration mode, depending on the working direction of the track in automatic operation mode.

Outputs

Output

Data type

Description

q_xError

BOOL

Indicates TRUE if an error has been detected. For details, refer to q_etResult and q_sResultMsg.

q_etResult

ET_Result

Provides diagnostic and status information as a numeric value.
If q_xError = FALSE, q_etResult provides status information.
If q_xError = TRUE, q_etResult provides diagnostic/error information.

q_sResultMsg

STRING [255]

Provides additional diagnostic and status information as a text message.