FB_VN_WriteMlModel

Syntax

Definition:

FUNCTION_BLOCK FB_VN_WriteMlModel
VAR_INPUT
    ipMlModel : Reference To  ITcVnMlModel;
    sFilePath : STRING;
    bWrite    : BOOL;
    nTimeout  : TIME;
END_VAR
VAR_OUTPUT
    bBusy     : BOOL;
    bError    : BOOL;
    nErrorId  : UDINT;
END_VAR

Inputs

Name	Type	Default	Description
ipMlModel	Reference To ITcVnMlModel		The machine learning model to write
sFilePath	STRING		Full path of the file or relative path to the default directory on the target pc (e.g. only a file name). If the string is empty, a file name will be generated (containing the current time).
bWrite	BOOL		Writing the machine learning model is triggered by a rising edge at this input.
nTimeout	TIME	VISION_ADS_TIMEOUT	Indicates the time before the function is cancelled.

Outputs

Name	Type	Description
bBusy	BOOL	This output remains TRUE until the function block has executed a command, but at the longest for the duration supplied to the 'nTimeout' input. While bBusy = TRUE, no new command will be accepted at the inputs.
bError	BOOL	This output is switched to TRUE as soon as an error occurs during the execution of a command. The command-specific error code is contained in ‘nErrorId’. If the function block has a timeout error, 'bError' is TRUE and 'nErrorId' is 1861 (hexadecimal 0x745). Is reset to FALSE by the execution of a command at the inputs.
nErrorId	UDINT	Contains the ADS error code or the command-specific error code of the last executed command. Is reset to 0 by the execution of a command at the inputs.

Further information

The function block FB_VN_WriteMlModel saves an ML model from a file asynchronously into the PLC.

Parameter

Some parameters are described centrally in the section File Access Parameters.

ML model

The ML model ipMlModel is saved under the specified file path in binary format.

The saving of a ITcVnColorModel represents a special case, since this must still be converted first with the following row into a ML model. Alternatively, Color Model can be replaced by ITcVnMlModel with the corresponding functions.

hr := ipColorModel.TcQueryInterface(IID_ITcVnMlModel, ADR(ipWriteMlModel));

File path and format

If sFilePath is empty, a file name with the current time is generated and the extension vmlm is used.

Application

Saving an ML model to the file C:\TcVision\MlModel.vmlm looks like this, for example:

fbWriteMlModel(
    ipMlModel    := ipWriteMlModel,
    sFilePath    := 'C:\TcVision\MlModel.vmlm', 
    bWrite       := TRUE,
    nTimeout     := T#500MS);

IF NOT fbWriteMlModel.bBusy AND NOT fbWriteMlModel.bError THEN
    // Ml-Model was written successfully to file
END_IF

Related function block: FB_VN_ReadMlModel.

Required License

TC3 Vision Base

System Requirements

Development environment	Target platform	PLC libraries to include
TwinCAT V3.1. 4024.44 or later	PC or CX (x64) with PL50, e.g. Intel 4-core Atom CPU	Tc3_Vision