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Id

Read TwinCAT TIA
Local File and directory access JSON reader ActiveJsonDocuments A JSON document

ns=2;s=DEPRAG Smart/Local/FileAndDirectoryAccess/Json/ActiveJsonDocuments/0/Id

Unique index

Examples:

In addition to the parameters already explained, the following variables must be created / transferred for the implementation in TwinCAT 3:

Beckhoff parameter:

    bJsonReadId
    A boolean variable that can be used to trigger the execution of the ReadId command.
    OutputDataJsonReadId
    A variable of type "DINT" into which the return value of the ReadId method is written.
    hrJsonReadId
    This can be used to monitor the execution of the command. Error codes have the type "HRESULT".
    fbJson
    An instance of the "FB_Json" function block supplied with the DEPRAG Smart library.
    ClientId
    A STRING(255) variable that uniquely identifies the JSON document in the ActiveJsonDocuments list.
    ConnectionHandle
    "ConnectionHandle" received when establishing a connection between DEPRAG Smart Server and your OPC UA client. 


VAR
   bJsonReadId        : BOOL;
   OutputDataJsonReadId     : DINT;
   hrJsonReadId       : HRESULT;

   fbJson : FB_Json;
END_VAR

hrJsonReadId := fbJson.ReadId(
       bExecute    := bJsonReadId,
       ConnectionHandle  := depragSmartConnection.ConnectionHandle,
       ClientId   := '0',
       Output    => OutputDataJsonReadId);
IF hrJsonReadId <> S_FALSE THEN 
    bJsonReadId := FALSE;
END_IF

For examples and explanations regarding the calls of nodes via Siemens TIA Portal please refer to the sub-menu "Siemens TIA Portal" in section "Getting Started".