[AnalogItemType] Accessing property 'EngineeringUnits'

[h.kron...@medek.at]

hi!

using open62541 version 0.3-rc2-445-g5c6bc7b3 with ua_namespace_zero=full the following code adds a variable of type 'analogitemtype' and tries to set the properties 'eurange' and 'engineeringunits':

static void create_model(UA_Server *server)
{
    UA_VariableAttributes attr = UA_VariableAttributes_default;

    attr.description = UA_LOCALIZEDTEXT("en-US", "My analog item");
    attr.displayName = UA_LOCALIZEDTEXT("en-US", "MyAnalogItem");
    attr.dataType = UA_TYPES[UA_TYPES_UINT32].typeId;
    attr.accessLevel = UA_ACCESSLEVELMASK_READ | UA_ACCESSLEVELMASK_WRITE;

    UA_QualifiedName qname = UA_QUALIFIEDNAME(1, "MyAnalogItem");
    UA_NodeId parent = UA_NODEID_NUMERIC(0, UA_NS0ID_OBJECTSFOLDER);
    UA_NodeId parent_ref = UA_NODEID_NUMERIC(0, UA_NS0ID_ORGANIZES);
    UA_NodeId nodeid;

    UA_StatusCode ret = UA_Server_addVariableNode(
            server,
            UA_NODEID_NULL,
            parent,
            parent_ref,
            qname,
            UA_NODEID_NUMERIC(0, UA_NS0ID_ANALOGITEMTYPE),
            attr,
            NULL,
            &nodeid);

    if (ret != UA_STATUSCODE_GOOD)
        UA_LOG_ERROR(UA_Log_Stdout, UA_LOGCATEGORY_USERLAND,
                "%s: %s", qname.name.data,
                UA_StatusCode_name(ret));

    qname = UA_QUALIFIEDNAME(0, "EURange");

    UA_Range minmax = { .low = 0.0, .high = 100.0 };

    ret = UA_Server_writeObjectProperty_scalar(
            server,
            nodeid,
            qname,
            &minmax,
            &UA_TYPES[UA_TYPES_RANGE]);

    if (ret != UA_STATUSCODE_GOOD)
        UA_LOG_ERROR(UA_Log_Stdout, UA_LOGCATEGORY_USERLAND,
                "%s: %s", qname.name.data,
                UA_StatusCode_name(ret));

    qname = UA_QUALIFIEDNAME(0, "EngineeringUnits");

    UA_EUInformation eu = {
        .namespaceUri = UA_STRING("somecompany.com"),
        .unitId = -1,
        .displayName = UA_LOCALIZEDTEXT("en-US", "m/s"),
        .description = UA_LOCALIZEDTEXT("en-US", "meter per second"),
    };

    ret = UA_Server_writeObjectProperty_scalar(
            server,
            nodeid,
            qname,
            &eu,
            &UA_TYPES[UA_TYPES_EUINFORMATION]);

    if (ret != UA_STATUSCODE_GOOD)
        UA_LOG_ERROR(UA_Log_Stdout, UA_LOGCATEGORY_USERLAND,
                "%s: %s", qname.name.data,
                UA_StatusCode_name(ret));
}

adding the variable and setting property 'eurange' succeeds but setting property 'engineeringunits' fails with error 'badnomatch'.

according to opcua spec 1.04 part 8 section 5.3.2 'analogitemtype' property 'engineeringunits' has modellingrule 'optional' and

to part 3 section 6.4.4.5.3 'optional' that (afaiu) an optional node may not be provided if it does not reference a mandatory node.

in case my assumption is correct how do i need to change the code to get access to property 'engineeringunits'?

best regards

horst

[marcus...@googlemail.com]

Hello Horst

I had the same problem. My solution is to use UA_NS0ID_ANALOGUNITRANGETYPE for creating the variable.

In your case:

    UA_StatusCode ret = UA_Server_addVariableNode(
            server,
            UA_NODEID_NULL,
            parent,
            parent_ref,
            qname,


            UA_NODEID_NUMERIC(0, UA_NS0ID_ANALOGUNITRANGETYPE ),
            attr,
            NULL,
            &nodeid);

Best regards

  Marcus