How to create a OPC tag runtime

Question

I have a Kepware OPC server and I am able to connect with my client (OPC Foundation UA lib). I created a device in Kepware and a group inside. I would like to read opc tags from the database and create them dynamically.

How do I create an item with address in PLC dynamically ?

kahveci kahveci · Accepted Answer · 2018-03-27T21:22:52

I can recommend you take a look at KepServerEX Configuration API. Basically, it gives you complete remote management and configuration control over all your KEPServerEX instances. In your case, you can dynamically generate tags through a simple RESTful API call at the device level after reading required information (e.g. tag name, tag address, tag datatype) from your database.

Please refer to this guide for more information in order to enable and test Configuration API.

I also copied the following piece of code from Kepware's sample project to give you an idea:

function createTag(inputServer, inputChannel, inputDevice, inputTag, inputTagAddr) {
    console.log("Creating " + inputTag + " with address " + inputTagAddr);
    $.ajax({
        type: 'POST',
        url: 'http://' + inputServer + '/config/v1/project/channels/' + inputChannel + '/devices/' + inputDevice + '/tags',
        data: '{"common.ALLTYPES_NAME":"' + inputTag + '","servermain.TAG_ADDRESS":"' + inputTagAddr + '","servermain.TAG_DATA_TYPE":' + inputTagType + '}',
        contentType: 'application/json',
        xhrFields: {
            withCredentials: false
        },
        headers: {
            'Authorization': 'Basic ' + encodeAuth
        },
        success: function(JSON, status, xhr) {
            console.log(inputTag + " created under " + inputDevice);
        },
        error: function(JSON, status, xhr) {
            console.log("Creation of " + inputTag + " failed!");
        }
    });
}

How to create a OPC tag runtime

2 Answers