OPCReconnect.g

Code

The code for this and other example scripts can be found in the DataHub distribution archive, typically at one of these locations: C:\Program Files\Cogent\OPC DataHub\scripts\ C:\Program Files\Cogent\Cascade DataHub\scripts\ Please refer to Section 3.1, “How to Run a Script” for more information on using scripts.

/* Sample script that disables the OPC connection labeled "OPC000", waits 2
 * seconds, then re-enables the connection.  The result will be that the
 * OPC DataHub disconnects from the server for 2 seconds and then reconnects.
 */

require ("Application");
require ("OPCSupport");

class OPCReconnect Application
{
}

/* Create an object that references an existing OPC connection that we have
 * configured through the user interface.  Its label is the first argument to
 * setServer below.  Once we have the OPC connection object, we can call
 * enable() with t or nil in the argument to enable or disable this connection.
 */
method OPCReconnect.enable(enabled)
{
    local	opcclient = new OPCConnection();
    opcclient.setVerbose(t);
    opcclient.setServer("OPC000");
    opcclient.enable(enabled);
}

method OPCReconnect.constructor ()
{
    .enable(nil);
    .TimerAfter(2, `(@self).enable(t));
}

ApplicationSingleton (OPCReconnect);