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OPC T8030S

Issue 23 April 10 PD-T8030S 26

2.7. Reserved Variables

The OPC Server provides summary data on each Controller.

The tagnames below are built in the following format.

<Rootname> The name of the server, as configured in the System Preferences tab (OPC Root

name). By default this is TrustedEthernetIF.

<controller> The name of the controller, as configured in the Controllers tab. By default these are

Controller0, Controller1, Controller2 etc.

2.7.1. Controller Information

The following OPC tags are automatically available at the Controller level.

<Rootname>.<controller>._OPC_COMMS_FAILURE_1

(and _OPC_COMMS_FAILURE_2 if two communications ports were defined)

This is used to indicate the status of the controller to server connection. ‘Off’ indicates that the

connection is working, and ‘On’ indicates a failure. Type Boolean.

<Rootname>.<controller>._OPC_SERVER_HEARTBEAT_

This is a counter that changes from 0 to 59 at a rate of one change per second. This can be used to

periodically ensure that the server is still functioning correctly. Type Integer.