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The OPC DA agent forms the interface between a configurable OPC DA server and the Alarm Control Center. The OPC DA agent connects to the OPC DA server and cyclically queries the values of OPC items. If a value meets a specified condition, the agent forwards the information to the Alarm Control Center and the alerting process starts.
For the configuration of the OPC DA agent, the OPC items to be checked are defined together with a condition. If this condition occurs or if this condition is violated, the agent generates a corresponding message and forwards it to the Alarm Control Center. The ACC then begins the alerting process and informs the specified group of recipients.
The alarm status of a message can also be reported back to the OPC server by the OPC DA agent.
The OPC items are queried by the OPC server after a defined time interval. Both the current value and the previous value are taken from the OPC DA Agents cached for subsequent evaluations.
The following OPC items are queried:
The OPC DA agent cyclically checks whether the value of an OPC item has changed and thus fulfills a condition that should result in the triggering of a message. Here it is possible to evaluate a single bit of an OPC item or, alternatively, to look at the entire value of an integer OPC item.
Increased reliability is ensured by the ACC Monitoring option. The option monitors all functions of the Alarm Control Center and also provides the following functionalities for the OPC DA agent:
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