Avoid data loss with OPC redundancy

Engineers and technicians use OPC Expert to increase the reliability and availability of OPC servers. Using its built-in redundancy feature, OPC Expert connects to two different OPC servers and monitors the data connection 24/7. Both hot and warm redundancy is available, and when it comes to failover, it’s all automatic or you can easily configure custom triggers. OPC Expert is more than a troubleshooting tool – it helps create a more reliable network.

OPC Redundancy Case Study

Connect to redundant OPC servers and avoid data loss with hot and warm redundancy. Connect OPC client applications such as process historians, operator consoles (HMI) or any custom application to OPC Expert’s embedded OPC server to ensure third-party applications benefit from data reliability through automated failovers.
Visually create redundancy objects by dragging the primary OPC server and dropping it onto the standby OPC server. OPC Expert’s configuration window enables error-free setup of redundancy capabilities. OPC Expert will receive data from all OPC servers to ensure data is never lost, while monitoring each OPC server to determine if it can rely on its connection and data. Automated triggers include server connectivity and response, while custom triggers can force failovers based on data events.
Hot redundancy enables OPC Expert to receive data from all OPC servers simultaneously. If communication is lost from one OPC server, the other keeps providing data. In effect, there are no primary or standby computers, because both are primary; this ensures data is not lost while requiring controllers to provide data to two OPC servers simultaneously.
Warm redundancy enables OPC Expert to connect to both OPC servers, but provides data only from the Primary. If communication with the Primary fails, OPC Expert provides data from the Standby. During failover, there may be a brief moment of data loss as the Standby begins receiving data; controllers, however, only provide data to one OPC server at a time.
Failover triggers include a combination of built-in automated features and user-defined triggers to handle any failure scenario.
Automated triggers enable OPC Expert to automatically failover from one OPC server to another when it detects a lost connection. Such events include a network connection failure, failed OPC servers (for example when OPC servers crash) or even non-responsive OPC servers. OPC Expert does not require user configuration for this failover, making it immediately useful with no configuration.
Custom triggers enable users to force (trigger) a failover when a value does not change (i.e. the value is stale), if a value goes beyond a preset limit or if a value does change (i.e. a manual failover). OPC Expert also enables users to create custom calculations, thus triggering failovers only when multiple events occur.