Description
Foxboro PO923DB
Technical Specifications
- Function: Redundancy Management and Synchronization.
- Switchover Time: Bumpless transfer in <100ms.
- Sync Link: Dedicated high-speed synchronization interface.
- Voting Logic: Advanced health monitoring and voting algorithms.
Functional Features
- Seamless Failover: Primary to secondary switchover is transparent to the process and operator.
- Continuous Sync: Real-time mirroring of memory, logic, and I/O data.
- Fault Detection: Rapid detection of CPU, memory, and communication failures.
- Manual Override: Allows operators to force switchover for maintenance.
Application Scenarios
Mission-critical applications where any controller downtime is unacceptable, such as utility control, pipeline SCADA, and safety systems.
Performance Parameters
- Data Consistency: Bit-exact synchronization between primary and secondary.
- Recovery Time: Automatic resynchronization after fault clearance.
- Reliability: Extremely high MTBF.
Material Composition
High-reliability components designed for continuous operation. Redundant internal paths for critical functions.
Structural Characteristics
Standard module form factor. Front panel LEDs indicate Primary/Secondary status, Sync OK, and Fault conditions. Dedicated sync port for cable connection.
Working Principle
The module continuously compares the state of the primary and secondary controllers. If the primary fails, the module instantly promotes the secondary to primary status, using the synchronized data to maintain process continuity without a bump.
Installation Requirements
Install redundant controllers in adjacent or designated slots. Connect the dedicated synchronization cable securely. Ensure both controllers have identical firmware and configuration.
Usage Precautions
- Never remove both redundant controllers simultaneously.
- Monitor sync status regularly; a loss of sync must be addressed immediately.
- Test redundancy switchover during planned outages to verify functionality.
