Mission-critical systems, applications in harsh environments and facilities where even short failures, e.g. owing to cost restraints are not tolerated, are the main fields of activity of Hot-Standby Redundancy. In addition, control engineering applications with their requirement of bumpless switchover, i.e. no deviation between values when switching the master CPU, can only be implemented in this redundancy version.
With redundancy on all system levels, i.e. hardware, system software, application programming and maintenance and monitoring interfaces, Hot-Standby Redundancy provides maximum reliability with outstanding convenience at the same time.
The full integration of configuration, programming and monitoring in Bachmann tools shortens application creation and minimizes deviations with respect to everyday standard operating sequences. At the same time, risks in the course of maintenance operations, error corrections and application updates decrease during the process in operation.
Hot-Standby Redundancy combines the highest redundancy technology and the best performance possible with the customary robustness of every Bachmann module.
Features
Hot-Standby Redundancy enhances Network Redundancy by the following attributes, among others:
Fully automatic matching of process variables
Automatic failover upon detecting internal errors
Integrated self-tests for checking the system status
Automatic system matching (system software, configuration, application programs)
Automatic application synchronization (variance < 200 µs)
Millisecond-precise synchronization of all stations
Network switching time freely configurable (0 to 10 PLC cycles)
Bumpless switchover
Redundancy programming support in M-PLC (IEC 61131-3)
Debugging and forcing of variables in redundant applications (M-PLC)
Resistant to single-fault events, additionally many multifault scenarios are overridden on a continuous basis
Integration in SolutionCenter
Applying, monitoring and deleting redundancy devices
Extra support in Device Navigator and Device Manager for configuring, monitoring and logging redundant application programs
Textual and graphical redundancy status displays
Virtual redundancy devices with the option of applying and manipulating redundancy configurations and application programs
Redundancy master status information
Device designation
Current redundancy status of the overall system
CPU information
System software information
Network information
Redundancy application status information
Current redundancy status (REDUNDANT/SINGLE/ ERROR)
Runtime state (RUN/STOP/ERROR)
Error status codes
Synchronization status
Cycle Time
Maintenance interface for redundancy systems integrated (execution of commands on both master CPUs at the same time)
All commands and monitoring mechanisms are available to the operator as open user interfaces and/or as system variables.
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