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Features of the Hot Standby CPU Redundancy Product
HBumpless switching h Synchronized CPUs
h 20 millisecond scan extension (nominal). This figure is variable, depending on amount of data transferred.
h One scan switching (in most cases) h Configurable backup data size
HNo single point of failure (excludingGeniusI/O)
HRedundant backup communications
HOn±line repair of failed component
HOn±line programming
HSame or different programs in Primary and Secondary units
HRedundancy CPU has a 16 MHz microprocessor, configurable memory and configurable addressing capacity
HRedundancy Communications Module
h Manual pushbutton switch for switching control between active and backup CPUs
h Five Status LEDs
±Board OK
±Local System Ready
±Local System Active
±Remote System Ready
±Remote System Active
HStatus Bits (%S) reflect redundancy status of Primary/Secondary units
HProgram control switching
HMemory parity and checksums
HCommon I/O on Genius bus
HBackground Diagnostics
±Processor test
±PLC CPU EPROM CRC Validation
±User program checksumming
±
HMemory Protect Keyswitch
Benefits of the Hot Standby CPU Redundancy Product
Implementation of the Hot Standby CPU Redundancy product provides you with a method of ensuring that a critical control system or process is uninterrupted in the event of a failure of any single component (excluding I/O) of the PLC system.
Chapter 1 Introduction | 3 |
