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3GFK-0827 Chapter 1 Introduction
Features of the Hot Standby CPU Redundancy Product
Bumpless switching
Synchronized CPUs
20 millisecond scan extension (nominal). This figure is variable, depending on
amount of data transferred.
One scan switching (in most cases)
Configurable backup data size
No single point of failure (excluding Genius I/O)
Redundant backup communications
On–line repair of failed component
On–line programming
Same or different programs in Primary and Secondary units
Redundancy CPU has a 16 MHz microprocessor, configurable memory and
configurable addressing capacity
Redundancy Communications Module
Manual pushbutton switch for switching control between active and backup
CPUs
Five Status LEDs
– Board OK
– Local System Ready
– Local System Active
– Remote System Ready
– Remote System Active
Status Bits (%S) reflect redundancy status of Primary/Secondary units
Program control switching
Memory parity and checksums
Common I/O on Genius bus
Background Diagnostics
– Processor test
– PLC CPU EPROM CRC Validation
– User program checksumming
– Time-of-Day/Elapsed Time Clock test
Memory 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.