State Industries FANUC GFK-0827 - Manual (Page 14)

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3 GFK-0827 Chapter 1 Introduction
Features of the Hot Standby CPU Redundancy Product
H Bumpless 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
H No single point of failure (excluding Genius I/O)
H Redundant backup communications
H On–line repair of failed component
H On–line programming
H Same or different programs in Primary and Secondary units
H Redundancy CPU has a 16 MHz microprocessor,
configurable memory and
configurable addressing capacity
H Redundancy 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
H Status Bits (%S) reflect redundancy status of Primary/Secondary units
H Program control switching
H Memory parity and checksums
H Common I/O on Genius bus
H Background Diagnostics
– Processor test
– PLC CPU EPROM CRC Validation
– User program checksumming
– Time-of-Day/Elapsed Time Clock test
H 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.