Application Restrictions
Original instructions
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Exclusive Use of MAST Tasks
Certain programming methods cannot be in HOT Standby applications.
Timer Events and I/O Errors
Timer events are NOT synchronized in Quantum Hot Standby applications. Schneider Electric recommends not using timer events.
NOTE: If timer events are used, the detected I/O errors are not exchanged between Primary CPU and Standby CPU.
Mast Task Cycle Time and Watchdog
The Quantum Hot Standby system is optimized for applications with MAST task cycle times between, for a:
WARNING
UNEXPECTED EQUIPMENT OPERATION
The drop hold up time must be set to at least 4 times the MAST task watchdog value.
Failure to follow these instructions can result in death, serious injury, or equipment damage.