Preparing the Hot Standby System for CPU Update
 
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CPU LCD Display and Keypad
References about the CPU display and keypad are detailed in the Quantum Hardware Reference Manual:
Preparing the Hot Standby System
WARNING
UNEXPECTED EQUIPMENT BEHAVIOR
Design your application in such a way that your process is not impacted by a cycle time variation that might appear after a firmware update.
Failure to follow these instructions can result in death, serious injury, or equipment damage.
Preliminary steps required to update the Standby CPU in a Hot Standby system while the process is controlled by the Primary CPU:
Step
Action
1
Connect Unity Pro to the Primary CPU (through Modbus, Modbus Plus or USB).
2
Set the Command Register system bit %SW60.4 to 1.
3
Disconnect Unity Pro from the Primary CPU.