1 Publication 1756-PM001H-EN-P - June 2005
Chapter
15
Handle a Major Fault
Using This Chapter
Use this chapter to develop logic that handles specific fault conditions.
Develop a Fault Routine
If a fault condition occurs that is severe enough for the controller to shut
down, the controller generates a major fault and stops the execution of logic.
• Depending on your application, you may not want all major faults to
shut down your entire system.
• In those situations, you can use a fault routine to clear a specific fault
and let at least some of your system continue to operate.
For this information: See page:
Develop a Fault Routine 15-1
Programmatically Clear a Major Fault 15-5
Clear a Major Fault During Prescan 15-7
Test a Fault Routine 15-10
Create a User-Defined Major Fault 15-11
Major Fault Codes 15-14
EXAMPLE
Use a fault routine
In a system that uses recipe numbers as indirect addresses, a miss-typed
number could produce a major fault, such as type 4, code 20.
To keep the entire system from shutting down, a fault routine clears any
type 4, code 20, major faults.
