Publication 1785-UM012D-EN-P - July 2005
Preparing Power-Up Routines 14-3
To set and reset bits:
1. Cursor to the bit location.
2. Set by entering 1; reset the bit by entering 0.
The above table describes the possible start-up routines. For more information
about fault routines, see chapter 16.
See chapter 21 for definitions of the user control bits (S:26/0-6).
Possible Controller Power-Up Routines
Use this Bit To
0 Control controllers that are using SFCs
This bit determines if the SFC restarts or resumes at the last active
step after a power loss.
1 Select power-loss protection
If this bit is set and a power loss occurs, the controller sets major
fault bit 5 and executes a fault routine you define before it returns to
normal program scan.
If You are With And You Want to: Then Set Bit 0 and 1 as Shown:
15..............0
Using SFCs No fault routine Restart at the first step xxxxxxxx xxxxxx00
Restart at the last active step xxxxxxxx xxxxxx01
Not using SFCs Fault routine Start at the first file xxxxxxxx xxxxxx0x
Restart using the fault routine file xxxxxxxx xxxxxx1x
Using a fault file SFCs Restart using the fault file and then the first step xxxxxxxx xxxxxx10
Restart using the fault file and then the last active step xxxxxxxx xxxxxx11
Not using a fault file Not using SFCs Start at the first file in the controller’s memory. xxxxxxxx xxxxxx00
Each x indicates a bit that can be 0 or 1 for the status value described.
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