Allen-Bradley PLC-5 User Manual page 237

If You are With
Using SFCs No fault routine
Not using SFCs Fault routine
Using a fault file SFCs
Not using a fault file Not using SFCs
Each x indicates a bit that can be 0 or 1 for the status value described.
To set and reset bits:
1. Cursor to the bit location.
2. Set by entering 1; reset the bit by entering 0.
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.
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
And You Want to:
Restart at the first step
Restart at the last active step
Start at the first file
Restart using the fault routine file
Restart using the fault file and then the first step
Restart using the fault file and then the last active step xxxxxxxx xxxxxx11
Start at the first file in the controller's memory.
Preparing Power-Up Routines
Then Set Bit 0 and 1 as Shown:
15..............0
xxxxxxxx xxxxxx00
xxxxxxxx xxxxxx01
xxxxxxxx xxxxxx0x
xxxxxxxx xxxxxx1x
xxxxxxxx xxxxxx10
xxxxxxxx xxxxxx00
Publication 1785-UM012D-EN-P - July 2005
14-3