Rockwell Automation 1785-Lxxx Enhanced and Ethernet PLC-5 Programmable Controllers - Manual (Page 236)

Publication 1785-UM012D-EN-P - July 2005
14-2 Preparing Power-Up Routines
Allowing or Inhibiting
Startup Major fault bit S:11/5 controls whether you can power up the controller in run
mode after a loss of power. Do not confuse this bit with user control bit
S:26/1.
After a power loss is experienced while the controller is in run mode, the
controller automatically sets major fault bit S:11/5 if user control bit S:26/1
has been set.
Defining a Controller
Power-Up Procedure The user control bits S:26/0 and S:26/1 define how the controller starts in run
mode after a power loss or when you switch to run mode from program or test
mode.
This Bit Tells the Controller
user control
S:26/1 whether or not to scan a fault routine upon power up before
returning to normal program scan.
major fault S:11/5 whether or not to fault at the end of scanning the fault routine.
If the Fault Routine
Makes S:11/5 Then the Controller
Set (1) Faults at the end of scanning the fault
routine
Leave this bit set to inhibit startup
Reset (0) Resumes scanning the controller memory file
Reset this bit to allow startup
IMPORTANT
You can use JMP and LBL instructions to scan only the
portion of the fault routine associated with a particular
fault or power-up condition.