Bradley Smoker PLC-5 Allowing or Inhibiting Startup, Defining a Controller Power-Up Procedure

14-2Preparing Power-Up Routines

Allowing or Inhibiting Startup

Defining a Controller Power-Up Procedure

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.

This Bit	Tells the Controller
user control	whether or not to scan a fault routine upon power up before
S:26/1	returning to normal program scan.
major fault S:11/5	whether or not to fault at the end of scanning the fault routine.

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.

If the Fault Routine	Then the Controller
Makes S:11/5
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

	You can use JMP and LBL instructions to scan only the
IMPORTANT
	portion of the fault routine associated with a particular
	fault or power-up condition.

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.

Publication 1785-UM012D-EN-P - July 2005