Bradley Smoker PLC-5 user manual Monitoring Faults, Block-Transfers in Fault Routines

Preparing Fault Routines 15-11

Block-Transfers in Fault Routines

If the controller runs a fault routine that contains block-transfer instructions, the controller performs these block-transfers immediately upon completing any block-transfers currently in the active buffer, ahead of block-transfer requests waiting in the queue.

The block-transfers in a fault routine should be between the controller and local I/O only.

ATTENTION

If you program block-transfer instructions to remote chassis within a fault routine, be aware that all ladder scanning will stop until the block transfer either completes or errors.

Testing a Fault Routine

Monitoring Faults

To test a fault routine, use a JSR instruction to jump to the fault routine. Send a fault code as the first input parameter of the JSR instruction. The controller stores the fault code in S:12 and sets the corresponding bit in S:11.

You can detect and set your own faults by using fault codes 0-9 or by using the controller-defined fault codes 10-87.

Monitor controller faults using the controller status screen in your programming software.

You can Monitor	Description	See Page
Minor and major faults	Controller faults are categorized into major and minor faults.	15-12
	The controller displays a unique bit for each fault and displays
	text that describes the fault.
Fault codes	Fault codes provide information about controller-defined	B-5
	errors.
Global status bits	Global status bits are set if a fault occurs in any one of the	15-13
	logical racks.
Multiple chassis status	Multiple chassis status bits are used to monitor the racks in	15-13
bits	your I/O system.

Publication 1785-UM012D-EN-P - July 2005