Bradley Smoker PLC-5 Example of Comparing a Major Fault Code with a Reference, Then faults

15-8Preparing Fault Routines

6.If the controller finds a match, the FSC instruction sets the found (.FD) bit in the specified control structure.

7.Use a MOV instruction to clear the fault in S:11. In the following figure, #N10:0 is the reference file.

Example of Comparing a Major Fault Code with a Reference

	FSC
FILE SEARCH/COMPARE
Control		R6:0
Length		20
Position		0
Mode		ALL
Expression
	S:12 = #N10:0

R6:0

RES

R6:0

U

IN

EN

DN

ER

R6:0 ] [

FD

MOV

MOVE

Source0

DestS:11

TND

Remainder of fault routine follows

If the Fault Routine	Then the Controller
clears S:11	returns to the program file and
	resumes program execution.
does not clear S:11	executes the rest of the fault routine
	and then faults

IMPORTANT

If the fault routine clears the major fault, the controller completes the fault routine and returns to the next instruction in the program file that follows the one that contained the faulted instruction.

The remainder of the rung is executed and it appears that the fault never occurred. The fault routine execution continues until you correct the cause of the fault.

Publication 1785-UM012D-EN-P - July 2005