Bradley Smoker PLC-5 user manual Program Control Instructions

D-22Instruction Set Quick Reference

Instruction						Description
					Sequencer Output	When the rung goes from false-to-true, the SQO instruction
		SQO
	SEQUENCER OUTPUT				SQO	increments to the next step in the sequencer File (#N7:1). The
						data in the sequencer file is transferred through a Mask (0F0F)
		File	#N7:1	# Status Bits:
						to the Destination (O:014) for every scan that the rung
		Mask	0F0F		EN - Enable	remains true.
		Dest	O:014		DN - Done Bit
		Control	R6:20		ER - Error Bit	See page F-8 for a description of prescan operation for
		Length	4
						this instruction.
		Position	0

Program Control Instructions

	Instruction						Description
				( MCR )		Master Control Reset	If the input conditions are true, the program scans the rungs
						MCR	between MCR instruction rungs and processes the outputs
							normally. If the input condition is false, rungs between the
							MCR-instruction rungs are executed as false.
10						Jump	If the input conditions are true, the controller skips rungs by
			( JMP )			JMP	jumping to the rung identified by the label (10).
10						Label	When the controller reads a JMP instruction that corresponds
						LBL	to label 10, the controller jumps to the rung containing the label
				LBL			and starts executing.
							Important: Must be the first instruction on a rung.
						FOR Loop	The controller executes the rungs between the FOR and the
		FOR
		FOR				FOR	NXT instruction repeatedly in one program scan, until it reaches
							the terminal value (10) or until a BRK instruction aborts the
		Label Number			0
							operation. Step size is how the loop index is incremented.
		Index			N7:0
		Initial Value			0		See page F-8 for a description of prescan operation for
		Terminal Value			10		this instruction.
		Step Size			1

NXT
NEXT
Label Number	0

Next

NXT

The NXT instruction returns the controller to the corresponding FOR instruction, identified by the label number specified in the FOR instruction. NXT must be programmed on an unconditional rung that is the last rung to be repeated in a For-Next loop.

BRK

Break	When the input conditions go true, the BRK instruction aborts a
BRK	For-Next loop.

Publication 1785-UM012D-EN-P - July 2005