plc function ref - 34.30

SQO - SeQuencer Output
		A		SQO
				SEQUENCER OUTPUT
				File	#N7:10
				Mask	FF00
				Dest	N7:0
				Control	R6:0
				Length	6
				Position	0

Description:	When the input goes from false to true the sequencer will output a value
	from a new position in the sequencer table. After the position has
	reached the length the sequencer will reset to position 1. Note that the
	first entry in the sequencer table will only be output the first time the
	function is un, or if reset has been used.
Status Bits:	EN	Enable - will be true when the input to the function is true
	DN	Done - will be set when the sequencer is fully loaded
	ER	Error - will be set when there has been an error
Registers:	none

Available on: Micrologix, PLC-5

34.1.10 Program Control

EOT - End Of Transition

	A
			EOT
Description:		This function will cause a transition in an SFC. This will be in a program
		file for an SFC step. When ’A’ becomes true the transition will end
		and the SFC will move to the next step and transitions.
Status Bits:		none

Registers: none

Available on: PLC-5

plc function ref - 34.31

FOR, NXT, BRK - For, Next, Break
	A		FOR
			FOR
			Label Number	0
			Index	N7:0
			Initial Value	0
			Terminal Value	10
			Step Size	2
	B
					BRK
	C		NXT
			NEXT
			Label Number	0

Description:

Status Bits:

Registers:

This instruction will create a loop like traditional programming languages with a start and end value with a step size for each loop. Instructions between the FOR and NXT will be repeated. If the line with the BRK statement becomes true, the NXT command will be ignored.

none

none

Available on: Micrologix, PLC-5

plc function ref - 34.32

JSR/SBR/RET - Jump Subroutine / Subroutine / Return
	A		JSR
			JUMP TO SUBROUTINE
			Program File	3
			Input par	N7:0
			Input par	N7:1
			Return par	N7:10
			Return par	N7:11
			Return par	N7:12
	B		SBR
			SUBROUTINE
			Input par	N7:20
			Input par	N7:21
	C		RET
			RETURN()
			Return par	N7:22
			Return par	N7:23
			Return par	N7:24

Description:	The JSR will jump to another program file and pass a list of arguments
	that can be a variable length. The first statement in the subroutine pro-
	gram file should be SBR to retrieve the arguments passed. The sub-
	routine will end with the RET command that will go back to where the
	JSR function was encountered. The RET function can return a vari-
	able number of arguments.
Status Bits:	none
Registers:	none

Available on: Micrologix, PLC-5

plc function ref - 34.33

SFR - Sequential Function chart Reset

	A		SFR
			SFC RESET
			Prog File Number 3
			Restart Step At
Description:
		This function will reset a SFC. In this example when ’A’ goes true the
		SFC main program stored in program file 3 will be examined. All sub
		programs will be examined, and then the SFC will be reset to the ini-
		tial position.
Status Bits:		none
Registers:		none

Available on: PLC-5

UID, UIE - User Interrupt Disable, User Interrupt Enable

A

UID

B

UIE

Description:

Status Bits:

Registers:

This instruction is used to turn of interrupts. If ’A’ is true, then the following ladder logic will be run without interrupts. If ’B’ is true the interrupts will be reenabled. These instructions will only be of concern when using user programmed interrupt functions. These are normally only used when a critical process may be completed within a given time, or when the ladder logic between the UID and UIE conflicts with one of the interrupt programs.

none

none

Available on: PLC-5