Understanding Basic Ladder Instructions

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02/24/97 1

Rockwell

AutomationHands-OnSeminar Series



2

02/24/97 2

SLC 500

BASIC LADDER

INSTRUCTIONS



3

02/24/97 3

Advanced Instructions

Math

Add

Subract

Multiply

Divide

Comparison

reater !han

"ess !han#$ual

%ot #$ual

reater !han or #$ual

"ess !han or #$ual

Data Movement

Move

CopyClear



402/24/97 4

Math Instructions - ADD

Source A & Source ' ( Dest

N7:0 10

N7:1 5

N7:2 15 )* & + ( )+

ADD

Source A N7:0

Source B N7:1

Dest N7:2

ADDI:1

0



502/24/97 5



N7:0 1

N7:1 5

N7:1 6 ) & + ( ,

ADD

Source A N7:0

Source B N7:1

Dest N7:1

ADDI:1

0

Application Runnin. !otal



602/24/97 6



N7:0 1

N7:1 5

N7:1 6 ) & + ( ,

%O!# !his instruction e/ecutes every scan that therun. is true0 there1ore use a One-Shot OSR2

ADD

Source A N7:0

Source B N7:1

Dest N7:1

ADDI:1

0

B3

0

OSR

Application Runnin. !otal



702/24/97 7

Math Instructions - S3'!RAC!

Source A - Source ' ( Dest

N7:0 10

N7:1 5

N7:2 5 )* - + ( +

SUBTRACT

Source A N7:0

Source B N7:1

Dest N7:2

SUBI:1

0



802/24/97 8

Math Instructions - M3"!I4"5

Source A / Source ' ( Dest

N7:0 10

N7:1 5

N7:2 50 )* / + ( +*

MULTIPLY

Source A N7:0

Source B N7:1

Dest N7:2

MULI:1

0



902/24/97 9

Math Instructions - DI6ID#

Source A 7 Source ' ( Dest

N7:0 10

N7:1 5

N7:2 2 )* 7 + ( 8

DIVIDE

Source A N7:0

Source B N7:1

Dest N7:2

DIVI:1

0

S:13 0 remainder

S:14 2 unrounded quotient

MathRe.ister {



1002/24/97 10

Math Instructions - DI6ID#

Source A 7 Source ' ( Dest

N7:0 29

N7:1 10

N7:2 3 89 7 )* ( 829

DIVIDE

Source A N7:0

Source B N7:1

Dest N7:2

DIVI:1

0

S:13 9 remainder

S:14 2 unrounded quotient

MathRe.ister {



1102/24/97 11

Comparison Instructions :

GREATER THAN

Source A N7:0

Source B N7:1

GTR0:3

0

( )

I; Source A : Source ' !H#% !R3# #"S# ;A"S#

N7:0 29

N7:1 10

89 : )* !R3#there1ore Output is#ner.i<ed



1202/24/97 12

Comparison Instructions =

LESS THAN

Source A N7:0

Source B N7:1

LES0:3

0

( )

I; Source A = Source ' !H#% !R3# #"S# ;A"S#

N7:0 29

N7:1 10

89 = )* ;A"S#there1ore Output isde-#ner.i<ed



1302/24/97 13

Comparison Instructions (

EQUAL

Source A N7:0

Source B N7:1

EQU0:3

0

( )

I; Source A ( Source ' !H#% !R3# #"S# ;A"S#

N7:0 29

N7:1 10

89 ( )* ;A"S#there1ore Output isde-#ner.i<ed



1402/24/97 14

Comparison Instructions ≠

NOT EQUAL

Source A N7:0

Source B N7:1

NEQ0:3

0

( )

I; Source A ≠ Source ' !H#% !R3# #"S# ;A"S#

N7:0 29

N7:1 10

89 ≠ )* !R3#there1ore Output is#ner.i<ed



1502/24/97 15

Comparison Instructions

GRTR THAN OR EQUAL

Source A N7:0

Source B N7:1

GEQ0:3

0

( )

I; Source A Source ' !H#% !R3# #"S# ;A"S#

N7:0 29

N7:1 10

89 )* !R3#there1ore Output is#ner.i<ed



1602/24/97 16

Comparison Instructions

LESS THAN OR EQUAL

Source A N7:0

Source B N7:1

LEQ0:3

0

( )

I; Source A Source ' !H#% !R3# #"S# ;A"S#

N7:0 29

N7:1 10

89 )* ;A"S#there1ore Output isde-#ner.i<ed



1702/24/97 17

Data Movement - Move

MOVE

Source N7:0

Dest N7:1

MOVI:1

0

Source Dest

N7:0 50

N7:1 50



1802/24/97 18

Data Movement - Copy

COPY FILE

Source #N7:0

Dest #N7:5

Length 4

COPI:1

0

Source Dest

N7:0 10N7:1 20N7:2 30N7:3 40

N7:4N7:5 10N7:6 20N7:7 30N7:8 40

}

}



1902/24/97 19

Data Movement - Clear

CLEAR

Dest N7:1

CLRI:1

0

>ero Dest

N7:0 50

N7:1 0



2002/24/97 20

Advanced Instructions

A%5 ?3#S!IO%S@@@

MathAdd

Subract

Multiply

Divide

Comparisonreater !han

"ess !han

#$ual

%ot #$ual

reater !han or #$ual"ess !han or #$ual

Data MovementMove

Copy

Clear



2102/24/97 21

!imer Addressin. and 4arameters

4reset !*24R# How long the timer should time or!

Accumulated !*2ACC How long the timer h"s timed or "lre"d#!

Done !*BD% $et to %1& when "''umul"ted "lue *reset "lue!

!imer !imin. !*B!! $et to %1& when "''umul"ted "lue + *reset "lue!

#nable !*B#% $et to %1& when the rung 'ont"ining the timer is true!

!*

;ile !ype

;ile %umber

!imer %umber

*-8++

!imers

,ile 'ont"ins 256timers

-reset ."lue

''umul"ted ."lue

15 14 13

ord 0

ord 1

ord 2



2202/24/97 22

he imers %done it& turns the motor o "ter " 10 se'ond time del"#!

!IM#R O% D#"A5

!imer !*

!ime 'ase )2*

4reset )*

Accum *

Stop Start Motor

E/F E F

E F

I:1/0I:1/1

M)

O:3/0

O:3/0

E F

M)

O:3/0

EBF

T4:0/DN

#%

D%

!imer Done

!imers

!O%



2302/24/97 23

!imers

!IM#R O% D#"A5

!imer !*!ime 'ase )2*

4reset )*

Accum *

!O%

E F #%

D%

O%-O;;

Selector Switch

I:2/2

Motor

E F O:3/0T4:0/TT

!imer !imin.

he imers %timin. bit& turns the motor on or onl# 10 se'onds!

Understanding Basic Ladder Instructions

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