Ladder Logic Elements and Instructions

Standard Ladder Logic Elements, Continued

Standard Ladder The table below provides standard ladder logic instructions and their meaning.

Logic

Instructions

Symbol

Meaning

Nodes Consumed

 

 

 

 

 

Counter and Timer Instructions

 

 

 

 

 

 

UCTR

Counts up from 0 to a preset value

2

 

 

 

 

 

DCTR

Counts down from a preset value to 0

2

 

 

 

 

 

T1.0

Timer that increments in seconds

2

 

 

 

 

 

T0.1

Timer that increments in tenths of a second

2

 

 

 

 

 

T.01

Timer that increments in hundredths of a second

2

 

 

 

 

 

T1MS

A timer that increments in milliseconds

3

 

 

 

 

 

Integer Math Instructions

 

 

 

 

 

 

ADD

Adds top node value to middle node value

3

 

 

 

 

 

SUB

Subtracts middle node value from top node value

3

 

 

 

 

 

MUL

Multiplies top node value by middle node value

3

 

 

 

 

 

DIV

Divides top node value by middle node value

3

 

 

 

 

 

DX Move Instructions

 

 

 

 

 

 

RT

Moves register values to a table

3

 

 

 

 

 

TR

Moves specified table values to a register

3

 

 

 

 

 

TT

Moves a specified set of values from one table to

3

 

 

another table

 

 

 

 

 

 

BLKM

Moves a specified block of data

3

 

 

 

 

 

FIN

Specifies first-entry in a FIFO queue

3

 

 

 

 

 

FOUT

Specifies first-entry out of a FIFO queue

3

 

 

 

 

 

SRCH

Performs a table search

3

 

 

 

 

 

STAT

CROSS REF

1

 

 

 

 

Continued on next page

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Schneider Electric Processor Adapter manual Logic Instructions, Symbol Meaning, Counter and Timer Instructions