
Ladder Logic Elements and Instructions
870USE10110 July 2004 361
Standard Ladder
Logic
Instructions
The table below provides standard ladder logic instructions and their meaning.
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
R"T Moves register values to a table 3
T"R Moves specified table values to a register 3
T"T Moves a specified set of values from one table to another
table
3
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
DX Matrix Instructions
AND Logically ANDs two matrices 3
OR Does logical inclusive OR of two matrices 3
XOR Does logical exclusive OR of two matrices 3
COMP Performs logical complement of values in a matrix 3
CMPR Logically compares values in two matrices 3
MBIT Logical bit modify 3
SENS Logical bit sense 3
BROT Logical bit rotate 3
AD16 Signed/unsigned 16-bit addition 3
SU16 Signed/unsigned 16-bit subtraction 3
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