
Ladder Logic Elements and Instructions
362
870USE10110 July 2004
TEST Compares the magnitudes of the values in the top and
middle nodes
3
MU16 Signed/unsigned 16-bit multiplication 3
DV16 Signed/unsigned 16-bit division 3
ITOF Signed/unsigned integer-to-floating point conversion 3
FTOI Floating point-to-signed/unsigned integer conversion 3
EMTH Performs 38 math operations, including floating point
math operations and extra integer math operations such
as square root
3
Ladder Logic Subroutine Instructions
JSR Jumps from scheduled logic scan to a ladder logic
subroutine
2
LAB Labels the entry point of a ladder logic subroutine 1
RET Returns from the subroutine to scheduled logic 1
Other Special Purpose Instructions
CKSM Calculates any of four types of checksum operations
(CRC-16, LRC, straight CKSM, and binary add)
3
MSTR Specifies a function from a menu of networking
operations
3
PID2 Performs proportional-integral-derivative calculations for
closed-loop control
3
TBLK Moves a block of data from a table to another specified
block area
3
BLKT Moves a block of registers to specified locations in a table 3
XMIT Allows CPU to act as a Modbus master 3
Symbol Meaning Nodes Consumed
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