Truncate (Trn); Relay Ladder; Structured Text; Function Block - Allen-Bradley Logix5000 Reference Manual

Chapter 16 Math Conversion Instructions (DEG, RAD, TOD, FRD, TRN, TRUNC)

Truncate (TRN)

dest := TRUNC(source);
Input Parameter Data Type
EnableIn BOOL
Source REAL
Output Parameter Data Type
EnableOut BOOL
Dest DINT
570
The TRN instruction removes (truncates) the fractional part of the Source and
stores the result in the Destination.
Operands:

Relay Ladder

Operand
Source
Destination

Structured Text

Use TRUNC as a function. This function truncates source and stores the result in
dest.
See Structured Text Programming
within structured text.

Function Block

Operand
TRN tag

FBD_TRUNCATE Structure

Description
Enable input. If cleared, the instruction does not execute and outputs are not updated.
Default is set.
Input to the conversion instruction.
Valid = any float
Description
The instruction produced a valid result.
Result of the conversion instruction. Arithmetic status flags are set for this output.
Rockwell Automation Publication 1756-RM003N-EN-P - October 2011
Type Format
REAL Immediate
Tag
SINT Tag
INT
DINT
REAL
for information on the syntax of expressions
Type
FBD_TRUNCATE
Description
Value to truncate
Tag to store the result
Format Description
Structure TRN structure