Allen-Bradley Logix5000 Reference Manual page 377

Description:
IMPORTANT
Arithmetic Status Flags:
Fault Conditions:
Rockwell Automation Publication 1756-RM003N-EN-P - October 2011
Array (File)/Misc. Instructions (FAL, FSC, COP, CPS, FLL, AVE, SRT, STD, SIZE)
The number of bytes filled is:
Byte count = Length ∗ (number of bytes in the Destination data type)
You must test and confirm that the instruction doesn't change data that you don't
want it to change.
The FLL instruction operates on contiguous data memory. In some cases, the
instruction writes past the array into other members of the tag. This happens if the
length is too big and the tag is a user-defined data type.
If the tag is Then
User-defined data type If the Length is too big, the instruction writes past the end of the
array into other members of the tag. It stops at the end of the tag. No
major fault is generated.
NOT user-defined data type If the Length is too big, the instruction stops at the end of the array.
No major fault is generated.
The Length is too big if it is more than the total number of elements in the
Destination array.
For best results, the Source and Destination should be the same type. If you want
to fill a structure, use the COP instruction (see example 3 on
mix data types for the Source and Destination, the Destination elements are filled
with converted Source values.
If The Source Is
SINT, INT, DINT, or REAL
SINT, INT, DINT, or REAL
SINT, INT, DINT, or REAL
SINT, INT, DINT, or REAL
SINT
INT
DINT
REAL
Not affected
None
And The Destination Is The Source Is Converted
To
SINT SINT
INT INT
DINT DINT
REAL REAL
Structure SINT (not converted)
Structure INT (not converted)
Structure DINT (not converted)
Structure REAL (not converted)
Chapter 8
page 367). If you
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