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File Fill (FLL)
Array (File)/Misc. Instructions (FAL, FSC, COP, CPS, FLL, AVE, SRT, STD, SIZE) Chapter 8
Operands:
The FLL instruction fills elements of an array with the Source value. The
Source remains unchanged.
Relay Ladder
Operand
Source
Type
SINT
INT
DINT
REAL
Destination
SINT
Length
INT
DINT
REAL
structure
DINT
Format:
immediate tag
Description
element to copy
Important: the Source and Destination operands should be the same data type, or unexpected results may occur tag initial element to be overwritten by the Source
Important: the Source and Destination operands should be the same data type, or unexpected results may occur
The preferred way to initialize a structure is to use the COP instruction.
immediate number of elements to fill
Structured Text
Structured text does not have an FLL instruction, but you can achieve the same results using a SIZE instruction and a FOR...DO or other loop construct.
SIZE(destination,0,length);
FOR position = 0 TO length-1 DO destination[position] := source;
END_FOR;
See Appendix C, Structured Text Programming for information on the syntax of constructs within structured text.
Publication 1756-RM003K-EN-P - July 2008
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361
Chapter 8 Array (File)/Misc. Instructions (FAL, FSC, COP, CPS, FLL, AVE, SRT, STD, SIZE)
Description:
The number of bytes filled is:
Byte count = Length
∗
(number of bytes in the Destination data type)
IMPORTANT
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
user-defined data type
NOT user-defined data type
Then
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.
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 page 359).
If you 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
And The Destination Is The Source Is
Converted To
SINT SINT
INT
DINT
REAL structure
INT
DINT
REAL
SINT (not converted) structure structure structure
INT (not converted)
DINT (not converted)
REAL (not converted)
Arithmetic Status Flags:
not affected
Fault Conditions:
none
362
Publication 1756-RM003K-EN-P - July 2008
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Array (File)/Misc. Instructions (FAL, FSC, COP, CPS, FLL, AVE, SRT, STD, SIZE) Chapter 8
Execution:
Condition
prescan rung-condition-in is false rung-condition-in is true
Relay Ladder Action
The rung-condition-out is set to false.
The rung-condition-out is set to false.
end_address = start_address + (Length
∗ number of bytes in a destination element)
end_address > end of destination array yes no
end_address = end of destination array
source_address = Source postscan
destination_address =
end_address
yes no copy data in source_address to destination
_address
destination_address =
destination_address + 1 rung-condition-out is set to
true
end
The rung-condition-out is set to false.
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363
Chapter 8 Array (File)/Misc. Instructions (FAL, FSC, COP, CPS, FLL, AVE, SRT, STD, SIZE)
Example:
The FLL instruction copies the value in value_1 into dest_1
Relay Ladder
Source (value_1)
Data Type
Source (value_1)
Value
SINT
DINT
SINT
REAL
SINT
16#80 (-128)
16#1234 5678
16#01
2.0
16#01
Destination
(dest_1) Data Type
DINT
SINT
REAL
INT
TIMER
Destination
(dest_1) Value
After FLL
16#FFFF FF80 (-128)
16#78
1.0
16#0002
16#0101 0101
INT
DINT
16#0001
16#0000 0001
TIMER
TIMER
16#0101 0101
16#0101 0101
16#0001 0001
16#0001 0001
16#0001 0001
16#0000 0001
16#0000 0001
16#0000 0001
Structured Text
dest_1 := value_1;
364
Publication 1756-RM003K-EN-P - July 2008
Artisan Technology Group - Quality Instrumentation ... Guaranteed | (888) 88-SOURCE | www.artisantg.com
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