Fifo Load (Ffl); Relay Ladder - Allen-Bradley Logix5000 Reference Manual

Chapter 9 Array (File)/Shift Instructions (BSL, BSR, FFL, FFU, LFL, LFU)

FIFO Load (FFL)

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The FFL instruction copies the Source value to the FIFO.
Operands:

Relay Ladder

Operand
Source
FIFO
Control
Length
Position
If you use a user-defined structure as the data type for the Source or FIFO
operand, use the same structure for both operands.
Rockwell Automation Publication 1756-RM003N-EN-P - October 2011
Type Format
SINT Immediate
INT Tag
DINT
REAL
string
structure
The Source converts to the data type of the array tag. A smaller integer
converts to a larger integer by sign-extension.
SINT Array tag
INT
DINT
REAL
string
structure
CONTROL Tag
DINT Immediate
DINT Immediate
Description
Data to be stored in the FIFO
FIFO to modify
Specify the first element of the FIFO
Do not use CONTROL.POS in the subscript
Control structure for the operation
Typically use the same CONTROL as the
associated FFU
Maximum number of elements the FIFO can
hold at one time
Next location in the FIFO where the
instruction loads data
Initial value is typically 0