Effects On Index Register S:24; Fifo Load (Ffl) And Fifo Unload (Ffu) - Allen-Bradley SLC 500 Series Reference Manual
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Table of Contents
5-26
Data Handling Instructions
FIFO Load (FFL) and FIFO
Unload (FFU)
FFL
FFL
FIFO Load
EN
Source
N7:69
DN
FIFO
#N7:76
Control
R6:0
Length
48<
EM
Position
0<
FFU
FFU
FIFO Unload
FIFO
#N7:76
Dest
N7:70
Control
R6:0
Length
48<
Position
0<
Fixed SLC
SLC
SLC
5/01
5/02
5/03
•
•
Output Instructions
Publication 1747-RM001G-EN-P - November 2008
Effects on Index Register S:24
The value present in S:24 is overwritten with the position value when a
false-to-true transition of the FFL/FFU or LFL/LFU rung occurs. For the
FFL/LFL, the position value determined at instruction entry is placed in S:24.
For the FFU/LFU, the position value determined at instruction exit is placed
in S:24.
When the DN bit is set, a false-to-true transition of the FFL/LFL rung does
not change the position value or the index register value. When the EM bit is
set, a false-to-true transition of the FFU/LFU rung does not change the
position value or the index register value.
FFL and FFU instructions are used in pairs. The FFL instruction loads words
into a user-created file called a FIFO stack. The FFU instruction unloads
words from the FIFO stack, in the same order as they were entered.
Instruction parameters have been programmed in the FFL-FFU instruction
pair shown on page 5-27.
EU
DN
EM
SLC
SLC
5/04
5/05
•
•
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