User guide

Instructions
Chapter 23
Bit Shift, FIFO, and LIFO
23–8
SLC 5/02 Processors Only
LIFO Load, LIFO Unload LFL, LFU Output Instructions
(LFL) (LFU)
(EN)
(DN)
(EM)
LFL
LIFO LOAD
Source N7:10
LIFO #N7:12
Control R6:0
Length 34
Position 0
(EU)
(DN)
(EM)
LFU
LIFO UNLOAD
LIFO #N7:12
Dest N7:11
Control R6:0
Length 34
Position 0
F1 F2 F3 F4 F5
ZOOM on LFL –(LFL)– 2.3.0.0.2
NAME: LIFO LOAD
SOURCE: N7:10 LENGTH: 34
LIFO: #N7:12 POSITION:0
CONTROL: R6:0
EN EU DN EM
0 0 0 0
EDT_DAT
HHT Ladder Display:
HHT Zoom Display:
Ladder Diagrams and APS Displays:
(online monitor mode)
F1 F2 F3 F4 F5
ZOOM on LFU –(LFU)– 2.4.0.0.2
NAME: LIFO UNLOAD
LIFO: #N7:12 LENGTH: 34
DEST: N7:11 POSITION:0
CONTROL: R6:0
EN EU DN EM
0 0 0 0
EDT_DAT
(monitor mode)
These instructions are the same as the FIFO load and unload instructions
except that the last data loaded is the first data to be unloaded.
FIFO and LIFO instruction applications include assembly/transfer lines,
inventory control, and system diagnostics.
Entering Parameters
The instruction parameter information on page 23–6 applies. Substitute
instruction mnemonics LIFO for FIFO, LFL for FFL, and LFU for FFU.
LIFO Load (LFL), LIFO
Unload (LFU)