Automating Manufacturing Systems - Process Control and ...

plc advanced functions - 16.5
A
FFL
source I:001
FIFO N7:0
Control R6:0
length 5
position 0
B
FFU
FIFO N7:0
destination O:003
Control R6:0
length 5
position 0
Figure 16.4
FIFO Stack Instructions
The LIFO stack commands are shown in Figure 16.5. As values are loaded on the
stack the will be added sequentially N7:0, N7:1, N7:2, N7:3 then N7:4. When values are
unloaded they will be taken from the last loaded position, so if the stack is full the value of
N7:4 will be removed first.
A
B
LFL
source I:001
LIFO N7:0
Control R6:0
length 5
position 0
LFU
LIFO N7:0
destination O:003
Control R6:0
length 5
position 0
Figure 16.5
LIFO Stack Commands