Automating Manufacturing Systems - Process Control and ...

plc advanced functions - 16.5
A
FFL
source word_in
FIFO stack[0]
Control c
length 5
position 0
B
FFU
FIFO stack[0]
destination word_out
Control c
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 stack[0], stack[1], stack[2], stack[3] then stack[4].
When values are unloaded they will be taken from the last loaded position, so if the stack
is full the value of stack[4] will be removed first.
A
B
LFL
source word_in
LIFO stack[0]
Control c
length 5
position 0
LFU
LIFO stack[0]
destination word_out
Control c
length 5
position 0
Figure 16.5
LIFO Stack Commands
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