Omron SYSMAC CS Series Instruction & Reference Manual page 512

3. Instructions
 FIFO
When CIO 0.00 is ON in the following example, FIFO(633) reads the content of D4 (TB+4 for the stack
beginning at D0) and writes that data to D300.
0.00
TB
Stack
Last word
in stack pointer
Stack
pointer
Last word
in stack
After the data is written to D300, the stack pointer is decremented by one and the remaining data is
shifted down. (The content of D5 is shifted to D4 and the content of D6 is shifted to D5.)
478
D0
D300
TB:
D0
PC memory address
D1
of last word in stack
D2
Stack pointer
D3
D4
D5
D6
D7
D8
D9
D0
PC memory address
of last word in stack
D1
D2
Stack pointer
D3
D4
D5
D6
–1
D7
D8
D9
Read by FIFO(633).
D: D300
D: D300
CS/CJ/NSJ Series Instructions Reference Manual (W474)