If X0= ON, execute the call instruction and jump to P10. After executing the subroutine,
return the original step via SRET instruction.
Program the tag with FEND instruction (will describe this instruction later)
In the subroutine 9 times call is allowed, so totally there can be 10 nestings.
When calling the subprogram, all the timer, OUT, PLS, PLF of the main program will keep
the status.
All the OUT, PLS, PLF, timer of subprogram will keep the status when subprogram
returning.
Do not write pulse, counter or timer inside the subprogram which cannot be completed in one
scan period.
Subprogram executing diagram:
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