Mitsubishi Electric MELSEC-Q Structured Programming Manual page 124

FXCPU Structured Programming Manual
[Device & Common]
2) Timer interrupt pointers: 3 points
The PLC executes an interrupt routine program at every specified interrupt cycle time (10 to 99 ms).
Use these pointers for control which requires cyclic interrupt processing without regard to the operation
cycle of the PLC.
FX /FX /FX
0S 0
Input No.
I6
I7
I8
*1. Cleared in FX
"STOP".
Operation
[Main program]
[Interrupt program]
(Event: I620)
122
/FX /FX /FX PLCs do not support timer interrupt pointers.
0N 1S 1N 1NC
An integer from 10 to 99 is put in the "
Example: I610 = Timer interrupt at every 10 ms
/FX /FX /FX
3S 3G 3GC
EI
EN ENO
FEND
EN ENO
Interrupt at every 20 ms
Interrupt cycle (ms)
" portion of the pointer name.
/FX PLCs when the PLC mode switches from "RUN" to
3U 3UC
Interrupts
are enabled.
Main
program
End of
main program
Interrupt
routine
2.11 Pointer [P and I]
Interrupt disabling
• Timer interrupts are enabled after the EI
instruction.
It is not necessary to program the DI
(disable interrupt) instruction when the
timer interrupt disabled zone is not
required.
• "FEND" indicates the end of the main
program.
• The PLC executes an interrupt routine at
every 20 ms.
2 Devices in Detail
flag
*1
M8056
*1
M8057
*1
M8058