Common Items; How To Disable Interrupt Function And Pulse Catch Function - Mitsubishi Electric MELSEC FX3U Programming Manual

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
36.2

Common Items

36.2.1 How to disable interrupt function and pulse catch function

This section describes how to disable the interrupt function and pulse catch function.
1. Limiting the program interrupt range [interrupt function and pulse catch function]
1) Programming method
Program the FNC 05 (DI) instruction to set the interrupt disabled zone.
Even if an interrupt is generated between the DI instruction and EI instruction (interrupt disabled zone),
the interrupt is executed after the EI instruction.
2) Program example
FNC 04
FNC 05
FNC 06
FEND
3) Cautions
a) The interrupt inputs with special auxiliary relay for interrupt disable (M8050 to M8059) turned ON are
excluded.
These special auxiliary relays are not valid for the pulse catch function.
b) When the disabled zone is long, interrupts are accepted, but the interrupt processing is started after
considerable time.
When the interrupt disabling setting is not required, program only EI instruction. It is not always
necessary to program DI instruction.
EI
Interrupts are
enabled
DI
Interrupts are
disabled
36 Interrupt Function and Pulse Catch Function
36.2 Common Items
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B
851