Program Execution Control Instructions; Disabling/Enabling Interrupt Programs - Mitsubishi Electric MELSEC iQ-R Series Programming Manual

7.3

Program Execution Control Instructions

Disabling/enabling interrupt programs

DI, EI
RnPCPU RnPCPU
RnCPU RnENCPU
(Process) (Redundant)
• DI: This instruction disables execution of interrupt programs.
• EI: This instruction clears the interrupt disabled state.
Ladder
FBD/LD
EN ENO
■Execution condition
Instruction
DI
EI
Processing details
■DI
• This instruction disables execution of interrupt programs until the EI instruction is executed even though they are
requested.
• When the system is powered on or the CPU module is reset, the system is in the state where the DI instruction has been
executed.
• For the operation of the DI (Disabling interrupt programs) instruction used with the DI (Disabling interrupt programs with
specified priority or lower) instruction, refer to the following.
Page 544 DI
• The DI (Disabling interrupt programs) instruction cannot be executed in interrupt programs. If executed, no processing is
performed.
RnSFCPU RnSFCPU
(Standard) (Safety)
Execution condition
Every scan
ST
ENO:=DI(EN);
ENO:=EI(EN);
7 APPLICATION INSTRUCTIONS
7.3 Program Execution Control Instructions
7
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