8 APPLICATION INSTRUCTION
8.3 Program Execution Control Instruction
385
8
8.3
Program Execution Control Instruction
Disabling/enabling interrupt programs
DI, EI
Interrupts are usually disabled in CPU module. These instructions enable interrupts in CPU module (EI instruction) or disable
interrupts again (DI instruction).
• DI: Disables the execution of the interrupt program.
• EI: Releases the execution disabled state of interrupt programs.
Processing details
■
DI
• This instruction disables the execution of the interrupt program until the EI instruction is executed, even if the interrupt
cause occurs.
• When the power is turned on or the CPU module is reset, the state in which the DI instruction is executed is applied.
• For the operation of the DI instruction (DI instruction without an argument) when using the interrupt disable instruction with
a specified priority or lower (DI instruction with an argument), refer to
Page 387 Disabling the interrupt program with
■
EI
• This instruction releases the execution disabled state of interrupt programs when the DI instruction is executed, and
enables the execution of the interrupt program with the interrupt pointer number enabled by the IMASK instruction.
• For the operation of the EI instruction when using the interrupt disable instruction with a specified priority or lower (DI
instruction with an argument), refer to
Page 387 Disabling the interrupt program with specified priority or lower.
Ladder diagram
Structured text
ENO:=DI(EN);
ENO:=EI(EN);
FBD/LD
Even though an interrupt occurs between
the DI and EI instructions, the execution of
the interrupt is held until the processing
between the instructions ends.
A: Sequence program
B: Interrupt Program
EN
ENO
DI
EI
In
FEND
A
A
B
Summary of Contents for MELSEC iQ-F FX5
Page 1: ...MELSEC iQ F FX5 Programming Manual Instructions Standard Functions Function Blocks ...
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Page 1068: ...1066 29 COUNTER FUNCTION BLOCKS 29 4 Counter Function Block Operation error There is no error ...
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