KEYENCE Visual KV Series - Manual (Page 217)

3.1 Interrupt Instructions
3-193
Visual KV
Series
1 3
Chapter 3 Interrupts
DI: Interrupt Disabled
EI: Interrupt Enabled
Disables execution of interrupt.
Enables execution of interrupt.
Example
Coding
Description
• When 1000 is ON, execution of interrupt is enabled.
• When 1000 is OFF, execution of interrupt is disabled.
• Interrupts are enabled between EI instruction and DI instruction.
• Once an EI instruction is executed, an interrupt is enabled until a DI instruction is
executed.
• Any interrupt is disabled when the Visual KV Series starts operation.
• The DI instruction disables execution of an interrupt. Use this instruction to
temporarily disable an interrupt.
• The EI instruction enables execution of an interrupt. Use this instruction to
release an interrupt that was disabled by a DI instruction.
• To execute another interrupt during execution of the previous interrupt, include EI
instruction in this first interrupt. EI-DI instruction set can be nested to four levels.
Note 1: When any interrupt occurs between DI and EI instructions (interrupt disabled
period), the disabled interrupt is stored (to 8 levels max.). The stored interrupt is
executed as soon as an EI instruction is executed.
Note 2: If an INT CTC instruction is stored before a RES CTC instruction is ex-
ecuted, the stored INT CTC is deleted.
Operands
Key operation
FUN
FUN
RES
0
ORL
3
DI
EI
SET
1
AND
8
1000
EI
DI
1000
FUN
FUN
SET
1
RES
0
AND
8
ORL
3
ENT
R-SRCH
ENT
R-SRCH
Line No. Instruction Operand
0000 LD 0000
0001 EI
• •
• •
• •
0021 LDB 1000
0022 DI
• •
• •
• •
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