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T1/T1S User’s Manual
7. Instructions
FUN 140
EI
Enable interrupt
Expression
Input
-
[ EI ]
-
Output
Function
When the input is ON, this instruction enables the execution of user designated interrupt operation, i.e.
timer interrupt program and I/O interrupt programs.
Execution condition
Input
Operation
Output
OFF
No execution
OFF
ON
Execution
ON
Operand
No operand is required.
Example
In the above example, the DI instruction disables the interrupt. Then the EI instruction enables the
interrupt again. As a result, the rung 2 instructions can be executed without interruption between
each instructions.
Note
·
Refer to the DI instruction (FUN 141).
·
If an interrupt factor is occurred during the interrupt disabled state, the interrupt is kept waiting and
it will be executed just after the EI instruction is executed.
·
The EI instruction can be used only in the main program.
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