Panasonic FP-E Programming Manual page 208

Basic Instructions
Interrupt program execution
There are three types of interrupt.
Interrupts from a interrupt unit (corresponding to INT0 to INT15)
1
Interrupts are issued in response to the rise or fall of the interrupt unit input (whether rising or falling is
specified on the unit side).
Interrupts from an intelligent unit that issues interrupts (corresponding to INT16 to INT23)
2
Interrupts are issued in response to the operation status of an intelligent unit with an interrupt issuing
function.
Periodical interrupt (INT24)
3
The interrupt occurs in fixed time intervals. Set the time interval with the ICTL instruction.
When the interrupt occurs, the interrupt program with the corresponding number is executed.
Main program Execution
INT program
on
Interrupt input
off
If interrupts are disabled, an interrupt will occur only at the point when interrupts are enabled with the ICTL
instruction.
Execution
Main program
INT program
on
Interrupt input
off
When another interrupt program is being executed, an interrupt will occur after the current program is
completed.
Main program
INT1 program
INT2 program
on
Interrupt 2 input
off
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Execution
Execution
Execution
Enabled
Execution
Execution
Execution
FP2/FP2SH/FP10SH