Panasonic FP-E Programming Manual page 210

Basic Instructions
Control when more than one interrupt occurs simultaneously.
When more than one interrupt occurs simultaneously, the interrupt program with the smaller number is
executed first. The other interrupt programs are then placed in the execution waiting state. After the first
interrupt program is completed, the other programs will be executed in order from the smallest number to the
greatest.
Example:
Main program
INT1 program
INT2 program
INT3 program
INT1 input
INT2 input
INT3 input
When more than one interrupt occurs while a interrupt program is being executed, the other programs will be
executed in order from the smallest number to the greatest after the program currently being executed is
finished.
Example:
Main program
INT1 program
INT2 program
INT3 program
INT4 program
INT1 input
INT2 input
INT3 input
INT4 input
During execution of the INT3 program in the example above,
the INT2 input occurred before INT1. But, after INT3 program is
done, the INT1 program is executed first and then INT2 is
executed.
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FP2/FP2SH/FP10SH