Panasonic FP-E Programming Manual page 204

Basic Instructions
When another interrupt program is being executed, an interrupt will occur after the current program is
completed.
Main program
INT1 program
INT2 program
on
INT2 input
off
Precautions during programming for all types
If either the INT instruction or IRET instruction is missing, a syntax error will result.
When an interrupt is issued, the operation memory corresponding to the interrupt input contact does not
undergo I/O refreshing. Therefore, contacts other than the interrupt input contact, such as the constantly−on
relay R9010, should be specified by the input conditions in the interrupt program.
INT
Specify R9010 or other
contact instead of X5.
X5
F0 MV, K10, DT100
IRET
A subroutine program cannot be used in an interrupt program.
INT
SUB 11
RET
IRET
An interrupt program cannot be used in a subroutine program.
SUB 11
INT
Interrupt program
IRET
RET
Interrupt program cannot be programmed into another interrupt program.
INT
INT
IRET
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Execution
Execution
Execution
5
1
Subroutine
0
Subroutine
0
1
FP0/FP0R/FP−e/FPΣ/FP−X