Interrupt is an expansion function in the CQM1 PLC and would have to be set up as such. For information on function INT (89) download this manual. CQM1 Manual
If you have a CQM1H then that requires a different manual. CQM1H Manual
There is also an IORF (I/O refresh) function. You will also find that in the manual.
beerchug
Here's a short tutorial on Omron interrupts written by ED Allen, Omron's interrupt guru, with sample programs for CX Programmer. Event Based Programming