FMD88 Interrupt function not working

[CPEng]

I have an new FMD88 (r77) firmware trying to count a flow meter and the interrupt seems to be broken.

I read in the manual that inputs #3-#6 can be used interrupt pins, so I hook up the meter to #3 pin.

I create a init function that runs first scan with the code:
intrdef 3,2,1

Then create function #2 "Count" with code
A= A+1

Program and transfer, then online monitoring of A variable and nothing. But I see the light for input #3 flashing.

Just to double check, I comment out the interrupt statement, then use ladder to scan input #3 and run a "diff up" function #2. Variable 'A' increments as it should, so the controller is receiving the signal.

Just to be sure I tried the same thing on input #4.
Is there something I'm missing?

Thanks

[support]

It should be INTRDEF 1,2,1

Input #3 = Interrupt channel #1.
Input #4 = Interrupt channel #2.
Input #5 = Interrupt channel #3.
Input #6 = Interrupt channel #4.

[CPEng]

Thats what it was, thank you.

I couldn't find anything in the manual under the interupt section that states this so it might be helpful for others if its updated.

[support]

Thank you for your feedback. The special digital I/Os are tabled in Chapter 6 but I guess it will help to repeat the info on the interrupt section. We will suggest that for inclusion in future release of the User's Manual.