Indirect addressing in Micrologix 1400

I am confused.

I am using indirect addressing to copy from one point to another based on an integer file but I got one Copy instruction that works and then one that doesn't.

I will attach a screen shot and the first one validates but I get an error on the second one that says "File number doesn't point to the correct file type!". They look the same to me.

Does F200 file exist?

Yes it does. It is highlighting the #F[N33:1]:0 when I get that warning.

If N33:1 contains a value at the time of verification that points to a nonexistent file, you will get that warning. If you have taken steps to ensure that N33:1 can never contain an invalid value at runtime, you can ignore the error.

Like Okie said - if you have a number in N33 that points to a missing F data file the error will occur. So if N33:1 is 33, the system will look for F33:0 which can't exist.
You would get the same error on the top instruction if N37:7 was equal to 37.

If you don't have a lot of checks in place to restrict the possible values in your N registers, then you would need a ton of possible F data files and would end up maxing the memory out in the 1400.

Maybe restructuring some logic to always start with a known data file like F100:[N33:1] could be more robust? A limitation there is that N33:1 can't be over 255