Programming a DataField for my Edge 520 I can see that the memory limit for this kind of application is 26 KB. Are 26 KB for each DataField you create or for all user defined data fields?
It's for each Data field. You can have multiple CIQ data fields and on the 520, each can use a peak of 26K. The 26K isn't the same on all devices 1.x devices are 16k, and some devices are more than 26K. (peak is key here. The bottom line of the sim is the current. File>view memory in the sim will show peak.
It's actually been 32k all along, but some of that is used by the VM, and in 2.3.x, that was 6k, leaving 26K. I don't have the 2.4.0 SDK handy to see what it is there.