hi all, we are busy developing a machine and noticed we cannot assign permanent variable memory size on x20em1612, the program keeps complaining about memory offset issues but when we try to change the pv size the option doesn’t exist ,if I replace the cpu with x20cp0484 the option appears again
Hello Austin,
permanent PVs has been eliminated in new PLC models, and future models will not feature it either. However, it is no longer necessary. You can save variables in remanent PVs. Remanent PVs is cleared only during a cold start of the PLC. Since the PLC does not perform a cold start on its own, variables stored there remain safe. Additionally, you can use “mapp Recipe” to store data on the flash card.
Regards
Stephan
Maybe out of topic. I have never used a real application with a remanent or permanent variable. I always stored the PVs values into a data module. In my opinion, it is safer; you can easily do import and export of current values, etc. Also easy to share with other machine of the same types, etc.. Maybe a tip for you too.
this is to keep the memory of the axis position so we can resume after a power fail
