I'm looking into buying RSLogi5000 software so I can work on Control Logix PLCs. The cheapest version is about $3500 and it's version 16. My question is, they seem to be changing the version almost every year. If I get version 16, will I need to purchase again version 17 & spend another $3500? or does Rockwell allow you to upgrade for free? Also, when I buy version 16, am I able to work on processors that have lower version(15, 12, etc) installed in them? or do I need to spend more money and buy those versions also?
TIA
TIA