Upgrading PM865 to PM891
We are planning to upgrade PM865 to PM891 due to overloaded system (95%) and cyclic (75%) loads. What should I consider before this upgrade and what information should I collect from existing system and provide to ABB for this upgrade.
You should consider that a PM865 is a high integrity controller and a PM891 is a normal proces automation controller so that upgrade will not work. There is or is comming a PM867 hi integrity which is a 133MHz against the 96MHz of the PM865. But the new controller will be version 6.x only.