makopa5
Member
We are currently running a PLC-5 system consisting of 12 PLCs with a lot of I/O per PLC and inter PLC comms and need to upgrade. What would you suggest is the best upgrade route: Control Logix or Siemens S7?
That is yet another discussion. Port the old code or start all over ?If the plant personal are familiar with the PLC5 code then the change to Contrologix will be minimal.
Very interesting. Didnt know that.The heart of our approach was the Allen-Bradley 1756-RIO module. It has a unique "Shadow Mode" that allows it to be connected to a RIO network and listen to both the Input and Output data on the network. Because of this, we were able to convert our PLC-5 ladder logic to ControlLogix code and compare the results of the ControlLogix program to the results of the PLC-5 program in realtime, while the PLC-5 remained in control.
That is yet another discussion. Port the old code or start all over ?
I say, start all over. If you port the old code, you will forgo some of the big advantages of doing the upgrade. Old PLCs are written in a totally different way to how you program new PLCs.
And that means again that it is not in itself an argument to stay with AB.
Just my opinion.