I have two customers with relatively large 405 systems. One of them is going to need some program changes very soon in order to add two more remote (radio based) RTU systems. In order to do this and end up with a clean and organized result I am going to have to shuffle a bunch of things around in the code. It would be awesome to be able to migrate the CPU to a Do-More and let the migration wizard handle a lot of that work for me.
Someone mentioned the SLC platform We have dozens and dozens of SLC systems we support. The I/O is getting expensive and the CPU pricing has become downright criminal. Also, the full (Standard) version of RSLogix 500 required to program that series has jumped from $2380 to around $3500. We frequently pick up new customers with SLCs and one thing we always offer is setting them up with their own software license (and we never mark up the costs of software).
If there was a CPU we could plug into a SLC rack that could take over the existing extensive I/O and work with free software, you would probably need to double your manufacturing before you announced its availability. Many of the old SLCs we come across are 5/04 CPUs with a DH+ port connected to an obsolete PanelView Standard. When they want us to update the failing HMI it is almost always $5k just for parts to get started so we can swap to a refurb. 5/05 (Ethernet). A brand new 1747-L551 SLC 5/05 CPU with 16K of memory lists at $9,839.21 right now from my supplier (who doesn't give us very good price breaks for Rockwell gear because we are a small fish in his big pond).
That is about 4 times what they cost a couple of years ago.
I am already pretty much convinced that your existing products will replace our go to controller: Micrologix 1400. We use a lot of them on small systems with serial and ethernet radio modems. If your firmware were updated to include a DF1 Radio Modem protocol for the serial port and/or Ethernet DF1/PCCC, I would switch right now because I could integrate them into existing systems and make the radio masters think they were talking to other SLCs or Micrologix. This would save money and panel space as well as provide for a much more flexible and capable end product.