HMI's are obsolete and no source code is available, the PLC code is available,however the wiring has been cobbled for many years so the prints are not reliable. I have been in touch with Rockwells migration assistance group, and I want to switch to AB because it is our company standard, I do not stock MRO items for Siemens and Rockwell as big a pain as it is, is simply easier to train support people to use, has better tech support (most often) and in my opinion, for our applications (Automotive) works better.