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Hi All, I recently had an opportunity to visit a plant that was running GE90-70 redundant PLCs with Genius RIOs communication to CImiplicity SCADA. I initially thought that the Application was done in PME 7.0 and was able to use the serial cable and upload the project using PME software. The program uploaded with no comments. However, when i went to get the backup of the SCADA program, I saw that the previous engineer made back ups of both the SCADA and PLC. When i looked at the PLC files, It struck me that the PLC application was made in LM90. I had the LM90 master software and was able to open the files using a few youtube videos as a guide. The client has asked me add a few PID loops. I have a few questions: 1. If the PLC was loaded with LM90, how was i able to  upload the program with PME?.          1a. If so, can I make online changes with PME to add the 3 PID loops without going back to LM90 2. If 1a option is not possible, I would have to use LM90 to make the changes. does LM90allow online changes? LM90: Questions I have plenty experience with PME, but this would be my first time with LM90. Before going to a site i would like test the process of upload, download in my office. So i have few queries about this software: 1. I am able to get hands on GE 90-70 PLC that was programmed with PME. Will i be able to create new application with few logic in LM90 and download to this PLC and test the whole process of testing my logic and upload/download procedure. And when once i am done, load the PME application back into it. I am not sure if I would have downgrade the firmware of the PLC? 2. , Does LM90 have option to make offline changes and download only changes, if so will it stop the PLC when downloading?. I would appreciate all the help in this matter