So the Knowledgebase has a bunch of articles about that error happening upon other events (like going online, importing L5K, etc.) but not yours. I opened one of them and it gives a few solutions. They seem to refer to v20 a lot, so it may be a good idea to make sure you're running the latest minor revision of v20.
There's another article that specifically refers to the error when opening a specific project file but was linked to as a general fix for other situations (access level: TechConnect)
Solutions:
1: Hold SHIFT and CTRL when starting RSLogix (this restores all settings to factory default)
2: Export ACD to L5K and then import it back into a new project
3: Check KB article linked in steps 2a-2f above
Lots of circular links where their articles refer to each other, so I may have some links crossed. Basically, I'd first upgrade to the latest minor rev of v20 before doing anything else. If that doesn't work, or if you're already there, try the repair installation, then Delete Harmony files. The rest of the "fixes" seem to be really long shots to me....
Pturmel would be correct. Try just creating a new file of version 20 for a different controller and see if you get that error. I have a win 7 32 bit when creating a file in RSLogix 5000 selecting version 16 for any cpu controller gives me the same error and crashes my whole rslogix 5000 program. Come to find out it is a 32, 64 bit thing with the OS.
You're already at the latest firmware version for the CPU. What minor version of RSLogix v20 are you running? That matters too. I'm running 20.04 but it's been a while since I needed that version. The latest is 20.05. If you're not sure, open the project and go to Help -> About RSLogix 5000 and it will tell you your version. I would also seriously consider @Otto Automation's suggestion of "down"-grading to v19. Version 20 has always been a....problem child.
The software version has to match the hardware version, so if you go to version 19 software you will need to go to version 19 for the hardware, note when you do the firmware change on the processor it will wipe out the existing program in the PLC.
alan_505 is correct. Sorry I should have mentioned that. By looking at your screen shot, it does not look like version 19 is available for the cpu. I assumed you already had it in control flash. Do you have any other firmware revisions in control flash for that controller?
When I go to the downloads page, it shows that firmware 19.015 works for the 1769-L32E, both series A and B. You would need that firmware and v19.01.01 of RSLogix. I'm not sure why your screenshot shows the red X there.
I created an empty project with the 1769-L32E at v20 and tried to change it to v19 but it wouldn't let me downgrade. I was able to create a new project at v19.01.00 (the version I have installed). You may have to do that and manually build the I/O Configuration and copy/paste or export/import the program.
To get the firmware, go to their download center:
Click "Downloads by Product"
Type in the model number in the "Search" window. Click on it, select your series (A or B) and click on version 19.015. Click the red "Downloads" button and it'll take you to a page where you can select files or choose firmware only. You'll have a "Downloads" cart icon at the top that you can click to start the download.
Rockwell has been phasing out older versions of firmware for some reason. They have been doing it for a while now. If you can not get any version of 19 from Rockwells website, then version 17.012 that is in your control flash would be fine. You would just have to have version 17 of rslogix. Version 17 sometimes does not play well with win 7, but I think you said you were using win 10. Joe E...Do you know if the version 17.012 he already has in control flash would work for that controller? I am not in a spot to look it up right now.
It looks like both 17.005 and 17.012 will work with Series A. Version 17.012 also works with Series B. That's just what it look like I can download from the website. I didn't try to actually download, but found them in the list.
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