- January 14, 2018 at 10:32 pm #1048
Hey Fellas. It’s good to join. Hopefully I’ll be able to learn a lot from the site. I have a question about RSLinx. When I open it, it gives an error that says “Failed to show RSWho, can’t access the harmony.rsh file”. The file is in the proper location under rscommon. I’ve tried uninstalling and reinstalling RSLinx with no luck. Any suggestions?January 15, 2018 at 8:01 am #1049
Hi James and welcome to the Forum!
The first thing you want to make sure is that RSLinx is compatible with the Operating System you are using. Refer to the Product Compatibility and Download Center to check compatibility.
You can try deleting the harmony files so they are recreated upon launching, try this:
Close all software including RSLinx Classic. If RSLinx is running as a service, switch to run as an application.
Open Windows Explorer and go to
For 32 bit Systems, C:\Program Files\Rockwell Software\RSCommon
For 64 bit Systems, C:\Program Files (x86)\Rockwell Software\RSCommon
Delete Harmony.hrc and Harmony.rsh (you may have Harmony instead of Harmony.rsh). Do not delete HRMYUI.DLL
If you cannot delete the Harmony files, stop the Harmony service at Start–>Control Panel –>Administrative tools –> Services or reboot your computer
If you have a Windows 64 bit system you may only have 1 harmony file.
Change it back to run as a service, and restart the computer if necessary.
If this doesn’t work let us know and provide more info on RSLinx version, OS version etc.January 15, 2018 at 9:51 pm #1064
I tried to delete the harmony file to no avail. I did some more research and found that a Windows update is what was the problem. I had to go to “Programs and Features” and then to “View Installed Updates”. Find the update with the number (KB4056829) and uninstall it, then restart the computer. Everything came right up just fine afterwards. Thank you PLC Guru for your support, and maybe this will be helpful to others if the problem occurs to them.January 15, 2018 at 10:14 pm #1065
Absolutely James! And we’re happy to have you on board here at PLCGurus.NET. Look out for the new video series we are working on that will allow you to develop your own SCADA/HMI applications using Visual Studio and C# via direct access to a ControlLogix or similar PLC…(without the need for RSLinx or other OPC Server software). It’s going to be awesome!January 16, 2018 at 1:20 pm #1077
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Also new here. Thank you James for posting this…I was completely stuck. I had the same problem as you did and reinstalling RSLinx, deleting harmony.rsh files, etc. didn’t solve it. Uninstalling that Windows update was what took care of it. I’ve sent in a feedback posting to Microsoft on the Feedback app…which probably amounts to blowing on an oil rig fire.January 16, 2018 at 1:30 pm #1078
LOL…I needed a good laugh today…thanks Christopher!January 17, 2018 at 1:26 pm #1094
No problem Christopher Kemmann. Glad it helped.January 26, 2018 at 1:21 pm #1259
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uninstalling KB4056892 is sufficient for me. This is the patch for Spectre-Metldown