I have had this problem with many different HMI programs. I have my PLC and HMI communicating without any problem. I will make a change to the PLC offline and then download to the PLC. I import the tag database to the HMI. Once I go back online with the PLC, I get the “Device No Response” message on the screen. The only edits I have made were program based.
My two questions:
How do I prevent this from happening?
How do I fix the problem when it happens. The only method I have found the fixes the problem is redownloading to the HMI with the PLC online. However this is not a very solid solution. Is there certain parameters I can change to fix/prevent this problem?
When you make program based changes in your PLC the tag names may change or get out of sync. Therefore the “Device No Response” message may show up if the tag doesn’t exist or a modification to the tag has been made. Therefore after each change to your plc program we recommend that you:
Export tag database from your PLC
Import the new tag database within the HMI project.
When this happened to me before, I never had to import the new tag database into the HMI project, so I know the ag database is not out of sync. All i had to do was redownload the same HMI project with no changes.
I was hoping there was a better solution other than redownloading?
I wasn’t able to replicate the error as you described. What specific modification were you trying to make and what version of EasyBuilder Pro are you using as well?
Just adding or modifying rungs in ladder logic. No updates to the tag data base. All very simple edits. I am using version 6.09.02. I connect to the processor over ethernet IP