AC500 PLC on 800xA Bad Data Problem
We are currently using AC500 PLC with 800xA in our project. We use PLC Connect and CodeSys is added as OPC Generic Control Network( Cz of performing upload some problems/ made variables not connected etc.).
AC500 PLC is connected to network via 3G Modem, 3G connection is not really good. Tags are refreshed every 15-17 sec.
Problem is; sometimes 800xA see tags as "Bad Data". I use Matrikon OPC Explorer to check data quality in CodeSys; I can see the data quality is "Good" and tags are getting refreshed.
In PLC connect and OPC Network, data quality is "Bad". Restarting server does not work.
Is it something to do with using PLC connect and Generic OPC Server Network at the same time? Aborting one of these will take quite a lot time. ( PLC connect tags are only used in DataDirect and not used very often)
Since Matrikon OPC Explorer can see the variables, bad 3G connection should not be source of the problem.
I changed the some settings on OPC Configurator like timeout, buffer size. But it didn't work.
On the WorkPlace event logs, there are some errors:
"OPCDA Connect Failed, Failed to Connect OPC Server. The Server process could not be started because the configured identity is incorrect. Check the username and password."
But the problem has occured few times. This error only appeared one time for 2 hours.
Screenshot is attached.