My facility has a DO-More H2-DM1E controlling 6 GS2 and GS3 VFDs over ethernet over unmanaged switches and GS-EDRV100s. The switches are SE-SW8U, 8 port automation direct switches that are linked together with an ethernet jumper. The DO-More is also linked with ethernet to 3 C-Mores around the plant over the same unmanaged switches.
Every two or three months the DO-More will stop being able to control the VFDs and the GS-EDRV100s will stop showing good communication. The PLC will still communicate with the C-Mores. But the VFDs will not respond to commands from the PLC. To get the VFDs back online we have been power cycling the PLC. This has been going on for over 4 years.
The errors on the CPU are:
Network stack resource allocation failed - $CommStackOverrn (ST146)
One or more user network devices was forcibly purged to free network resources - $QueuesFlushed (ST145)
Any ideas what could be the root cause?
Topic: H2-DM1E Communication Issue (Read 16 times)