Communication problem between AC500 PM592 and CP651 after network failure
we are working on a system with 7 AC500 PM592 PLC´s and two CP651 panels. The panels and the PLC´s are communicating with the ABB CodeSys ETH protocol. We are having some issues with this solution. After a network problem some of the screens are unable to restore the communication with the PLC. In the CP600 logger we see this error for some tags:
read datagram failed - Error tag .xxxxxx not present in symbol file.
But the variables are present in the symbol file. After a restart of the panel everything is working fine again.
We configured the ABB CodeSys ETH protocol in the panel as 1 protocol with 7 slaves. This is because there are only 4 protocols available, so we are unable to give each PLC it's own protocol.