1756-L85E Kicks HMI and Laptop off network

[aricard60]

I have a brand new AB 1756-L85E, running version 33, that sporadically bumps the programming laptop and the HMI from communicating with it. After being disconnected we cannot re-establish communication, without a power cycle of the PLC. Pings still work to the PLC, and the node is visible in RSLinx classic and FactoryTalk Linx.

Currently we’re using the Ethernet port on the front of the PLC to communicate on our local network. This local network has 96 nodes, mainly power flex 525s, that do not seem to be effected when this happens….

Anyone experienced something like this before?

Thanks!

 

[baref00t25]

I've seen this before when the PLC is over loaded on communications. If you type the IP address into a web browser you can see the diagnostics of the communication.

 

[aricard60]

When we try to browse to the IP (google chrome, windows edge, and IE) it just says “waiting” and never connects to the PLCs web server.

 

[JeremyM]

The web server is disabled by default. You need to enable it in the controller properties or by message.