Connection Error

[nievesdelimon]

Hi,



I'm currently working in a small cell, the IP addresses have been set, PLC firmware has been updated and program downloaded, however, most devices on the IO tree have a warning sign and display a 16#0204 Connection Request Error: Connection request timed out. What could be causing this?

 

[passwordg]

Screenshots ?

 

[Ken Roach]

Either they're not properly connected to the Ethernet switch, or the IP addresses aren't really configured correctly, or there's something in the network (a router, or a VLAN) that is preventing them from connecting to one another.

Since you mentioned error 16#0204, I assume this is an A-B ControlLogix system.

Start with your engineering workstation, browsing the devices in RSLinx Classic. Anything that doesn't show up in the browse, you go troubleshooting with PING and TCPING and a web browser.

Post as much detail and context as you can. If you have screenshots, reduce them to a smaller size and save as *.PNG, then attach them to your post.

 

[nievesdelimon]

Hi, I can PING both ethernet switches (Hirschmann), however, the fault persists. I attached a screenshot.

 

[arpus4KM]

you've got a lot of connection errors..... unplug a few things and plug directly into it so you know you don't have duplicate IPs.

also, you can just ping the one you want, run a ping xxx.xxx.xxx.xxx -t, and then unplug one, look for an interruption followed by resumed ping reply, or no interruption at all....

 

[nievesdelimon]

Thanks. I tried that and realized there were devices plugged to the wrong ports and also, there are connections physically missing.