jcraft
Member
We currently have a GE 90-30 rack with a CPU363 processor and a CMM321. The machine also has a pc running a Cimplicity HMI to communicate with the PLC via a network switch inside the control cabinet. Everything has been in place and working fine for years. Recently we wanted to add this machine to our computer network so we can monitor the PLC program from our office building or offsite. We ran an Ethernet cable from our facility network switch to the switch in the cabinet. I also changed the IP addresses on the machine so it would communicate with our network. Now the problem, I can connect up with the PLC remotely via our network however, communication drops off and reconnects every 20 seconds or so. When I do a ping coomand to the PLC it shows 4 data packets sent out and only 2 received with a 30% loss of data. I have ruled out the Ethernet cable entirely because we put a piece of equipment at the machine and hooked up to the Ethernet cable and I can ping this quipment perfectly with no data loss and it has been working for weeks now on this cable with no issues. Any ideas what would cause this. Thanks