BillRobinson
Member
Last year I was involved in a mysterious project.
The project was adding another HMI computer to an existing network. The contractor bought cat 6 ethernet cable and ran it less that 20m from the PLC down the hall to the new computer. The cable was terminated by the contractor and verified by testing equipment to be properly terminated. No high EMF devices were in it's the path so it seemed like a simple run; however, communications were in-and-out. Pinging from the new machine verified this. The cat 6 cable was re-terminated and retested and still no change.
Communications was finally restored when we connected our Radio-shack cat 5e cables through the building internet terminal wiring. We connected through the building ethernet wiring because our radio-shack cables were too short.
After asking a networking guy we were told that cat 6 is too good for PLC networks that work under 1 GB transmission.
Anybody else here this? Any thoughts?
The project was adding another HMI computer to an existing network. The contractor bought cat 6 ethernet cable and ran it less that 20m from the PLC down the hall to the new computer. The cable was terminated by the contractor and verified by testing equipment to be properly terminated. No high EMF devices were in it's the path so it seemed like a simple run; however, communications were in-and-out. Pinging from the new machine verified this. The cat 6 cable was re-terminated and retested and still no change.
Communications was finally restored when we connected our Radio-shack cat 5e cables through the building internet terminal wiring. We connected through the building ethernet wiring because our radio-shack cables were too short.
After asking a networking guy we were told that cat 6 is too good for PLC networks that work under 1 GB transmission.
Anybody else here this? Any thoughts?
