Limitations of ethernet
Maximum span of 328 feet (100m)
Copper cable is susceptible to EMI
-Common sources:switching of large loads
-eg: motor starters,VFD,etc..
Ground faults can occur between equipment
-Occur when grounds are at different potentials.
-May be intermittent or life threatening
-Within a control panel use single-point grounds
No inherent protection from catastrophic events
-Lightning can propagate through copper cat5 cable