EtherNet technology in variable frequency drive
EtherNet technology is the major wave of current technologies, with several Protocol Flavors from which to choose. I also believe the Dual Port is the correct way to go, with integral switches as the same or next step. EtherCat is inherently self-healing, like EIP uses standard RJ-45 yet no switch is required, to create a network, just loop in to out, while DLR (to be delivered) requires configuration, yet all the technologies are headed in a like direction. I prefer ECat in that you can inherently close Microsecond loops.
It is essential in today's market for the VFD to be capable of communicating (if possible even at the same time) using different communication protocols over different port types. That being said, while it is "easy" to bypass this need by adding a protocol converter or a serial/ethernet converter (for those units that only come with serial ports), it is still an added point of failure in the integrated system.
However, the importance and need of serial ports in the VFD is still highly valued, especially when we consider the need for integration with other field instruments. I would like to see VFD manufacturers begin adding some PLC functionality also so that we can remove the need for additional devices per installation.
It is essential in today's market for the VFD to be capable of communicating (if possible even at the same time) using different communication protocols over different port types. That being said, while it is "easy" to bypass this need by adding a protocol converter or a serial/ethernet converter (for those units that only come with serial ports), it is still an added point of failure in the integrated system.
However, the importance and need of serial ports in the VFD is still highly valued, especially when we consider the need for integration with other field instruments. I would like to see VFD manufacturers begin adding some PLC functionality also so that we can remove the need for additional devices per installation.
