EtherNet/IP, Profinet and Modbus TCP/IP comprise 80% of most used industrial Ethernet variants worldwide, according to a study from IMS Research (www.imsresearch.com). EtherNet/IP accounts for 30% of market share, while Profinet has 28% and Modbus commands 22%, according to "The World Market for Industrial Ethernet—2009 Edition."

Ethernet-Powerlink and EtherCat are estimated to have market shares of 11% and 4%, respectively. Among the top three, Profinet is forecasted to grow the most between 2008 and 2013, with an estimated increase of almost 9%. EtherNet/IP's growth over the same period will be slightly more than 7%, and Modbus TCP/IP is expected to decline by 0.4%, according to IMS Research.

Variety is the spice of buses

Eighty percent of the world’s industrial Ethernet variants are
either EtherNet/IP, Profinet or Modbus TCP/IP.
Source: IMS Research