2/5/2004 - A recent study by Venture Development Corporation identifies the top 5 control network interfaces for use in industrial distributed/remote I/O applications.
|For All DCS, PC-Based and PLC Product Classes Combined|
|2002||Expected in 2005|
|1. Profibus DP||1. Profibus DP|
|2. Ethernet (10 mbps)||2. Ethernet (10 mbps)|
|3. DeviceNet||3. DeviceNet|
|4. AB Remote I/O (tied)||4. Foundation Fieldbus H1|
|5. Foundation Fieldbus H1 (tied)||5. Fast Ethernet (100 mbps)|
Although Profibus DP is expected account for the largest share of shipments for distributed/remote I/O, Ethernet-based network connectivity is projected to contribute the most to market growth over the forecast period.
However, Ethernet by itself is not a complete network and in particular requires an application layer protocol, of which there are many presently in use.
Which Ethernet protocol or protocols a vendor chooses continues to be at the discretion of the vendor, as there is no clear frontrunner. By waiting to see which protocols find the widest acceptance, a vendor may get into the market too late. The better approach may be to develop products for those perceived as showing good potential such as Ethernet/IP, Modbus TCP and ProfiNet.
All vendors should develop distributed/remote I/O products that interface with open bus/network protocols, as demand for use with proprietary protocols continues to fall.
Founded in 1971, VDC is a technology market research and consulting firm that specializes in industrial and commercial electronics, computing, communications, software and power systems markets.
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