Rules for Open Systems
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Everyone in the industrial automation seems to be waiting for “fieldbus” - the bi-directional communications protocol used to connect field-level instruments and controls. The IEC/ISA SP-50 international fieldbus specifications are still under development, with strong demands from major users and support (at least lip-service) from most of the instrument vendors. But the standard will never emerge - and here is why.
Vendors want proprietary differentiation, which generates higher margins. Technology development is expensive and everyone understands the financial rules for expense amortization or write-off. Once the status of a standard is achieved (through technology and/or marketing leadership, or timing) other vendors will simply be required to conform - giving the clear advantage to the owner, or consortium, that controls the standard.
Everyone recognizes that Allen-Bradley (Rockwell) had the developers advantage when they made DeviceNet (and then ControlNet) "open". It is abundantly clear to all the members of the Open DeviceNet Vendors Association (ODVA) that the vast majority of sales of DeviceNet products are from A-B. Other "followers" of the standard, like Cutler-Hammer (who hired one of the original A-B developers of DeviceNet) had hoped to wrest leadership away from A-B through enhancing the standard. But, they simply poured their development and marketing dollars away till they recognized the futility of the exercise. It is almost impossible to unseat a market-leader through following.
The A-B strategy in making DeviceNet "open" follows a combination of all three of the rules. They allowed other vendors to purchase or license their hardware, software and firmware (rule 1); they expanded involvement through gaining a bunch of followers, all eager to find new ways of connecting to the vast A-B installed base of PLCs and controls (rule 2); and, A-B was combating the encroachment of Profibus DP and Interbus into their US backyard (rule 3).
Some think that there is another rule - submitting to user demands. The story goes that General Motors demanded that A-B make ControlNet "open" before they would use it. And A-B did just that - they made it "open" - and allowed GM to think that they were acquiescing to their demand. But, A-B was simply following the 3 rules, as they did for DeviceNet. To use ControlNet, you almost certainly need to purchase A-B ASICs and toolkits. Sure you can buy something vaguely similar from SST or other hotshot developers, but that is simply paying A-B through the backdoor (Rule 2).
There are several similar examples in the vast growth of the PC business - Unix and Windows; PC/AT bus and IBM PS/2; Novell and NT networks; EtherNet and ARCnet. Remember WordStar and then WordPerfect playing a losing battle against Microsoft Word and Excel? Well now, Scott McNealy has announced that Sun will be giving away their office suite to combat the entrenchment of Microsoft Office. Would you like to bet who will win that marketing battle?
For your homework - see if you can trace which of the 3 rules are being used in each of the marketing battles in your own business. To lighten your burden, someone can perhaps give us a tune for this little ditty:
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