Chapter 11Distributed Control I: Net Basics
Control activities can be distributed across several computers for several reasons— the most common is to match the geographic distribution of the control object. In this case, wiring to instruments and actuators is reduced by placing the control computer close to them. Only network wiring is then needed to connect the control node to the rest of the control system. This arrangement can be a major cost saver in a complex system. Probably the next most likely reason to distribute control is when latency requirements for several tasks cannot be met with a processor of reasonable cost. Each of these tasks can be placed in a processor in which it is the highest priority, thereby meeting all of the latency ...
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