By Michael P Lukas
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Additional info for Distributed Control System:Their evaluation and design
The number of,function blocks) permitted. per LCU. Other aspects of evaluating function blocks and selecting control languages will be discussed in Chapter 3. 4. 1 describes the basic elements of all microprocessor-based local control units, the current offerings of controllers in the marketplace exhibit endless variations on this structure. The controllers differ in size. I/O capability. range of functions provided. and other architectural parameters depending on the application and the vendor who dc\igncd the equipment.
OOOdoubl00ns:~itimplements up to ten c ontinuous function blocks, and . no redundancy cost per-function , is required. symptotic. 7. In the case of configuration B, the cost of LCU B 1 includi 19 the effect of redundancy is 5,000 + (5,OOWS) = 5,625 doubloons, be cause every eight LCUs must bebacked up by another LCU. Since LC J B 1 implements up to 40 contiri1J,OUS function blocks, its characteristic c ost per function· block is (5,625/ 40)'=:'141. This is the asymptotic: value tha: the cost curve for configuration .
LJtani. \1 .. and Smith. LE .. ing Micro-Electronic.. in Single-Loop-Controller.... erenf'r Control Engineering. Barnngton, IL. 1tm4. Control Engineering. pp. 23~243. IJ Salim. A .. and Eckstein. E" "The Function Processor-c-An Advanced Enhancement for High-Performance Sinp'e-Loop Control:' 15A Transactions, vol. 23. no. J. 1984. pp. I-I~. p.. ' Computer, vol. t:!. no. 9. September 1979. pp. 92-98. 211> Faerber. G .. "Statu... of Hardware and Software for \1icfocompulers. "in [)i!? -\pplicot;mu to Process Control.