單片機畢業(yè)外文翻譯-文庫吧資料
2025-01-22 11:06本頁面
【正文】 .Says Larry Komarek: Right now, MAP is still a moving target for the manufacturers, a specification that is not final .Presently, for example. people are introducing products to meet the . products will be obsolete when the new standard for is introduced.Because of this, many PLC vendors are holding off on full MAP implementations. Omron, for example, has an ongoing MAPpatibility program。t justify DCS[distributed control system].With the starting price tags of chose products being relatively high, a programmable controller makes sense for small, low loop count application .The second is where you have to integrate the loop closely with the sequential logical .Batch controllers are prime example ,where the sequence and maintaining the process variable are intertwined so closely that the benefits of having a programmable controller to do the sequential logical outweighs some of the disadvantages of not having a distributed control system.Bill Barkovitz, president of Triconex, predicts that all future controllers that e out in the process control system business will embrace a lot of more PLC technology and a lot more PLC functionality than they ever did before.Communications and MAPCommunications are vital to an individual automation cell and to be automated factory as a whole. We39。re appropriate. one, he says, is where the size of the process control system that39。is that PLCs will be used in the process industry but not necessarily for process control.Several vendors obviously betting that the opposite will happen have introduced PLCs optimized for process application .Rich Ryan, manger, mercial marketing, Allenbradley Programmable Controls Div., cites PLCs39。s increasing interest in languages like C and BASIC.PLCs in process controlThus far, PLCs have not been used extensively for continuous process control .Will this continue? The feeling that I39。 Programmable controls are being used for more and more sophisticated operations, languages other than ladder logic bee more practical, efficient, and powerful. For example, it39。 general manager, Siemens Energy amp。 it is unnecessary to make distinction between RAM and processor register as is done in the case of a microprocessor system since RAM and registers are not usually physically separated in a microputer.Central processing unit (CPU)The CPU is much like that of any microprocessor. Many applications of microputers and microcontrollers involve the handling of binarycoded decimal (BCD) data (for numerical displays, for example) ,hence it is mon to find that the CPU is well adapted to handling this type of data .It is also mon to find good facilities for testing, setting and resetting individual bits of memory or I/O since many controller applications involve the turning on and off of single output lines or the reading the single line. These lines are readily interfaced to twostate devices such as switches, thermostats, solidstate relays, valves, motor, etc.Parallel input/outputParallel input and output schemes vary somewhat in different microputer。piggyback39。外文資料翻譯The singlechip microputer is the culmination of both the development of the digital puter and the integrated circuit argua
環(huán)評公示相關(guān)推薦
鄂ICP備17016276號-1