BENTLY 60M100-00 PLC中央处理器 欧美

BENTLY 60M100-00  网络通信模件

60M100-00目前中国很多流程工业企业已经大量使用DCS系统提高生产的自动化，但是因为在初期规划中缺少经验等历史原因，DCS系统的品牌、型号等往往比较混乱，没有形成统一规划，造成大量异构的DCS系统。DCS系统均具备报警模块，但不同品牌DCS的报警模块并不具备互相通信的功能，报警模型也各不相同，统一管理成为异构DCS系统的一个大难题。同一个企业，报警系统形成多个孤立的区块，分散成多个信息孤岛，人机界面无法统一，也无法对报警信息进行更深一步的挖掘和应用，只能应用于基层的现场，对管理层形成了信息上的屏蔽，带来很大的管理不便 DCS系统的应用，使报警的设置非常方便，非常廉价，但方便和廉价也带来了相应的问题——报警设置的随意性。在很多企业，当前的问题 是报警不足，而是报警过量和报警不当，而大量和低效的报警给企业生产带来了巨大的潜在风险，不仅会降低生产利润，60M100-00更有可能造成生命和财产的巨大损失。 BENTLY 60M100-00  网络通信模件 1994年，英国Milford港的Texaco炼油厂发生爆炸起火事故，在发生爆炸前的11分钟内，系统产生了275个报警，而这275个报警仅仅有两个处理人员进行处理，而两个工作人员根本无法在众多的报警当中辨识出真正有意义的信息，结果导致了悲剧的产生。  DCS报警设置数量不合理、优先级配置不当、参数配置不当、无法识别和阻止报警洪水等问题，60M100-00是当前DCS系统报警普遍存在的问题。梯形图逻辑（LAD），是PLC使用得多的图形编程语言。60M100-00 它是从继电器逻辑电路图演变而来。梯形图逻辑是在常用的继电器与接触器逻辑控制基础上简化了符号演变而来的，具有形象、直观、实用等特点。功能块图（FBD）是另一种图形编程语言，可用于包括PLC和分布式控制系统（DCS）在内的一些控制器。它使用不同类型的块（例如与、或、比较、数学计算、计时器和计数器），来描述输入和输出变量之间的功能。输入从设备或其它模块的输出馈入一个模块；输出将数据传送到下一个块或变量结构化文本（ST）是一种类似于计算机语言（例如Pascal）的高级语言。ST语言中的表达式由运算符和操作数组成。操作数可以是常量、变量、函数调用或另一个表达式。表达式的计算通过执行具有不同优先级的运算符完成。有高优先级的运算符先被执行，然后依次执行下一个优先级的运算符，直到所有的运算符被处理完。60M100-00 有相同优先级的运算符按从左到右的顺序执行。

BENTLY 60M100-00  网络通信模件

60M100-00 At present, many process industrial enterprises in China have used DCS to improve the automation of production. However, due to historical reasons such as lack of experience in the initial planning, the brands and models of DCS systems are often confused, and unified planning has not been formed, resulting in a large number of heterogeneous DCS systems. All DCS systems have alarm modules, but the alarm modules of different brands of DCS do not have the function of mutual communication, and the alarm models are also different, so unified management has become a big problem for heterogeneous DCS systems. In the same enterprise, the alarm system forms a number of isolated blocks, which are scattered into a number of information islands, so the man-machine interface can not be unified, and the alarm information can not be further excavated and applied. It can only be applied to the grass-roots site, which shields the management from information and brings great management inconvenience to the application of DCS system, which makes the alarm setting very convenient and cheap, but the convenience and cheapness also bring the corresponding problem-the randomness of alarm setting. In many enterprises, the current problem is insufficient alarm, but excessive alarm and improper alarm. A large number of inefficient alarms bring huge potential risks to the production of enterprises, which will not only reduce the production profit, but also cause huge losses of life and property. In 1994, an explosion and fire accident occurred in Texaco refinery in Milford Port, England. In the 11 minutes before the explosion, the system generated 275 alarms, and these 275 alarms were handled by only two handlers, but the two handlers could not identify the really meaningful information from the numerous alarms, which led to the tragedy. Problems such as unreasonable number of DCS alarm settings, improper priority configuration, improper parameter configuration, and inability to identify and prevent alarm floods are common problems in DCS alarm system at present. Ladder logic (LAD) is a graphic programming language used by PLC. 60M100-00 It evolved from relay logic circuit diagram. Ladder diagram logic is evolved by simplifying symbols on the basis of common relay and contactor logic control, and has the characteristics of image, intuition and practicality. Function block diagram (FBD) is another graphic programming language, which can be used in some controllers including PLC and distributed control system (DCS). It uses different types of blocks (such as AND, OR, comparison, mathematical calculation, timer and counter) to describe the functions between input and output variables. Input is fed into a module from the output of equipment or other modules; Output structured text (ST) that transfers data to the next block or variable is a high-level language similar to computer language (such as Pascal). Expressions in ST language are composed of operators and operands. Operands can be constants, variables, function calls, or another expression. The expression is evaluated by executing operators with different priorities. Operators with high priority are executed first, and then the operators with the next priority are executed in turn until all operators are processed. 60M100-00 Operators with the same priority are executed from left to right.