Continuous online diagnostics in the field devices provide status of process and instrument health , enabling operations and maintenance personnel to recognize changes in status levels and take action to prevent issues before they occur 现场设备的连续在线诊断功能可以看到过程和机械正常程度的状态，使得操作和维护人员识别状态程度的变化，从而在异常事故发生前采取预防措施。
In such a case , the software architect may decide to associate a web service with this role to take advantage of a possible reduction in the operational or maintenance costs of an application , or to improve the flexibility of choice associated with available implementations of a given business process 在这种情况下，软件设计师可以决定把web服务和这个角色联系起来，这样可以减少操作和维护应用程序的开支，或者提高选择给定的商业进程的可用实现的灵活性。
Please ensure that this operating instructions , the operating instructions of the ozat ? ozone generator , the operating instructions of the air dryer and the operating instructions of the pump are carefully read by all relevant persons before installation and before putting into operation , to ensure the safe use of the ozat ? ozone system ( from here on also referred to as the equipment ) the operating instructions contain important information for the operation and maintenance of the equipment 在安装和使用之前，必须确保有关的人员仔细阅读相关操作说明书，包括空气干燥器和泵的操作说明书，以确保安全使用臭氧发生器系统，操作说明书包含有重要的操作和维护信息。
( 1 ) aiming at the character of the cucumber diseases and insect pests diagnosis , database - based rules and other information - base arc designed in this paper . the rule - base with such structure is the result of simulating the information storage and activation of brain information . operation simple and maintenance easy arc the advantage of the rule - base with such structure ( 1 )针对黄瓜病虫害诊断的特点，本研究设计了基于数据库的规则库和其它的信息库，在规则库的建设中，用多维数据表来模仿了人脑信息的存贮与激活方式，以这种方式建立的规则库适合蔬菜病虫害诊断知识的特点，具有实用性强、操作和维护简单的特点。
At the same time , it also illustrates the superiority of this kind of communication by introducing the profibus field bus . take the transformation of focke packaging machine as an example , the main content is as follows : 1st , to analyze the plc control system of s5 series , and determine the concrete functions that the new plc control system hopes to achieve as well as how to achieve the goal through studying the work program of the original one ; 2nd , to demonstrate the advantage of the field bus in the process of digital alternation by introducing the principle agreement of field bus profibus ; 3rd , to achieve each function of the original control system through using siemens ' s plc control system in the design of hardware and step 7 in the software as well as designing and compiling control system of focke packaging machine ; 4th , to use fm455 for controlling temperature not only can meet the system ’ s severe request for temperature and efficiently avoid many demerits of the temperature control instrument but also can bring convenience for operation and maintenance ; 5th , to use the intouch configuration software to compile monitor and control program can accomplish the goal for real - time surveillance and control of the production line , while setting some parameters can provide a powerful alarming function 以改造focke包装机为例,主要内容如下: 1 、通过熟悉原有控制系统的工作流程,分析了原s5系列可编程逻辑控制器的控制系统,确定新的可编程逻辑控制器控制系统需要实现的具体功能以及其实现方法; 2 、在本系统数据交互中,通过介绍profibus现场总线原理协议,论述了现场总线在工业通讯中的优点; 3 、下位机硬件设计上使用西门子可编程逻辑控制器控制系统,软件平台采用西门子step7 ,设计和编制了focke包装机控制软件,实现了原有控制系统的各项功能; 4 、本系统对温度要求严格,采用温控仪表控制温度不能满足系统要求,而且温控仪表操作和维护都不方便,因此采用fm455温度控制模块进行温度控制,满足了系统对温度的要求,同时又有效地避免了温控仪表在操作和维护上的缺陷; 5 、在监控系统上,使用intouch组态软件设计了系统的监控界面,从而实现了对生产线的实时监控,并且可以通过界面设置系统的一些参数,同时提供了较强大的报警功能。
