IC693MDL633

IC693MDL633

IC693MDL633

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〖厦门光沃自动化设备有限公司 竭诚为您服务〗   
〖：欧工         〗
〖(同号)       〗
〖:  2479261344     〗
〖  
【价格】如此低价,* 
【货期】大量现货,下单后即可发货
【质量】*,进口***
【保障】产品经过专业检测，质保一年,15天包退换
【品牌】Allen-Bradley罗克韦尔、ABB、本特利Bently 3500系统卡件、GE、艾默生西屋等模块卡件
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用于温度测量的信号模块，考虑是热电阻还是热电偶。

　　信号模块是否需要在线带电插拔更换。如果需要，还需考虑附加特殊的背板插槽。

　　当系统和外部出现故障时，比如信号短路或锻炉，这时信号模块是否需要将输入输出信号自动切换到预先设置的安全值。如有要求，需考虑选用故障安全型的控制器和信号模块。

　　当需要和第三方设备通讯时，需考虑通讯距离的长短，以及相应的通讯接口协议等，选用不同的通讯模块。

　　针对系统中的重要连锁信号，是否需要特殊的SOE模块，来记录信号变化的时间先后顺序。

　　熟悉被控对象是设计控制系统的基础。只有深入了解被控对象以及被控过程，才能够提出合理科学的控制方案。

　　1）分析被控对象。详细分析被控对象的工艺流程，了解其工作特性。此阶段一定要与用户进行深入的沟通，确保分析得全面而准确。

　　2）画出工艺流程图。经过*步，应对被控对象的整个工艺流程有了深入的了解，为了更直观、简洁的表示，画出工艺流程图，为后面的系统设计做准备。

　　3）分析并明确控制任务。根据已经做好的工艺流程图，工程师可以把用户提出的控制要求转换为专业术语，对其逐一进行分解，并从控制的角度将其中的要求转化为多个控制回路。对于过程控制系统可用PID图来表示其中的控制关系。

　　PLC控制系统总体设计

　　在控制系统设计之前，需要对系统的方案进行论证。主要是对整个系统的可行性作一个预测性的估计。在此阶段一定要全面地考虑到设计和实施此系统将会遇到的各种问题。如果没有做过相关项目的经验，应当在实地仔细考察，并详细地论证设计此系统中的每一个步骤的可行性。特别是在硬件实施阶段中，稍有不慎，就会造成很大的麻烦，轻则系统不成功，重则会造成严重的人员和财产的损失。工程实施的过程中的阻碍，往往都是由于这一步没有做足工夫而导致的。

　　系统的总体设计关系到整个系统的总体构架，每个细节都必须经过反复斟酌。首先要能够满足用户提出的基本要求；其次是确保系统的可靠性，不可以经常出现故障，就算出现故障也不会造成大的损失；然后在经济性等方面予以考虑。

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