IC693MDL632
IC693MDL632
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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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根据被控对象的工艺流程、复杂程度和客户的技术要求确定系统的规模，可以分为大、中、小三种规模。确保硬件资源有一定裕量而不浪费。
小规模控制系统适用于单机或小规模生产过程，以顺序控制为主，信号多为开关量，且I/O点数较少（低于128点），精度和响应时间要求不高。一般选用S7-200就可达到控制要求
中等规模控制系统适用于复杂逻辑和闭环控制的生产过程，I/O点数较多（128点到512点之间），需要完成某些特殊功能，如PID控制等。一般选用S7-300等。
大规模控制系统适用于大规模过程控制、DCS系统和工厂自动化网络控制，I/O点数较多（高于512点），被控对象的工艺过程较复杂，对于精度和响应时间要求较高。应选用具有智能控制、高速通信、数据库、函数运算等功能的高档PLC，如S7-400等。
2）硬件配置
根据系统规模和客户的技术对控制系统I/O点数进行估算。分析被控对象工艺过程，统计系统I/O点数和I/O类型。按照设备和生产区域的不同进行划分，明确各个I/O点的位置和功能。再加上10%～20%的备用量列出详细的I/O点清单。
3）软件配置
根据控制系统设计要求选择适合的软件，包括系统平台软件、编程软件。
上位机监控软件的选择。首先需考虑监控的点数限制；是否有报警显示、趋势分析、报表打印以及历史记录功能。
4）控制功能
要正确的进行控制系统的规模选择，首先要了解各家控制器的特性，比如性能参数、应用场合、行业解决方案，以及可靠性和通用性等。如何选择一个控制系统，一般遵循以下几点：
控制系统是否需要冗余、I/O信号模块是否需要冗余、通讯是否需要冗余。
控制点数有多少，包括数字量输入和输出点数、模拟量输入和输出点数。
被控对象工艺是否复杂，是否需要实现特殊功能，比如防喘控制等。
系统正常运行时，控制器的负载率是否有足够的工作裕量；I/O信号点是否需要一定的余量。
针对数字信号，是否需要继电器隔离；考虑输入信号的电压和电流等级；输出信号是否需要固态继电器输出。
针对模拟量信号，是否需要安全隔离栅；信号的类型，电压型还是电流型；电压和电流的测量范围。不一样的信号类型，需要选择不一样的I/O信号模块。
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