1752-L24BBBE罗克韦尔allen-bradley原装正品
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★公司全称:
厦门泰尼电气有限公司
◆品牌热点\AB\ABB\施耐德\GE\西门子\发那科\FOXBORO\西屋
价格好++++++++贸+++++++++++++疯狂降价
货期短+++++++++++++++++++渠道好
产品好+++++++++易++++++++++原装进口
数量多+++++++++++++++++++++大量库存停产备件
售后服务好+++++++商++++++++++++质量保证
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被控对象的分析与描述
分析被控对象就是要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,确保分析的全面而准确。在控制系统设计时,往往需要达到一些特定的指标和要求,即满足实际应用或是客户需求。在分析被控对象时,必须考虑这些指标和要求。在全面的分析之后,就需要按照一定的原则,准确地用工程化的方法描述被控对象,为控制系统设计打好基础。
1)系统规模
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。
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