140DDO35300 140DDO35300 140DDO35300 140DDO35300 140DDO35300 140DDO35300 140DDO35300
140DDO35300 140DDO35300 140DDO35300 140DDO35300 140DDO35300 140DDO35300 140DDO35300
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直流屏PLC监控的选型原则
直流屏PLC监控系统以运行稳定、性价比高的特点铸就了在该产品行业里的楷模，在各大工程项目里有很多优先选择PLC监控系统。至于充电模块，在此类工程项目里用得最多的就是艾默生HD系列的了。
直流屏要用PLC监控系统，首先要确定用哪个牌子的PLC。在这里，可以很负责的告诉大家，西门子S7-200PLC是各大设计院和工程项目单位的首选，因为西门子S7-200PLC已经成功应用于该行业10年有余，且国内有多家直流屏企业在不断完善S7-200PLC监控系统。至于其他品牌的PLC，比如说三菱FX系列、无锡信捷XC5系列PLC等，也有厂家在制作并完善，但是这几款PLC在行业里用的少，维护成本高（当监控有问题时，只能找原厂家，形成了行业垄断）。
直流屏监控系统确定选用S7-200系列PLC后，就要确定该监控系统所要实现的功能。因为PLC监控系统成本要比南方厂家做的单片机系统成本要高，多一个功能可能要多一个PLC模拟量模块或者是数字量模块。所以要精打细算，用最低的成本实现基本的监控需求。
直流屏的几种选配方案：
1、监控系统功能要求：5.7寸触摸屏显示，检测2路交流电源电压、控母电压、合母电压、电池组电压、正负对地电压、负载电流、电池组充放电电流、18路电池巡检、支路馈出接地阻值及系统内部开关量、馈出开关量检测。
按照上述要求，硬件配置为5.7寸触摸屏、S7-200-CPU224PLC、PLC扩展模块EM2311块、PLC扩展EM221一块、传感器N只、PLC及HMI工作电源1块、电池巡检模块1台、支路绝缘监察模块1台。
硬件分工解析：PLC224主机可以检测6路模拟量，分别是电池组电压、电池组充放电电流、负载电流和1路交流进线的3相交流电压。EM231模拟量模块通过传感器检测2路交流进线的3相交流电压。控母电压、合母电压及母线正负对地电压则由支路绝缘监察模块完成检测。系统内部开关量有PLC224主机剩下的8个输入点进行检测，馈出开关状态有PLC扩展模块EM221完成检测，电池巡检和馈出支路接地电阻有相应的检测模块完成检测。
2、监控系统功能要求：根据上述功能要求减少第2路进线交流电源的检测，直接检测双电源切换装置的下口3相交流电压；
按照上述要求，根据上述硬件配置减PLC扩展模块EM231及相应的传感器。
3、监控系统功能要求，根据“1、监控系统功能要求”减少了第2路进线交流电源的检测及电池巡检功能。
按照上述要求，根据上述硬件配置减PLC扩展模块EM231、相应的交流电压传感器及电池巡检模块。
4、监控系统功能要求，根据“1、监控系统功能要求”减少了第2路进线交流电源的检测、电池巡检功能及支路绝缘监察功能。
按照上述要求，因为去掉了绝缘监察模块，所以检测控母、合母及正负对地电压的功能要转移到PLC模块上。由此，该监控系统需要加装PLC模拟量扩展模块EM231及相应的直流电压传感器。由PLC主机检测电池组电压、控母正负对地电压（由此可计算出控母电压）、电池组电流、负载电流，PLC扩展模块EM231检测三相交流电压，电池巡检功能由电池巡检模块完成。
监控系统通讯网络连接：由5.7寸触摸屏做主站（PLC做主站的方案成本要高，因为这样PLC需要占用2个通讯口，需选用224XP或226的PLC，此种方案适用于模块多的大中型系统），该HMI有两个通讯接口，COM1做主站接口，COM2做后台通讯的从站接口。COM1用RS485的方式引出总线，该485总线分别接入PLC主机模块、电池巡检模块、支路绝缘监察模块、数字式充电模块。
监控系统的通讯协议：内部总线与后台接口均采用标准MODBUS-RTU协议，该协议具有通用性好、协议功能规范、传输数据效率高等特点，受到广大自动化厂家的青睐。
由此可得出，PLC监控系统的配置方案灵活，选型需谨慎。
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