ACS350-03E-23A1-4 ACS350-03E-23A1-4 ACS350-03E-23A1-4
芯片容量不同这主要体现在容量和运算速度上。西门子CPU226的程序容量20K,数据容量14K;而三菱PLC总共才2K或8K,后来的3U倒是有所改进。西门子PLC常规标准配置2个RS485口即PPI口,通讯速度187.5K;而三菱PLC都是一个RS422口,而且速度是9.6K。如果需要连个智能仪表什么的则另购485-BD等特殊模块。而且两个通信口可以一个连接下载数据线一个连接触摸屏进行调试程序,否则你就要拔下触摸屏数据线再连接触摸屏数据线,来回调整程序非常麻烦。产品定位不同西门子PLC的优势是过程控制与通信控制,模拟量模块价格便宜,程序简单,而三菱PLC的模拟量模块价格昂贵,程序复杂,西门子PLC做通信也容易,程序简单,三菱在这块功能较弱。
三菱PLC的优势在于离散控制和运动控制,三菱PLC的指令丰富,有的定位指令,控制伺服、步进和要实现某些复杂的动作控制很容易实现,而西门子PLC在这块就较弱,没有的指令,做伺服或步进定位控制不是不能实现,而是程序复杂,控制精度不高。
综上所述,针对不同的设备不同的控制方式,合理的选用PLC,用其长处,避其短处,才能的选择。选择某种品牌学习,要结合实际情况,看是否要针对某各行业,小企业,日资企业,台资企业三菱用的比较广泛;大企业和内地、北方是西门子用的较多。
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