s7-200不能用usb转串口线+数据线连接吗

2024-11-22 14:48:14
推荐回答(1个)
回答1:

1.最初学习200PLC时,没有编程线缆,我都是用工控机带的232的COM口,当时用232转485的转换器一个,D型9针公插头,3接正,8接负,自己焊就行。如果有条件,232转485的转换器最好选一个好点的,带隔离的。当时测试了好几个厂家有源和无源的转换器,大部分都通信不正常,但和西门子MM4系列变频器通信都很正常,可能存在兼容性。所以楼主的选用232/485转换器还需要进行实际测试才能知道能用不能用。
2.我最后用的是研华ADAM4520,缺点就是4520体积有点大,加个串口延长线就方便多了,电源可以临时取PLC上的传感器DC24V电源。但带隔离,不会因为意外烧PLC通信口。再有条件的,插头可选DP接头,正接绿*1,负接红色A1。PG/PC接口选择PC/PPI cable(PPI)。
3.如果你是笔记本,现在基本上没用串口了。你现在所用的USB转串口线可能兼容性不太好,无法建立连接。可以买条力特的USB转串口的线缆,我用的是力特的533A线缆,测试没问题,我的笔记本一直在用,现场即可调试MM4系列的变频器又能调试200PLC。和200PLC通信再加个232转485的转换器就可以啦。
4.以上只是针对口袋羞涩的初学者,如果你的经济实力雄厚,倡议购买使用西门子原装的编程线缆,订货号6ES7972-0CB20-0XA0 (USB接口),这个编程线缆可以给S7-200/300/400的PLC上载和下载程序调试,建议楼主优先考虑,就可以应对西门子S7系列的PLC。

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