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我这用一台10寸的触摸屏和多台PLC通信，所有的PLC采集的信号在触摸屏上显示，连接图请见附图。
1.如果是一台触摸屏只连接一台PLC，同时该PLC还和另一台PLC通信。
那么是否可以用普通的那种9针插头线缆来充当通信线缆（见附件图片）？谢谢~
2.如果是一台触摸屏只连接一台PLC，同时此台PLC还和另外好几台PLC通信，组成通信网络。那PLC之间，以及PLC和触摸屏之间的电缆该选用什么样的通信方式和通信电缆呢？谢谢
3.我的理解：
第1种情况，触摸屏和PLC，以及PLC之间通信可以选用普通的串口通信线缆，采用PPI通信，应该是RS485点对点之间的通信，第一个PLC利用NETR和NETW指令对第二个PLC数据读写，并将读取的数据储存，以便触摸屏访问。。
第二种情况，触摸屏和PLC之间可以继续用普通的串口通信线缆，但是PLC和PLC之间的通信电缆，只能选用Profibus DP插头，组成网络。
小弟没有实际的通信经验，不知道理解是否正确，还请前辈指正，谢谢！
另，关于实际的程序下载，对于第一种情况：
是不是单独地对PLC进行地址编码（比如2，3）然后单独地分别下载程序到两个PLC中？
对于第二种网络式的：
是不是要用DP电缆将所有的PLC都连接起来，一起上电，让电脑同时发现所有的PLC，然后在系统块里设置PLC各自的地址，并将程序下载的各自的PLC中？
问题很多，很乱，感谢前辈的耐心阅读，谢谢~~
问题补充：
谢谢你，原来大家说的DP接头就是你说的西门子网络连接器啊，呵呵，我刚才网购了几个，好的要几百，便宜的只需要几十。谢谢了，接头电缆到货后，我就自己组成网络试试效果。如果论坛不嫌弃的话，我想把试验的过程和图片上传，方便后来者参考，呵呵。
图片说明：
最佳答案
我的做法：
不管何种情况，PLC之间连接组成PPI网络，其中一个主站的另一个通讯口再与触摸屏相连。
至于使用何种电缆，西门子的Profibus电缆当然最好，普通的双芯屏蔽线也无不可，但是西门子的网络连接器还是建议使用为好，方便啊！
这样的连接，程序下载只能一个个来。
提问者对于答案的评价：
谢谢！
我刚才尝试了一下：
1.用紫色的DP电缆和4个DP接头，做了两根DP电缆。
2.一根DP电缆用于触摸屏和PLC224XP之间，一根DP电缆用于PLCCPU224XP和CPU224CN之间。
3.利用NETR指令将CPU224CN中的VW0传输到CPU224XP中的VW0。
4.在触摸屏上显示CPU224XP中的VW0数值大小。
实验证明，上述方法可行。触摸屏上显示的CPU224XP中VW0的数值与CPU224CN中VW0数值一致。
谢谢~~
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