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如题
问题补充：
总插拔触屏连接线会损坏通信口吗？
最佳答案
可以使用西门子快速连线网络接头(带编程口) 订货号6ES7 972-0BB50-0XA0 通过PROFIBUS DP电缆连接触摸屏与PLC。PLC的编程电缆插在带编程口的DP接头上就可以监控程序了。或者增加一个EM277模块，触摸屏通过MPI和PLC通讯。
EM277模块订货号 6AG1 277-0AA22-2XA0 。
如果在不增加硬件的情况下监控程序，就只有暂时拔掉与触摸屏的连接线，进行监控。
总插拔连接线肯定不好。因为CPU224编程口不支持热插拔。最好不要得电热插拔。有可能对触摸屏和PLC通讯口造成损坏。
提问者对于答案的评价：
jie ju le wo yu dao de wen ti.zai ci gan xie.
专家置评
1、断电插拔编程电缆
2、编程电缆接到带编程口的dp头上连接plc，不保证肯定可以连接plc
3、如果cpu集成通信口均被占用，看系统中是否有cp243-1或者EM277
4、如果均没有扩展模块，可以考虑加em277，如果系统允许加
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