siemens tp170A on profibus

[aleb2]

s7-300 cpu 314c-2dp, et200m and an MP270; now i have to add a tp170A, but i can see its variables values only if i get off the MP270 from the bus(their address are different);
someone have any ideas to solve this problem?

Thank you

 

[djs]

Hello;
There probably is no solution. Profibus is a master-slave network. The master polls data from the slaves assigned to it. A slave cannot have two master. However a master can also be a slave. Also a Profibus network can have multiple slaves.
What does this mean for you? More than likely, the CPU is a master to its slave I/O modules. Also the CPU is a slave to the MP270. When you add a second touch screen, it is also a master (not a problem). However it wants the CPU as its slave (is a problem because it is already a slave to the MP270).
Moral of the story: only one touch screen per CPU.

 

[aleb2]

In step7 hardware configuration, cpu comunication proprieties, in "op resources" it has to be selected the number of OP which the cpu is going to cominucate;in my configuration it was 3 and i was tryng to set the fourth tp;
now it is ok