S5 115U as DP slave

Hello guys,I am communicating a S7-300 PLC as a master with one S5 115U(IM 308C) as slave using Profibus DP.I would like to be able to read all four analog inputs cards (16 inputs each) at the central rack and other four cards at the expansion rack in the S5 PLC from the master S7. So far I have had success reading only three AI cards.Is there some body out there that could help me on this?.

Thanks a lot

Eduardo

Eduardo,

the easiest solution is to modify the PLC-program in your S5 plc and to copy the analogue inputs in the S5 plc directly to the DP output area you defined to communicate with the S7 PLC.

In your S7 PLC, you should then receive your analogue values.