I'm trying to set up a Profibus network between a CPU315-2DP (master) and a CPU314C-2DP (slave). I've got great problems. 1. For the master: when I'm configuring the hardware: I add the master, I add the Profibus network. If I download the hardware configuraton now, then there is no problem. If I add a slave to the Profibus network (the CPU314C-2DP) and download the configuration again, then immediately the SF LED goes on and the Bus LED starts to blink. Why? I haven't even downloaded OB1 and the PLC is in Stop Mode. 2.For the slave: When I configure the CPU314C-2DP as a Profibus DP Slave and download the configuration to it then again the SF LED goes on and the Bus LED blinks. Can someone help me? Thanks a lot!