System configuration Page 6/23MID_M2000_BA_02_PB_16125. System configurationThe network diagram below illustrates a typical network configuration of Profibus ® deviceswith an RS485 interface. The Profibus ® devices with an RS485 interface do not need anysegment coupler. These devices can connect directly to the Profibus ® DP network.The maximum cable length in a segment depends on the transmission speed. TheProfibus ® DP daughterboard communicates at speeds from 9.6 kBps to 6 Mbps overdistances from 100 to 1200 meters.Baud Rate (pbs) 9.6 K 19.2 K 93.75 K 187.5 K 500 K 1.5 M 6MLength (m) 1200 1200 1200 1000 400 200 100The Profibus ® DP protocol has two distinct modes of operation - cyclic data-exchangemode and acyclic configuration mode. Two types of master devices are defined in a DPV1network.Figure 5: Typical network configurationSPS or PLC(master class 1)PC with SiemensPDM (master class 2)Profibus ® DP with max. 6 Mbits/sModBus ® RTUIMPORTANT: Only two master connections are supported ModMAG®M2000Profibus ® DPdaughter-boardOther Profibus ® DP(RS485 devices)Profibus USBInterface