5 Installation Procedure22 YASKAWA ELECTRIC SIEP C730600 89C YASKAWA AC Drive Option SI-EP3 Technical Manual Communication Cable TopologyThe option modular connector CN1 port 1 and port 2 act as a switch to allow for flexibility in cabling topology. Usersmay employ a traditional star network topology using a single communication cable port on the option.Users may also choose to employ a ring topology using both communication modular connector ports on the option andreduce the requirements of PROFINET switch ports.Figure 16Figure 17 Topology Options GSD FilesTo facilitate network implementation, obtain a GSD file from one of the following websites depending on your region:U.S.: http://www.yaskawa.comEurope: http://www.yaskawa.eu.comJapan: http://www.e-mechatronics.comOther areas: Check the back cover of these manuals.For questions, contact Yaskawa or a Yaskawa representative.PLCSWITCHPLCDrive DriveDriveDriveDriveDriveA1000