Reading a Drive Parameter............................................................................................................. 280Writing to a Drive Parameter ........................................................................................................... 280C.8 Troubleshooting ................................................................................................................281Troubleshooting Checklist ............................................................................................................... 281D. METASYS N2 COMMUNICATIONS .................................................................... 283D.1 Metasys N2 Specifications ...............................................................................................284D.2 Communication Specifications ........................................................................................285D.3 Connecting to a Network ..................................................................................................286Network Cable Connection.............................................................................................................. 286Wiring Diagram for Multiple Connections ........................................................................................ 287Network Termination ....................................................................................................................... 287D.4 N2 Setup Parameters ........................................................................................................288N2 Serial Communication................................................................................................................ 288D.5 Drive Operations by N2.....................................................................................................292Observing the Drive Operation........................................................................................................ 292Controlling the Drive........................................................................................................................ 292D.6 Communications Timing...................................................................................................295Command Messages from Master to Drive..................................................................................... 295Response Messages from Drive to Master ..................................................................................... 295D.7 Metasys N2 Point Database..............................................................................................296Metasys N2 Analog Input (AI) Summary ......................................................................................... 296Metasys N2 Analog Output (AO) Summary .................................................................................... 297Metasys N2 Binary Input (BI) Summary .......................................................................................... 297Metasys N2 Binary Output (BO) Summary ..................................................................................... 298D.8 Mailbox Function ...............................................................................................................299Reading Drive Parameters .............................................................................................................. 299Writing Drive Parameters ................................................................................................................ 299D.9 Self-Diagnostics ................................................................................................................300E. MEMOBUS/MODBUS COMMUNICATIONS........................................................ 301E.1 MEMOBUS/Modbus Configuration ..................................................................................302E.2 Communication Specifications ........................................................................................303E.3 Connecting to a Network ..................................................................................................304Network Cable Connection.............................................................................................................. 304Wiring Diagram for Multiple Connections ........................................................................................ 305Network Termination ....................................................................................................................... 306E.4 MEMOBUS/Modbus Setup Parameters ...........................................................................307MEMOBUS/Modbus Serial Communication.................................................................................... 307E.5 Drive Operations by MEMOBUS/Modbus........................................................................310Observing the Drive Operation........................................................................................................ 310E.6 Communications Timing...................................................................................................311Command Messages from Master to Drive..................................................................................... 311Response Messages from Drive to Master ..................................................................................... 311E.7 Message Format ................................................................................................................312Message Content ............................................................................................................................ 312Slave Address ................................................................................................................................. 312Table of Contents8 YASKAWA SIEP YAIZ1U 03B YASKAWA AC Drive – Z1000 Programming Manual