B.5 Drive Operations by MEMOBUS/ModbusThe drive operations that can be performed by MEMOBUS/Modbus communication depend on drive parameter settings. Thissection explains the functions that can be used and related parameter settings.u Observing the Drive OperationA PLC can perform the following actions with MEMOBUS/Modbus communications at any time regardless of parametersettings (except for H5-ooparameters):• observe drive status and drive control terminal status from a PLC.• read and write parameters.• set and reset faults.• set multi-function inputs.Note: Input settings from the input terminals (S1 to S8) and from MEMOBUS/Modbus communications are both linked by a logical OR operation.u Controlling the DriveSelect an external reference and adjust the parameters in Table B.1 accordingly to start and stop the drive or set the frequencyreference using MEMOBUS/Modbus communications.Table B.1 Setting Parameters for Drive Control from MEMOBUS/ModbusReference Source Parameter Name Required SettingExternal Reference 1 b1-01 Frequency Reference Selection 1 2b1-02 Run Command Selection 1 2External Reference 2 b1-15 Frequency Reference Selection 2 2b1-16 Run Command Selection 2 2Refer to b1-01: Frequency Reference Selection 1 on page 18 and Refer to b1-02: Run Command Selection 1 on page 19for details on external reference parameter selections. Refer to Setting 2: External Reference 1/2 Selection on page 97 forinstructions on selecting external references 1 and 2.B.5 Drive Operations by MEMOBUS/Modbus322 YASKAWA ELECTRIC SIEP YEAHHP 01B YASKAWA AC Drive – A1000 HHP Programming Manual
