Individual Functions6- 95Individual FunctionsThis section explains the individual functions used in special applications. Using MEMOBUS CommunicationsYou can perform serial communications with MEMOCON-series Programmable Controllers (PLCs) or simi-lar devices using the MEMOBUS protocol.MEMOBUS Communications ConfigurationMEMOBUS communications are configured using 1 master (PLC) and a maximum of 31 slaves. Serial com-munications between master and slave are normally started by the master, and the slave responds.The master performs signal communications with one slave at a time. Consequently, you must set the addressof each slave beforehand, so the master can perform signal communications using that address. Slaves receiv-ing commands from the master perform the specified function, and send a response to the master.Fig 6.57 Example of Connections between PLC and InverterCommunications SpecificationsThe MEMOBUS communications specifications are shown in the following table.Item SpecificationsInterface RS-422, RS-485Communications Cycle Asynchronous (Start-stop synchronization)Communications ParametersBaud rate: Select from 1,200, 2,400, 4,800, 9,600, and 19,200 bps.Data length: 8 bits fixedParity: Select from even, odd, or none.Stop bits: 1 bit fixedCommunications Protocol MEMOBUS (RTU mode only)Number of Connectable Units 31 units max. (when using RS-485)MEMOCON-series PLCRS-485 connectionsexampleInverter Inverter Inverter
