YASKAWA Varispeed F7 User Manual

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5 Transmission Interface215.4 Application Layer SpecificationsThe data format for the application layer conforms to the MECHATROLINK-II link com-mand specifications. The SI-T has the following main commands and sub-commands.The main commands are used in both the 17-byte and 32-byte data transmissions forMECHATROLINK-II and with MECHATROLINK-I. The sub-commands can be used onlywhen the 32-byte data transmission has been selected by means of pin 2 on DIP switch S1. Ifa conflict occurs between a request for a main command and a request for a sub-command,the request for the main command is processed. If either a main command or a sub-com-mand is already being processed, the command being processed is given priority. If anINV_CTL main command and an INV_I/O sub-command conflict, the sub-command over-writes the main command.For details on command formats, refer to Chapter 7 MECHATROLINK-II Commands.Table 1 Main CommandsName FunctionNOP No OperationPRM_RD Reads Parameters.PRM_WR Writes Parameters.ID_RD Reads ID numbers.CONFIG RAM Write ENTER_CODE and EEPROM WriteENTER_CODEALM_RD Reads fault and alarm.ALM_CLR Clears fault and alarm.CONNECT ConnectDISCONNECT DisconnectINV_CTL Controls Inverter Operation.SYNC_SET Starts Synchronous Communications.Table 2 Sub-commandsName FunctionNOP No operationPRM_RD Reads Parameters.PRM_WR Writes Parameters.ALM_RD Reads fault and alarm.INV_I/O Controls Inverter I/O.