4-2 Function Mode „ ModBus Communication Protocol Follow the procedures below in regard to communication between the external controller and the Inverter. (1) External controller Inverter Time (1): Frame to be sent from the external controller to the Inverter (Query) (2): Frame to be returned from the Inverter to the external controller (Response) The Inverter returns a response (Frame (2)) only after receiving a query (Frame (1)) and does not output a response positively. Wait time (silent interval +C078) 4 Each frame format (command) is shown below. Message configuration:
Query Functions Header (Silent interval) Slave address Function code Error check Data Trailer (Silent interval) •Pre-set numbers ranging from 1 to 32 in each Inverter (slave). (Only the Inverter having the same slave address as the query takes in the query.) •Broadcasting can be performed by setting the slave address to "0". •Data call or loopback cannot be performed while broadcasting. •Sends the function command. •The 3G3JX corresponds with the following data formats used in the ModBus. •Specifies a function for the Inverter to perform. •The function codes available to the 3G3JX are shown on the next page.
4-80 Data name Description Coil Binary data (1-bit long) that can be referred to or changed Holding register 16-bit long data that can be referred to or changed