4-2 Function Mode „ Setting ModBus communication requires the following settings. Be sure to set the parameters as shown below. If the parameter settings are changed, the new settings are enabled at the point of change. However, ModBus communication will not start until "485" is selected with the 485/OPE selector and the Inverter is turned on again. The parameters of C070s cannot be changed or set through ModBus communication. Set using the attached Digital Operator. 4 Functions Communication Procedure •Follow the procedures below in regard to communication between the external control device and the Inverter. 1 External controller Inverter Time Wait time (silent interval +C078) 1:
Frame to be sent from the external control device to the Inverter (Query) 2: Frame to be returned from the Inverter to the external control device (Response) The Inverter returns a response (Frame (2)) only after receiving a query (Frame (1)) and does not output a response positively. Below is each frame format (command). Message Configuration: Query Header (Silent interval) Slave address Function code Data Error check Trailer (Silent interval) 4-66 Parameter No.
Function name Description A001 Frequency reference selection 00 (VR), 01 (Terminal), 02 (Digital Operator), 03 (Modbus communication) A002 RUN command selection 01 (Terminal), 02 (Digital Operator), 03 (Modbus communication) C071 Communication speed selection 04 (4800 bps), 05 (9600 bps), 06 (19200 bps) C072 Communication station No. selection 1 to 32 C074 Communication parity selection 00 (No parity), 01 (Even parity), 02 (Odd parity) C075 Communication stop bit selection 1 (1 bit), 2 (2 bits) C078 Communication wait time 0 to 1000 ms