Unable to connect Mitsubishi FX-3U PLC FX3U-485-MB To MPPT(Charge Controller) through MODBUS
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praty,
Want to connect Mitsubishi FX-3U PLC To MPPT(Charge Controller) through MODBUS 0 votes
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1. Unable to connect Mitsubishi FX-3U PLC FX3U-485-MB To MPPT(Charge Controller) through MODBUS
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I am using Mitsubishi FX3u series plc with FX3u-485ADP-MB serial communicator.Now I have connect my PLC with serial communucator to MPPT Charge Controller through RS485. I have looped Ra to Sa and Rb to Sb took two wire to Mppt. The basic operation would be like PLC will be working as Master and Mppt as slave, Plc will read and write the data from Mppt in order to program the MPPT.0
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For execution Firstly i have set Mppt modbus address as 2. After that i have written ladder code for setting plc as master with required data baud rate etc as mentioned in manaual. After that i have used special instruction ADPRW for reading command code as follow. |ADPRW| H2 |H3 |K38 |K1 |D0 |which means |H2=Modbus address 2 |H3= Read Holding register| K 38 Modbus coil address(mppt has aPDU address mentined as 0×0026 which represent a battery voltage which i need to read in plc)| K8=device count|D0 =Destination device head. After that i write ladder in plc but after that also their was light blinking in sending receiving indicator. I have check all wiring connection but no output.0
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