Hello everyone,

I'm trying to use an arduino Duamelinove to comunicate with a Sinamics V20 inverter via RS485. I have a shield to convert the RS232 from the arduino to the RS485 from the inverter. I also have a RS485/USB adapter to monitor the communication from a computer.

I've loaded the SimpleModbusMaster library example on the arduino, and I'm getting transmission errors on the computer monitor (values different from what was transmited). The inverter receives the signal, but it returns a 'parity error'.

Advantages of SINAMICS V20 VFDs. SINAMICS V20 VFDs are versatile drives for basic applications. Integrated pushbutton interface also makes parameterization and installation a breeze. If you need an easy to commission, low cost, and durable VFD for easy applications, then the V20 line from Siemens is the perfect line for your application. This is my first post on this forum and first application on modbus rtu, so please by patient. I have PLC s7-1200 and inverter sinamics v20. I can change value of inverter parameteres or read some value, but I don't know which commands shall I send from mapping table to run motor. Thank you for any response. SINAMICS V20 basic converters 0.12 kW to 30 kW (0.16 hp to 40 hp) SINAMICS V20 basic converters 3 Overview SINAMICS V20 converters, frame sizes: FSAA, FSAB, FSAC, FSA, FSB, FSC, FSD and FSE SINAMICS V20 – The cost-effective, reliable and easy-to-use converter for basic applications Today, in an increasing number of applications in plant.

Data sheet for SINAMICS V20 MLFB-Ordering data Figure similar Mechanical data 107.8 mm ( 4.24 in ) Degree of protection IP20 / UL open type 68.0 mm ( 2.68 in ) Height Net weight 0.60 kg ( 1.32 lb ) Depth Size Width 142.0 mm ( 5.59 in ) FSAA Unshielded 50 m (164 ft) Max. Motor cable length Connections Shielded 25 m (82 ft). Brand: Siemens, Range: SINAMICS V20. Siemens V20 series AC Frequency Inverter for 0.37kW (0.5HP) 400V three phase motor in VxF control to 1.3A. Converts fixed frequency three phase 400V input to variable frequency three phase 400V to control the speed of a standard AC Induction motor. Size FSA: 90mm Wide x 145.5mm Deep x 150mm High IP20.

I also tried communicating the inverter with the computer, without the arduino, using a Modbus Master demo and, this time, it returns a 'character structure error'.

Sinamics V20 Parameter Setting

Has anyone ever tryied to do something similiar before? I'm not sure if this is even possible as everything I find online mention only communication between Siemens Inverters with Siemens PLCs.

Sinamics V20 Modbus Registered

Any thoughts would be appreciated.