ATS48 Start/Stop via Modbus

[Histo]

Hi, I would like to know the working principle of ATS48 when giving command from SCADA. 

My understanding is, When Logic inputs "Run" and "Stop" receives 24V, It will close "Healthy" (R1) Relay contact which I programmed as Isolation Relay. When "R1" Relay contact closes, It will energize K1 contactor then Starter receives 3phase supply.

Is this operation same in modbus communication? When "Run" Logic input receives signal by modbus from PLC, will it close "R1" relay contact? or Do we need to keep the "K1" contactor energized so the "Run" logic activate "R1" relay? I mean, Do we need the main power to the starter so it will show "RDY" and then only the modbus signal in "Run" logic will be a

[BJacqz]

The R1 is the fault relay detection, in case there is a detection, it will open, the ATS will not be connected on mains. you have to set R1 as isolating relay. The complete wiring is shown on the user's manual (see link)

[Bastian_Schmitz]

And as additional information, ATS48 has "only" Modbus RTU on the RJ45 not Modbus TCP like you wrote on your screenshot. ATS480 (new gen) could be adapt with an ethernet communication card.