MODBUS RTU comunication KC868 wich Siemens S1200 RS485

[naurismaculskis]

Hello. I have siemens S1200 PLC and I try to comunicate over Modbus RTU and can't get KC868-A6 comunicate over Modbus. Maybe someone has been seting up MB master and has some example in TIA portal? Or maybe someone knows MB Master Data addr?

I was trying to find register addres in  "KC868-A series board protocol – Modbus"  file but there it says that register is 0000 which does not work. 

I added MODBUS file in attacment for  KC868 series.

[admin]

do you have download KCS v2 firmware by USB-C cable firstly?

[naurismaculskis]

do you have download KCS v2 firmware by USB-C cable firstly?

Yes It helped, after update to V2 is alive. Now can read and write outputs and inputs. Only problem now to get DAC to respond. I was traying to edit value of it in 192.168.4.1 web brouser and monitor output on pins with mulimetter but nothing is changing. Maybe you have some idea what I need to change or set to get it working? Thanks

[admin]

can you take a photo, how you test DAC output with multi meter?