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+--- Thread: MODBUS RTU comunication KC868 wich Siemens S1200 RS485 (/showthread.php?tid=8660)
MODBUS RTU comunication KC868 wich Siemens S1200 RS485 - naurismaculskis - 10-20-2025
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.
RE: MODBUS RTU comunication KC868 wich Siemens S1200 RS485 - admin - 10-20-2025
do you have download KCS v2 firmware by USB-C cable firstly?
RE: MODBUS RTU comunication KC868 wich Siemens S1200 RS485 - naurismaculskis - 10-31-2025
(10-20-2025, 11:33 PM)admin Wrote: 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
RE: MODBUS RTU comunication KC868 wich Siemens S1200 RS485 - admin - 10-31-2025
can you take a photo, how you test DAC output with multi meter?