Hey Kaare_t, Thank you for your reply,well I correctly set up the CC Link parameters with no errors and the LEDs are all solid green nothing is blinking. the parameters are as follows: Status(read) start from X1000 Commands (write) start from Y1000 Registers: D100,D200 I changed the Inverters Setting as recommended on the CC link option manual. The thing is I don't know how to write the ladder to initiate the communication and send commands to the inverter via the option.