Australia Posted 21 Oct 2011 I do not know if you experienced any success with this Greg, but I have an incredibly similiar problem. My set up is: M340 linked to Connexium Ethernet Swap linked to EGX100 Gateway linked through modbus serial Sepam Safety relay. I have written the ST https://jaidenmchkp.bloggip.com/19130747/modicon-m580-options