Hi, Somewhat after the fact maybe, but I had a similar problem (AL code 0x37). These days, in document ETG1000_6_S_R_V1i0i2, page 30, there is a table with all the AL alarmcodes including: 0x0036 DC Sync0 cycle time 0x0037 DC Sync1 cycle time It would seem like your slave does not like your cycle time Regards, Len Remmerswaal