Posted 23 Oct 2016 (edited) I tried setting parameter in gx works 2 for plc q series of q03ude cpu. I set retentive timer to 1k and reducing special link relay to 1k from 2k. then I set 0 in latch 1 start and 5 in latch 1 end. Getting error c4129 and c4139. I changed it to just 16 points of device, then put 0 in latch 1 start and 15 in latch 1 end, still getting same error code. In mitsi pdf of basic course, it just said all I have to do is to go to parameter>device>set retentive timer value to 32 from 0 to use 32 timers total, but I just simply getting error code of f1028 How to make it right? Got it now, have to uncheck retentive timer in tools menu. Edited 23 Oct 2016 by nyominn Share this post Link to post Share on other sites