Hi CodeShepherd, Thanks for your reply. First please note that the data type is determined by XML file of the EtherCAT slave we are using. (see below). I'm not next to the system right now but when you double click and the window opens the data that is showing is : data type "byte array", bitlength "72", Value:"16x00,16x00,16x00,16x00,16x00,16x00,16x00,16x00,16x00" If you try to change the 00 to other value , when click Ok to close the window nothing happens, the window stays open. I noticed that this issue occurs with other fields as well - The main the difference is that with other fields, you can click to edit the value directly from the table I captured in my previous post while this specific value does not give you this option. (When you click once on other fields, the value becomes "selected" and you can edit it).
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