Posted 17 Sep 2020 Hello all, I am working with an Rockwell 1769-L18ER PLC and Studio 5000 version 32. I am trying to setup an array of my UDT and index thru the array with a DINT. I assumed the syntax would be something like MyUDTArray[IndexDINT].Member but Studio 5000 indicates an error. Is there a method to index and array of a UDT? An example would be great. Any feedback is appreciated. Share this post Link to post Share on other sites
Posted 17 Sep 2020 (edited) Hard to help you... What is the structure of the udt? What data types? What was the code and how were you trying to use it? I created a udt called MyUDTArray with an array of 3 Member as DINTs. I created IndexDINT as a DINT. I then used a compare EQU and compared MyUDTArray.Member[IndexDINT] to 0. No issues here. Depending on how you are planning to use the member of the udt, sometimes it's easier to copy the first instance of it from the tag database, then you'll know where to replace the array valve with IndexDINT. To belabor the point, I then changed the tag database of MyUDTArray based upon the udt MyUDTArray from a single instances to an array of 3. Then I had to change my reference in the EQU to MyUDTArray[IndexDINT].Member[IndexDINT], again no issues. Edited 17 Sep 2020 by pcmccartney1 Share this post Link to post Share on other sites
Posted 17 Sep 2020 In the errors window, what does Studio say the error is? Share this post Link to post Share on other sites
