Posted 7 Nov 2019 I have direct logic 305 plc and the DCU is faulty and I need to extract a copy of the program to have as a back up. Is there anyway of doing this without the DCU Share this post Link to post Share on other sites
Posted 11 Nov 2019 https://cdn.automationdirect.com/static/manuals/qsdsoft/qsdsoft.pdf The above is a quick start guide. https://cdn.automationdirect.com/static/manuals/d3dcu/d3dcu.pdf The DCU error can be a CPU or Base communication error. Try connecting to the PLC and see if you can communicate to download the software. (See link above.) Regards, Garry Share this post Link to post Share on other sites