Posted 30 Mar 2018 Hello everyone! I'm the new of site. I have a PLC Mitsubishi Q03UDE and want to latch data of D register. I've set the latch data from D500 to D580 in PLC Parameter, you can see it in the picture i've attached. It seems work well when I turn on PLC everyday, but when i turn off PLC for a few days ( about two or three days ), all the data goes to 0. So can you tell me what's the problem ? My PLC have no battery. Thank you in advance for your help. Share this post Link to post Share on other sites
Posted 30 Mar 2018 Well there you go you have no battery !!!! Share this post Link to post Share on other sites
Posted 30 Mar 2018 Thank you sir! So what can i do to latch data? I have known that the PLC have the RAM and ROM, can I write it to them and how to write? Share this post Link to post Share on other sites
Posted 30 Mar 2018 Well you can add a battery. :) Is the data static or does it change continuously? Share this post Link to post Share on other sites
Posted 30 Mar 2018 The data is sometimes change, sir ! Share this post Link to post Share on other sites
Posted 30 Mar 2018 But my PLC have a memory card Q2MEM-1MBS. Can I latch data into memory card and restore it when PLC power on? Thanks! Share this post Link to post Share on other sites
Posted 30 Mar 2018 Yes create some file registers (R devices) on the MEM card and use those instead of D500 or make a copy at the beginning and end of the program. Share this post Link to post Share on other sites
Posted 31 Mar 2018 When powering off the PLC without a battery- you have approximatley 3 minutes before the standard ROM capactors will completley discharge.. Share this post Link to post Share on other sites
Posted 4 Apr 2018 I do it, thank you very much sir! Share this post Link to post Share on other sites