Latch Data of PLC Mitsubishi Q03UDE

[Minh_Tran]

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.

[Gambit]

Well there you go you have no battery !!!!

 

[Minh_Tran]

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?

 

[Gambit]

Well you can add a battery.  :)

Is the data static or does it change continuously? 

[Minh_Tran]

The data is sometimes change, sir ! 

[Minh_Tran]

But my PLC have a memory card Q2MEM-1MBS. Can I latch data into memory card and restore it when PLC power on? Thanks!

[Gambit]

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.

 

[collinsd70]

When powering off the PLC without a battery- you have approximatley 3 minutes before the standard ROM capactors will completley discharge..

[Minh_Tran]

I do it, thank you very much sir!