kivafishy

How to apply program changes in Mitsubishi

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Hi folks, one of my project was installing new analog module Q66AD-DG to Mitsubishi redundant PLC Q12PRH. All the configuration that had been done in GX developer and program in PX developer were working. I had compiled and downloaded the program. However, when I power off the PLC and power on again, the applied changes was not inside the PLC, the PLC still used the original program.

We had to reformat the PLC. After that, write an empty program to Mistubishi PLC, and then redownload the correct program into the PLC.

Is it because my modification had only been done in program memory. When PLC reboot, it loaded the program from ROM?

Is there any experts mind to share what is going on here?

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Either clear the Rom or download the new program to the ROM. It's still an QnH and not universal type so it is not done automatically.

Tools = > Transfer to ROM or Transfer to MEM card if it's booting from the mem card (check dip switches on CPU)

Edited by Gambit

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