PLC model MELSEC A1SHCPU

[TiagoSim0]

Guys, help me out here. I have a PLC model Melsec A1SHCPU from Mitsubishi and I need to upload the program from its memory. But unfortunately the previous user has set a password to upload. I have no contact with the former user. Is there any way to remove this password and upload?

[Crossbow]

Discussion bypassing passwords is not allowed on these forums.

[TiagoSim0]

I don't want to bypass the password. I'd like a way to upload without needing it.

[Crossbow]

Just now, TiagoSim0 said:

I don't want to bypass the password. I'd like a way to upload without needing it.

Which is trying to bypass the password.  The password is typically there to protect intellectual property.  

[TiagoSim0]

The company that designed the machine no longer exists, having closed its doors. Unfortunately, I have no contact with any of its former members, and I need to read this program. My intentions aren't bad; it's just a difficulty due to the company closing its doors.

[IO_Rack]

On 10/20/2025 at 8:54 PM, TiagoSim0 said:

The company that designed the machine no longer exists, having closed its doors. Unfortunately, I have no contact with any of its former members, and I need to read this program. My intentions aren't bad; it's just a difficulty due to the company closing its doors.

You could call Mitsubishi and attempt to prove ownership of this machine. I've never done this with Mitsubishi but this is Omron policy. 

You could perform an internet search for former members of the OEM. Maybe Linkedin?

These are two legitimate options and the best advice you'll get from this forum.

[TiagoSim0]

Ok, thank you for by education in the response.