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No.  The battery only backs up the RAM when the power is off.

Those are typically from noise in the system or the DC power supply regulator going bad.

What exactly is happening?

Joe T.

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The battery goes low in a Unitronics V570 at my printing machine, I want to replace the battery with the new one (Renata CR2450N).

Is it very very safe to replace the battery when V570 powered on, without back up data before?

How many seconds can we replace the battery without losing data when the V570 is on (because I don't have a PLC program).

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9 hours ago, Gugun said:

Is it very very safe to replace the battery when V570 powered on, without back up data before?

I don't think it's safe EVER to run a PLC without some backup precautions haven been taken. Eventually something will happen requiring need for a backup.

9 hours ago, Gugun said:

How many seconds can we replace the battery without losing data when the V570 is on (because I don't have a PLC program).

The battery is only used when the 24V power is disconnected from the PLC. If the PLC is powered on, then there is no time limit for replacing the battery.

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Gugun, are you able to connect to the 570 using Visilogic?  It's not difficult to do.  Get Visilogic at the link and once installed look up the help file for "PC" using the index tab, which will describe the connection process.

https://unitronicsplc.com/software-visilogic-for-programmable-controllers/

In theory the PLC program is "embedded" into the PLC, but the original programmer may have restricted access to extracting it from the unit.  However, the operational data which you may have "tailored" to your operation can be saved into a file for reloading if lost.  But it needs you running Visilogic and connected to the plc.  Advise if you can do this.

cheers, Aus

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Hello Gugun,

Another possibility we do with our team on "sensible" PLCs is to make a full backup on a microSD card before. We have V430 here, and you cannot plug the 24V when removing the battery (mechanically impossible) so the backup is important. 

It requires to know the Service menu password and to have the SD Password defined in the project first.

Nicolas

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