[?]: SAVE the actual value of DB's

[sobanski]

Hello I need to know how I can save the actual values on the online DB to a offline DB, like a new KP or KI from a PID control, this value can be inserted from the HMI and when I've a problem I can download my offline program and set the values of my gains or others variables.
I saw once somethig like this but I don't now how I can make this.


THX for your help

[Trafo]

Go ONLINE as a whole. Copy ONLINE DB's, paste them to OFFLINE.

[dsekulic]

Hi,
Why do You need to do so, because if You program S7-300 controller with MMC all data blocks are retentive. That means if Your PLC go down it will start up with last values.
regards

[sobanski]

ther is my problem I haven't the MMC card in a CPU 400 that I had the problem, so I'll try to make up a pointer to iniciate always my DB's with a last value like a looping set control,, and see what happens in the lab. THX for your help

[dsekulic]

Hi,
That is really problem with S7-400. But if You have backup battery You have data retention.
Problem is what to do if backup battery fail.
You can specify M memory area as remanence in Hardware Configuration.
Did You think about for example in OB35 to permanently store Your important data in M memory and on startup in OB100 to load M memory locations in appropriate data block.

in OB35

Code: Select all

L DB10.DBD0 // Ti
T MD0 // Memory for Ti

In OB100

Code: Select all

L MD0 // Memory for Ti
T DB10.DBD0 // Ti

regards

[sanruku]

I think you need something like this:

http://sourceforge.net/projects/s7dataarchiver/

It's free software too, so feel free to modify and share the code!

[sobanski]

So I'll try to use this software because the problem happens too when we make a download of a system data so I lose then all values again, and this software mabe can help me to not lose all my datas again or like a fast recovery. I'll see and send a report after I test it.

THX

[zxcslo]

Go ONLINE as a whole. Copy ONLINE DB's, paste them to OFFLINE.

When you are ONLINE in DB, just click icon for SAVE (upper left corner). It'll save the online values to the offline DB.

[sobanski]

I think you need something like this:

http://sourceforge.net/projects/s7dataarchiver/

It's free software too, so feel free to modify and share the code!

This software made the service that I need I recomend, because when you make a download including the system data blocks your CPU goes to stop state and back whit the initial values on DB's so with this software you can make a back up of your DB's and put again after in your CPU, don't losing any parameter of you PID's control or others important values that you adjust whit the process. It's very usefull in cases that you lost the datas.

THX everyone.