I am trying to create a codesys3 data logger, any recommendations?
The library AC_DataLog may be useful but can't find how to use it examples.
still struggling importing OSCAT Network library 1.2.1.1. I have it in the library manager but the compiler doesn't allow me to use it yet. I can see the data type ex "DLOG_DATA" in the library but shows, as not defined when I try to, used it.

Hi,
this should point you in the right direction I guess:
https://help.codesys.com/webapp/ac_dlm_ ... n=3.5.13.0
For using the AC-data logger no extra license is needed.
You could choose to log into an csv file or sqlite db.

BR
Edwin

hi i am interested by the datalog functions too,
but i do not understand how to add my logging variables

I marked variable by {ac_datalog[:=DataLogChannel]}, but this didn't work. Has anyone have example how to use AC_DataLog?

Hi,

attached an example project:

PROGRAM PLC_PRG
VAR
    timer : Standard.TON;
    {attribute 'ac_datalog_hysteresis' := '1.745'}
    {attribute 'ac_datalog' := 'DataLogChannel'}
    iLogVar : INT;
    {attribute 'ac_datalog' := 'DataLogChannel'}
    rLogVar : REAL;
    {attribute 'ac_datalog' := 'DataLogChannel'}
    {attribute 'ac_datalog_hysteresis' := '0.745'}
    sLogVar : STRING := 'Hallo';
    //{attribute 'ac_datalog' := 'DataLogChannel'}
    arLogArray : ARRAY[0..4] OF REAL;
    
    {attribute 'ac_datalog_set_default_group' := 'DataLogChannel'}
    instStruct : LogStruct;
    
    {attribute 'ac_datalog_union_set_representant' := 'uiLog'}
    {attribute 'ac_datalog' := 'DataLogChannel_1'}
    instUnion : LogUnion;
    {attribute 'ac_datalog' := 'DataLogChannel_1'}
    {attribute 'ac_persist' := 'PersistenceChannel'}
    instFB : POU_Log;    
    
    {attribute 'ac_datalog' := 'DataLogChannel_1'}
    iLogVar2 : INT;
END_VAR

timer(IN := TRUE, PT:=T#5S);
IF timer.Q THEN
    iLogVar := iLogVar + 1;
    iLogVar2 := iLogVar;
    timer(IN := FALSE);
    rLogVar := arLogArray[2];
    instStruct.bLog := instStruct.bNoLog;
    instFB.Prop_Log := instFB.Prop_Log + 1;
END_IF

Keep in mind that extensive cyclic data writings will kill your storage device ( so handle with care what and where to save these data)

Cheers
Edwin

LogGenTestSP14.project [261.21 KiB]

Nice,

The attached project works like a charm. Thanks!!

This brings ups some questions;
Can the PLC itself now visualise the stored Sqlite db / CSV information? So showing the contents of the db/csv in a trend or trace by design with a local history
Ideally the PLC pushes the stored information after some trigger to a "consumer". Is there a way to facilitate this?
If not, any other ideas on achieving such a scenario are very welcome!

I would like to hear any thoughts on this, as the example shows how to save the data in a neat way but it does not show how to retrieve or send it.

is this datalogger can be used for 100ms data log ?

Thanks for the info on the Data logger. I've got it working great.

I do have 1 question, is it possible to have the data logger log someplace else? Like have it save it to a usb drive instead of PlcPrg?

Hello All,
Thanks to the project example LogGenTestSP14.project given by Edwin here before, i could modify my project to make AC_datalog beginning to work.
But i still have problem so i try to compile and make running the example application on my computer without success
i cannot even compile it without error .
I am running under V3.5 SP16 patch1. I got some AC_persistence message error.
I think i got similar trouble when i tried to compile HVAC example program showing HVAC library and developped using AC.
Thanks for any feedback

@eschwellinger Thanks for the great example. I think we are all interested in whether it is possible to log data using the "DataLogManager" module on an external memory such as USB / SD? It would be great if you could answer if there is such a possibility, and if so, please tell us how to set "DataLogManager" to write to external memory

It looks like this is possible for Schneider M241 PLC:
https://www.youtube.com/watch?v=JGbnlcLvtJo

Hello. I need to write to an external memory too (USB or SD).
It there a way to do that by using AC_Datalog?

Hello... I'm trying to make a datalog s&f in the plc... So it have to be a fifo type... Any suggestions?
Thanks in advance...