Profibus Diagnostic Repeater Time Stamp

Hello,

Does anyone know how to set the time in a Diagnostic Repeater?

Whenever I read a record from the repeater into a PLC (using RD_REC), the time stamp is always 01/01/1994.

I have tried writing the time using Record 60, but the WR_REC function returns an error code to say the logical base address is invalid. I am using the Repeater's S7 diagnostic address for this value (8186 in my case). There are no output addresses configured.

I'm sure there must be an easier way...

Thanks,
Craig.

Hello Craig;

This information can be found in the Diagnostic Repeater manual :

SIMATIC Diagnostic Repeater for PROFIBUS-DP

https://support.industry.siemens.com/cs/ww/en/view/7915183

2.5 Time

The diagnostic repeater with the order number 6ES7 972-0AB01-0XA0 maintains a clock in order to time-stamp diagnostic events, statistical data, and topology data.

The time format corresponds to the S7 format "DATE_AND_TIME".

The time after power on is DT#1994-01-01-00:00:00:000.

The maximum possible end time is DT#2089-12-31-23:59:59.999.

2.5.1 Setting the time

To set the time in the diagnostic repeaters, read out the time from the CPU in the user program with SFC 1 "READ_CLK", and write this time "cyclically" to the diagnostic repeaters on the selected DP master system using SFC 58 "WR_REC" or SFB 53 "WRREC".

The time can also be read out from the diagnostic repeater using SFC 59 "RD_REC" or SFB 52 "RDREC" via the "Time" record.

The time reference should be set at regular intervals in order to ensure accuracy.

Siemens has prepared a function block based on the preceding to set the time on the diagnostics repeater; you can find it on the following link:

Diagnostics repeater: Setting the time

https://support.industry.siemens.com/cs/ww/en/view/15013976

Hope this helps,

Daniel Chartier

Thanks Daniel,

This is pretty much what I'm trying to do. However, as per above the return value from WR_REC is:

I'm using the diagnostic address (8186 in this case) for the LADDR input on the function block.

I will take a look at the Siemens block though - sounds promising.

Cheers,
Craig.

It seems my problem is with TIA Portal.

I have tried the example S7 5.5 Siemens function block and it works.

When I migrate the project to TIA Portal V13, it doesn't work.
The migration completes without error and the program compiles ok.
When the function block is enabled, the 'busy' output turns on and remains on indefinitely - even if the enable flag is subsequently removed.

Not sure where to go from here as I need to be able to use the function in TIA.

OK, found out where I had gone wrong...

The 'Time Synchronisation' setting in the device properties needs to be set to OFF.
For some reason I had turned this on in the TIA project.

Both the DT_TO_DR and WR_REC options now work nicely.