V90 absolute encoder

Hello guys,

we purchased the hardware to control eletric axis in combination with an S7-1200PLC

-Sinamic V90 ethernet model

-Siemens servo 7kw with absolute encoder

-S7-1200 1212c

I referencing axis using v-assistant go to 0 with axis  click "SET REFERENCING" and also define Positive and Negative position limit. It works great.

My question is it is possible to offset or move this 0 coordinate without using v-assistant ? (for example with HMI). 

Thanks for your help,

Matej

Hi,

so it seems you want to use positioning inside the drive (EPOS function). 

You can do the absolute encoder adjustment from the PLC side by using a function block which is doing acyclic communication. See here:

https://support.industry.siemens.com/cs/de/en/view/109760317

Other option is to use Technology objects of the SIMATIC to do position control - then the homing is anyway realized within the SIMATIC. 

Thak you for answer

Yes, I want to position inside drive (EPOS).

Soo if i understund correcly, with this FB38000 block i can move my 0 reference point in + or - direction?

For exemple if i need to move reference 1mm in negative direction I must just write -1000 LU and then execute the block ,im i right ?

Thaks,

Matej

do you have download link for TIA 15.1 ? I did not find it

Thanks

Here it is (STEP7 and WinCC):

https://support.industry.siemens.com/cs/ww/en/view/109761045

Here the Updates for STEP7 V15.1:

https://support.industry.siemens.com/cs/de/en/view/109763890

And here for Startdrive including all updates (just in case you need it, not necessary for V90PN):

https://support.industry.siemens.com/cs/de/en/view/109760845

Please note that TIA V15.1 is not the latest one (TIA V16 is the latest), but for your purpose V15.1 is fine.

I did not make it clear enought :

I have TIA portal 15.1 on my computer I only need library for this FB38000 function block,

I found only for TIA 14.1 version

Thanks

Hi,

just open the .al14 library file in your TIA V15.1 -> it will be upgraded automatically to V15.1.

(open it in the tab of global libraries on the right side of TIA)

Hello guys,

I have found new problem while try to adjust absolute encoder on V90 drive :

Please see the video .

I have to click "execute" command at lest 5 times before encored is successfully adjusted.

Did somebody have have the same issue ?

Thanks for help,

Best regards, Matej 

Hi,

the status in "diagId" (DE80B500) means that the slave is not ready for acyclic communication. 

So either the drive was just started and still needs a while after booting to be ready for this or the acyclic traffic on that axis is quite high so that some requests are denied.

If you do this after startup, I would recommend to wait a little longer until you request the encoder adjustment.

If that does not help there is also a second and even better option for acyclic communication. 

There is a library called "LAcycCom" which has a resource manager included. That resource manager FB can check the slaves and starts requesting it only when it is ready. Then you would need to program the parameter accesses by your own. (writing reference point, starting adjustment, copy ram to rom).

Here would be the link: https://support.industry.siemens.com/cs/de/en/view/109479553

But I would try to keep using the Encoder Adjustment FB first, and just wait for a longer time or so. LAcycCom is the more complex solution.