Sina_para_s multiple istance

Good afternon

I'have a doubt about the use of Sina_para_s (Fb287).

When I use this function block, it create automatically the istance DB (I call it Axis1).

Everything works on my sinamics s120 (in my office) using a cu320 profinet and one axis 6SL3120-1TE21-0AD0, so I can properly read and write all the parameters that I want!!

I write the sina_para_s function in OB1.

My question is: if I use a biaxis device 6SL3120-2TE21-0AD0, can I put in OB1 2 consecutive functions Fb287, the first one that works on DB Axis1 and the second one that works on the new istance DB "Axis2".

Of course the control unit is only one.

It's possible to do or I have to inhibit the first calling of FB287 during read/write on Axis2 and viceversa?

Thank you 

Hello,

yes you could call 2 instances - one for each axis.

But you are somehow right when you have doubts regarding parallel reading access to several axes.

The safest way is to set up and use the library "LAcycCom". This one is more sophisticated than simple SINA_PARA. It has a Resource Manager function included. You just start all reading / writing commands without checking the availability of drives and the Resource Manager automatically handles all requests for all drives. This is much more comfortable. Here you find the lib:

https://support.industry.siemens.com/cs/ww/en/view/109479553

So summary: with SINA_PARA you can easily do simple reading / writing requests. If you have more traffic and more axes to control I would always recommend using LAcycCom.

Thank you very much !!

so I can call 3 or 4 sina_para_s for each axis in the same time but referred to different axis.

Of course, i think if a have 3 control unit pn I can call for example 4 sinapara for cu 1 (cu1 with 4 axis) and follwing 4 sinapara for cu2 (cu4 for 4 axix) and so on...

Thanks a lot