SINA_PARA for multiple devices

Hi, I got 15pcs of G120D VFD's, controlled over Profinet. I need to use acyclic communication to read/write some parameters.

For this task I'm using FB286 SINA_PARA Siemens FB. For each drive, I got unique instance DB, with appropriate hw ID, assignment of sxParameters, axis number and parameter number. Start bit is set to TRUE, until FB indicates done or error.

I'm aware that for same drive, only one FB286 can be triggered in the same time. But can I trigger multiple FB286 for different drives (different instance DB's) at same time?

In my opinion you can trigger the acyclic reading/writing for different drives at the same time as the success / time is mostly depending on the utilization of each single drive itself.

Another idea for your configuration would be to use the LAcycCom library for SIMATIC. This one includes a so called Resource Handling block which manages all the acyclic tasks automatically for you. So you can request read or write commands as often as you want without the need of taking care of the drive status - this is handled automatically and way more comfortable I would say if you have several drives and also ongoing acyclic requests from time to time.

Find the lib here:

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

SINA_PARA uses internally the RDREC and WRREC instructions and these have limitations on how many can be running active jobs at a time.

See https://support.industry.siemens.com/cs/ww/en/view/15364459

Thanks. For 1500 PLC's it's 20 jobs. 

Manual: SIMATIC S7-1500/ET 200MP Manual Collection
https://support.industry.siemens.com/cs/ww/en/view/86140384