Experimental Physics and
Industrial Control System

One suggestion for this would be to use an SNL program.  That way the fact that there is only 1 link does not matter.  The SNL code could read the value, modify it, and put it back.  Or it can read the data from an input waveform (every time it changes using monitors, for example) and write the output to annother output waveform.

 

SNL has the advantage that it uses channel access, so it can run on any machine, including but not limited to the IOC with the waveform records.  For things like FFTs that can be nice because there are often better libraries available on Linux/Windows/Mac then there are on vxWorks, for example.

 

Mark

 

 

 

Hi

 

I’d like to do some array calculations (FFT, rectangular to polar, filtering etc). I’d like the option to run at high rates (KHz) which would suggest using asyn. Is there any standard for this? Some possibilities are aCalcout, waveProc, genSub. If the waveform record had an input and an output I could easily put the calculations in the asyn layer but I can’t see an obvious way to build a processing chain with only one link. Any suggestions?

 

Also is there a standard for inverse subarray? I’d like to combine 100s of scalar PVs into one waveform.

 

Thanks

 

James

 

Senior Software Engineer

Diamond Light Source