Experimental Physics and
Industrial Control System

Di Maio Franck <[email protected]> · Mon, 18 Oct 2010 14:56:03 +0200

Dear EPICS advanced

An issue that I guess has been encountered in other labs already.

A typical ITER use case:

"Do A at time T", 
- T: a setting controllable by PV(s),
- A: an action implemented by a record triggered by an event occurring at time T.

We are implementing this use case with a module that receives time over PTP, so the time shall be expressed with nano-second resolution.

So we need:
- one unsigned int32 for seconds
- one (unsigned or not) int32 for fraction of second expressed as nano-seconds.
Same as time-stamp (TS), right?

Maybe 2 longout but I am not sure if UINT32 is OK with longout.
In addition, we'll have "pulse time", with a specific time origin, so maybe also sub or calc records to convert between relative and absolute time.

We'll appreciate advices on the records to be used... Good or bad ideas/experiences welcome.

Thanks in advance!

Franck

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System