Joe Gwinn wrote:> But my question is about the state of the art in PTP systems,
not
> systems in general.
(Shrug) I have Seven {About $500kUSD} AB GuardLogix Systems
using AB {ODVA} CIP Sync IEEE 1588-2008 standard for time synchronization.
It is not using any NTP, GPS, or IRIGB clock sources (although it could).
Typical offsets I have observed {it claims} from the MasterClock are around
180ns;
(through up to three AB routers / switches that support IEEE 1588-2008 PTP ).
I haven't done any long term data logging of the offsets,
as much as a few ms of offset would be fine for the application.
Integrated Architecture and CIP Sync Configuration Application Technique
<http://literature.rockwellautomation.com/idc/groups/literature/documents/at/ia-at003_-en-p.pdf>
if anyone is interested in reading 180pages of mostly proprietary stuff.
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