Roland Jollivet wrote: > I see. And is the time stamp used as an integral part of the EMC > calculation? Or rather, does the Pluto interface for example, also supply > the same info? > > What I'm also wanting to know is; > If a system has 4 axis, that's 4 x (4x8) bytes to read per sample (=128 > bytes) > > Is it practical(for a low cost encoder board) to have only 8bits per > encoder. Since each sample is now only a 4 byte read, the sample rate could > be far higher, and the hardware becomes a lot simpler. > > If you read the counters at 1 KHz, then a 256-bit counter can probably only accept 127 counts in that period so that the direction of the rollover can be determined with certainly. I have several systems that run over 128,000 counts/second. If the CPU sampled the position faster, that would be less of a problem. But, all the other overhead means that the overhead directly due to the number of bits in the position counter is probably small.
Jon ------------------------------------------------------------------------------ The ultimate all-in-one performance toolkit: Intel(R) Parallel Studio XE: Pinpoint memory and threading errors before they happen. Find and fix more than 250 security defects in the development cycle. Locate bottlenecks in serial and parallel code that limit performance. http://p.sf.net/sfu/intel-dev2devfeb _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
