Sergey Izvoztchikov wrote: > Is there an issue of EMC2 not being able to keep up with hardware ? > What is typical frequencies involved with servo based CNC systems, > where EMC2 is used to close the loop ? Could more powerful computer > help in this case ? Yes, sure, speed helps, but most servo interfaces need MUCH less computer resources than software-generated steppers. At one time I ran a 3-axis servo system with a 100 MHz Pentium Classic and EMC1, with a 1 KHz servo update rate. Clearly, HAL has added some additional overhead, and I now get good performance with a 600 MHz Pentium II. I can go to 5 KHz with 3 or 4 axes on that system. I tried to do 5 KHz on a 6-axis control with that same CPU, and it was too slow. 2 KHz worked OK. My boards use the parallel port for I/O to the CPU, and PCI plug-in boards are nearly twice as fast as the typical motherboard parallel port. I'm sure PCI controller cards (as opposed to connecting through a PCI parallel port card) do much faster I/O.
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