Thank you for your answers. I overlooked 7i77 (and probably with 5i25) for this task.
Please explain is 5i25 needed for 7i77, or can I plug it directly to parallel port? Will it be fast enough for 5 servo motors (analog out, encoder in, other I/O)? Servo drive manual states that encoder outputs are differential and have to be connected to "Applicable line receiver: SN75ALS175 or MC3486 manufactured by Texas Instruments or the equivalent". Are encoder inputs of 7i77 compatible with these? Marius On 2013.07.12 20:42, Peter C. Wallace wrote: > > Optos will be fine for spindle control, but for servo axis control they > will be rather iffy > > for example the quoted ACPL P480 will cause noticeble linearity and dead zone > issues if a high enough PWM rate is used (it has 250 ns worst case pulse width > distortion, for a 5I23 with its 96 MHz PWM base clock, thats ~25 PWM clock > cycles: more than 1/2% dead zone) > > The other issue is that for Axis drives you need good bandwidth and low > ripple, this basically means pushing the PWM frequency up as high as you can > (bad for optos) and multipole filters to get the best compromise of response > time and ripple. > > Peter Wallace > Mesa Electronics > ------------------------------------------------------------------------------ See everything from the browser to the database with AppDynamics Get end-to-end visibility with application monitoring from AppDynamics Isolate bottlenecks and diagnose root cause in seconds. Start your free trial of AppDynamics Pro today! http://pubads.g.doubleclick.net/gampad/clk?id=48808831&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
