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General Mach Discussion / Re: Need more IO with Mach? How about 91 with Modbus.
« on: February 14, 2007, 02:58:16 PM »
Thanks for the feedback fer_maryl, we will definitely keep working on the ramping ability. Actually, we did have smooth ramping here in the office, but lost the ability to track the exact number of steps at the same time.
One additional point...the problems seemed specifically with Gecko stepper drivers, possibly due to the common-anode optoisolator instead of common-cathode as our Xylotex drivers use. We were able to get no lost steps under a light load (desktop CNC axis, no cutting) even without ramping up to about 4,000 Hz. So it may be possible that even if we implement ramping, the Gecko drivers will still lose steps without some kind of current buffer.
One other thing that we didn't try, and I'd be curious to hear the results...the mid-band compensation disable jumper on the option block inside the G201 driver.
Anyway, if you want to get Modbus working with the Cubloc, it's pretty simple and I can help you set that up over on the Cubloc forums.
One additional point...the problems seemed specifically with Gecko stepper drivers, possibly due to the common-anode optoisolator instead of common-cathode as our Xylotex drivers use. We were able to get no lost steps under a light load (desktop CNC axis, no cutting) even without ramping up to about 4,000 Hz. So it may be possible that even if we implement ramping, the Gecko drivers will still lose steps without some kind of current buffer.
One other thing that we didn't try, and I'd be curious to hear the results...the mid-band compensation disable jumper on the option block inside the G201 driver.
Anyway, if you want to get Modbus working with the Cubloc, it's pretty simple and I can help you set that up over on the Cubloc forums.