On 13 May 2012 22:48, Roger Holmquist <[email protected]> wrote: >> > 1) differential analogue ports: in 4, out 4 ,resolution 12 bits, >> > sample rate 10 Ms / s
> That might be tricky, what's the application? > Well, I know there is at least one analogue control signal in one of the > lathes for the spindle engine but I guess it's better to use a filtered > PWM-signal for that? Well, any analogue output method will do, there are many options. Pico-systems has a 4-channel DAC board for driving servo amps in conjunction with their PPMC: http://www.pico-systems.com/DAC16.html and Mesa has the 5i25 / 7i77 combination for the same sorts of application. > About the analogue inputs it's intended for a fairly high resolution > physical signal monitoring and I guess not necessary in a final system. > i wonder if LinuxCNC can handle such data? Not really, no. The servo-thread in LinuxCNC where such acquisition would normally take place runs at 1kHz. However, that assumes that you want the 10Ms/s data in realtime, and I rather suspect that you don't. You might be able to use one of the serial-port PC oscilloscopes, picotech have Linux drivers: http://www.picotech.com/linux.html (this is a different "Pico" to Jon Elson's company that I mentioned earlier, in case there is any confusion) > Anyway, there might also beposition sensors or other analogue sensors > who need suitable ports in a real CNC-system? If 1kHz sample rates are OK then the only options I know of are the Mesa 7i65 which has 8 channels of 12-bit analogue inputs (A to D) and 8 channels of 16 bit D to A. Note that that connects to the 5i20 / 5i23 / 5i22 / 7i43 style of FPGA card, not to the 5i25 / 6i25 style. ( http://www.mesanet.com) There is a much cheaper ($79) board that has 4 channels of 8-bid A-D which can be used with either style as it is one of the smart serial devices. There is no point having any faster sampling rate if you expect LinuxCNC to act on the information. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
