On Thu, Jun 11, 2009 at 10:32:57AM +0000, lesw...@gmail.com wrote: > 1. What board is easiest to configure fort this. I am leaning toward a > Pluto or a mesa 7i 33
I recommend Mesa over Pluto without hesitation (and I say this as the guy who wrote the FPGA firmware and HAL driver that run the pluto-p). The Mesa hardware is quality and comes from folks who have years of experience designing hardware intended for industrial use. The Pluto-P, on the other hand, was designed for minimum cost and hobbyist-level reliability. > 2. Will this work using the board to control a 0-10 volt control to the > 2250 on a pid loop it also has to have output for fwd rev and enable the Mesa 7i33 is designed for -10..+10 output, not for 0..+10 plus direction. First, check whether your amplifier can take a bipolar input--if so, you're good to go (I found an indication that a similar model number, fincor 2230, does take +-10V input; I couldn't find info on the 2250). If not, you have several alternatives. You could use an additional output pin on a second I/O connector for direction; in HAL you would use 'abs' and 'comp' to split the PID output into an always-positive magnitude and a direction. If you are good with electronics, you could also build a 7i33-like board which creates the output you need--the input to 7i33 is PWM and direction, which is turned into analog on the 7i33. A third alternative would be to alter the ribbon cabling so that 7i33 gets PWM but a fixed direction, with the real direction signal going to the amplifier with > 3. Will I need any other hard ware for now I want to be as cheap as > possible? At a minimum, you need a Mesa FPGA card (5i20 for PCI, 7i43 for EPP parallel port) in addition to the 7i33 analog servo interface. You are likely to also need an isolated or protected I/O card for the direction signals and any other I/Os your machine requires: 7i37 for full isolation, or 7i42 for protection against a limited range of voltages from +12V to -5V. Jeff ------------------------------------------------------------------------------ Crystal Reports - New Free Runtime and 30 Day Trial Check out the new simplified licensing option that enables unlimited royalty-free distribution of the report engine for externally facing server and web deployment. http://p.sf.net/sfu/businessobjects _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
