Re: New project...PCI based servo control board

[Jon Elson <elson-at-pico-systems.com>]

jmkasunich-at-ra.rockwell.com wrote:

>If I understand EMC correctly, the update rate for the
>servo loop is 1KHz.
>
No, the servo update rate is set by a parameter in the .ini file.  You 
can set
it for anything within reason.

>The signal conditioning stuff will probably force a
>two board solution.  Relays switching 120V don't belong
>inside a PC, and there isn't enough space on the back of
>a single PC slot for all the I/O wiring if everything is
>inside.  Maybe the bus interface, FPGA, etc., should be
>on the PC card, with a cable (50 pin ribbon or D-shell?)
>coming out of the PC to an interface card with opto-
>isolators for digital input, relays or solid state
>relays for digital output, and terminal blocks for the
>analog and pulse outputs and encoder inputs?
>
>The more I think about it, the more I think there are
>really THREE parts to the project.  (Although they may
>still wind up on only two boards.)
>  
>
Boy, I tell you, you may eventually end up designing what I did, for the 
same
reasons.

Jon