On Wed, 2008-10-22 at 21:03 -0400, Dave Keeton wrote: > I agree. Every time I have mentioned it the discussion ends up with > "It's a bad idea to run servos from modbus". I couldn't agree more but > it could be very usful for simple digital I/O very safely. > > Dave > > On Tue, 2008-10-21 at 09:25 +1000, Peter Homann wrote: > > Rather than writing "another" serial interface why not use Modbus and a > > device like the ModIO > > http://homanndesigns.com/store/index.php?main_page=product_info&cPath=2&products_id=4 > > > > The Modbus protocol is extremely robust and has a number of saftey > > features built in. > > > > Cheers, > > > > Peter. > > ------------------------------ > > http://www.homanndesigns.com > >
There is a ModBus feature in Classic Ladder, but it seems to me that an HAL component specifically for the ModIO peripheral would be useful. ModBus may be a standard, but peripherals that use ModBus vary widely. My thinking is that each peripheral needs its own HAL component that provides HAL pins covering the peripheral's features. ModBus would be handled in the background. Handling multiple peripherals may be an issue, but handling a single unit per serial port should be "easy" for someone comfortable with writing software. I started work on this a while back, but I have not had time to get back to it. http://www.wallacecompany.com/machine_shop/EMC2/modbus/ If someone wants to take a stab at it, I can send you my ModIO with LCD and cables, and I can try to make it worth your while to get the project to the next milestone. Expect the results to be shared with the EMC community. Kirk ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
