Hi, according to http://linuxcnc.org/docs/2.7/html/man/man9/wj200_vfd.9.html the wj200-wfd component already has a toggle output for use by a watchdog. Then, there's a "watchdog" component: http://linuxcnc.org/docs/2.7/html/man/man9/watchdog.9.html
So, your HAL will basically need something like loadrt watchdog num_inputs=1 addf watchdog.0.process base-thread addf watchdog.0.set-timeouts servo-thread setp watchdog.0.timeout-0 0.1 net vfd-wdt wj200-vfd.0.watchdog-out => watchdog.0.input-0 net machine-en motion.enable-out => watchdog.0.enable-in net vfd-ok watchdog.0.ok-out HAL syntax and naming without warranty, as I'm just writing this from memory and the quoted manpages. Then you can connect vfd-ok to whatever you want (or whatever should know if the VFD is responding). The watchdog timeout will need to be set in accordance with the VFD update rate. For a userspace component, I'd not go much below 100ms to avoid false-positives if a response takes a moment longer to be processed. Bye, Philipp On 29.02.2016 19:59, dan...@austin.rr.com wrote: > Not a stupid question at all- I literally didn't do more than I said. > > I will try this ASAP. > > Do you know how to handle a "watchdog" that continuously checks whether the > VFD is running? > > Danny > > ---- Philipp Burch <p...@hb9etc.ch> wrote: >> Hi Danny! >> >> On 29.02.2016 08:15, Danny Miller wrote: >>> [...] >>> >>> loadusr -W wj200_vfd baud 19200 >>> #default slave address is 1 >>> setp wj200-vfd.0.mbslaveaddr 1 >>> setp wj200-vfd.0.commanded-frequency 60 >>> # connect to wj200-vfd pins >>> net spindle-on wj200-vfd.0.run >>> net spindle-cw wj200-vfd.0.reverse >>> net spindle-at-speed wj200-vfd.0.is-at-speed >>> >> >> Maybe it's a stupid question, but: Have you also connected the nets >> spindle-on, spindle-cw and spindle-at-speed to the motion component? >> >> I.e. something like >> >> net spindle-on motion.spindle-on >> net spindle-cw motion.spindle-forward >> net spindle-at-speed motion.spindle-at-speed >> >> See: http://linuxcnc.org/docs/2.7/html/man/man9/motion.9.html >> >> Then, wj200-vfd.0.commanded-frequency is actually a pin, which you >> can/should set dynamically as well: >> >> net spindle-rps motion.spindle-speed-out-rps-abs >> net spindle-rps wj200-vfd.0.commanded-frequency >> >> Good luck! >> >> Bye, >> Philipp >> >
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