Nothing in that article is new other than possibly the use of a PLC for that kind of control without the use of a specific card designed for hydraulic control. Most PLC Hydraulic Servo controls setups require a special hardware card to do what they are doing.. and usually it is very expensive. Allen Bradley's Hydraulic control card is about $2500 for 1 axis. For a PLC, the S7-1200 PID loop is quite fast. But compared to LinuxCNC .. pretty much a dog. Looking at the article again, I have no idea why they published that. A lot of University Profs have to publish periodically as a condition of their employement. But it does make for an example fo hydraulic force and position control.
I just wanted to include this in the discussion so Stuart could see an implementation similar to what he needs. Dave On 9/27/2013 5:17 AM, andy pugh wrote: > On 27 September 2013 03:04, Dave Cole <linuxcncro...@gmail.com> wrote: > >> http://en.revija-ventil.si/data/strokovni-clanki/17-2011-4/situm.pdf > They seem to be rather re-inventing the wheel. > Servo-hydraulic tension-compression fatigue testing machines are all > like that, and have been running closed-loop in force or displacement > mode (with auto-switching to displacement control on specimen > fracture) for decades. > > ------------------------------------------------------------------------------ October Webinars: Code for Performance Free Intel webinars can help you accelerate application performance. Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from the latest Intel processors and coprocessors. See abstracts and register > http://pubads.g.doubleclick.net/gampad/clk?id=60133471&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
