I do have plenty of isolated inputs and outputs for that and my plan was to use those. But as I got to wiring it up, I thought it would be really neat to hook up all wires from each motor cable to their respective stepgen headers. This isn’t possible, I see… so back to the initial plan.
As a related question, what is the prevailing wisdom on working with multiple power supplies? Is it OK or advisable, for example, to tie the ground at the stepgen on header to the common pin on the isolated inputs, together with the ground for my 24v power supply? And a related question… I need to have individual enable and drive feedback signals because I am using the hard stop homing feature of the Clearpath drive (drive backs the axis into a hard stop and sets that as home) and I need to control the order in which homing happens. The way it works is, when configured to use hard stop homing, the drive will home when power is applied and the enable signal is high. Once motion stops, the feedback signal goes high, at which point I would home the next axis in the order. I suppose I could simply wire the feedback signal into the home switch to take care of the inputs. Is there a HAL signal that I can wire to the enable pins, perhaps with some sort of latching device? Thanks! > On Dec 1, 2018, at 8:40 AM, Peter C. Wallace <[email protected]> wrote: > > On Sat, 1 Dec 2018, Thaddeus Waldner wrote: > >> Date: Sat, 1 Dec 2018 03:52:12 +0000 >> From: Thaddeus Waldner <[email protected]> >> Reply-To: "Enhanced Machine Controller (EMC)" >> <[email protected]> >> To: "Enhanced Machine Controller (EMC)" <[email protected]> >> Subject: [Emc-users] 7i96 step-direction headers >> I am using TTL step-direction outputs on the 7i96 I/O board to drive a >> Teknic ClearPath motor. With the board set to TTL mode, is it possible to >> address the step- and dir- pins. I would like to use one for an enable >> output for the motor and the other for the feedback from the motor (input). >> >> Thaddeus Waldner >> > > No, the + and - step and direction pins are inverted copies of the same > signal. You can as Andy suggests limit the number of active stepgens in the > hal file and then use the freed step/dir pins as outputs (they can not be > used as inputs) > > You should also be able to use one of the 7I96s isolated outputs to drive the > enable (one output could perhaps drive all enables) > > Likewise you should be able to use the isolated inputs for drive feedback > (and if these are used to signal a drive fault you can also parallel them > if they are normally off or series connect then if they are normally on so be > able to use a single input to monitor all drives) > >> _______________________________________________ >> Emc-users mailing list >> [email protected] >> https://lists.sourceforge.net/lists/listinfo/emc-users >> > > Peter Wallace > Mesa Electronics > > (\__/) > (='.'=) This is Bunny. Copy and paste bunny into your > (")_(") signature to help him gain world domination. > > > > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
