hey guys I grabbed another MPG I had on my slant bed lathe that needs a retrofit next, this one is a 5 volt mpg so I get a way from the annoyance for now of having a 12 volt mpg though I will still try Johns idea with resistors as this other mpg is a fanuc brand and much stiffer and not so nice as my first option so I will probably use the other option
can I just get you guys to look over my thinking here and tell me if I am moving in the right direction? by the looks of it first things first I need to set up my 7i76 into mpg mode with this piece of code in the Hal file *sserial_port_0=20xxxxxx* Then I need to connect up mpg to inputs 16 and 17. Power from 24 volts io power source (pulled down to 12 volts by resistors) For the rest I am following Rods excellent spaceship build thread he explains it so good. I will probably be in touch about the Hal connections though So I think I am away laughing. Though now I'm thinking I need to get a mpg pendant instead of just installing the mpg in the panel haha. Does anyone have any reasonablely priced simple mpg pendants I can buy? I just want a estop, selector switches and mpg on it. And would like cheap lol😂 Regards Andrew On Tue, Mar 31, 2020 at 3:39 PM andrew beck <[email protected]> wrote: > hey guys I love both the suggestions. I have a problem though. > > the whole of New Zealand is currently on lockdown and I can't buy anything. > > I have a whole box of resistors that I bought and might have a few diodes > left. > > is it possible to hack something together for now? > > and also do you guys think it would be possible to connect 24 volts > directly to the 12 volt mpg or I am going to blow something? my initial > thought it bad idea but it can't hurt to ask > > On Tue, Mar 31, 2020 at 3:36 PM Chris Albertson <[email protected]> > wrote: > >> How much current is needed in the 12 volt supply? I'm guessing less >> than 100 ma. >> >> If you have 24 volts DC available then you can drop it down to 12 volts a >> few different ways but the simplest might be an LM7812 linear regulator. >> The LM7812 is nearly bomb proof. These cost under $2 >> Look at figure 9 on the datasheet and note the values of the caps are not >> critical at all. >> https://www.mouser.com/datasheet/2/149/LM7812-461970.pdf >> <https://www.mouser.com/datasheet/2/149/LM7812-461970.pdf> >> >> >> >> On Mon, Mar 30, 2020 at 6:54 PM andrew beck <[email protected]> >> wrote: >> >> > hey guys I was asking about connecting a 12v mpg encoder to my mesa 7i76 >> > card. last week. I have done some testing with a pc atx power supply >> and a >> > multimeter and it looks like at 12 v when measuring between the A >> channel >> > and ground(0V) the high value is 5.2 volts and low is zero(or close to >> it) >> > also there are some nice status leds that show what the channels on the >> mpg >> > are doing. >> > >> > when powering it with 5 volts the leds don't work and the high voltage >> is >> > 2.7 volts and the low is zero volts. I read the threshold in the mpg >> > inputs is 2.5 volts with 10 percent hysteresis so I need to pull at >> least >> > 2.8 volts. also I am thinking that might be a bit close and result is >> > unreliable operation. >> > >> > Is there anyway I can supply this with 12 volts from my board? I am >> > running the field voltage at 24volts. >> > >> > regards >> > >> > Andrew >> > >> > >> > On Tue, Mar 24, 2020 at 7:53 AM Peter C. Wallace <[email protected]> >> wrote: >> > >> > > On Tue, 24 Mar 2020, andrew beck wrote: >> > > >> > > > Date: Tue, 24 Mar 2020 07:34:01 +1300 >> > > > From: andrew beck <[email protected]> >> > > > Reply-To: "Enhanced Machine Controller (EMC)" >> > > > <[email protected]> >> > > > To: "Enhanced Machine Controller (EMC)" < >> > [email protected] >> > > > >> > > > Subject: Re: [Emc-users] connecting up mpg >> > > > >> > > > Hey Peter. >> > > > >> > > > When I enable the mpg mode does that mean I will lose my whole >> config >> > or >> > > do >> > > > I just need to change something in the Hal file. >> > > >> > > YOU just change some settings in the hal file >> > > > >> > > > I'm thinking It sounds like the best thing is to setup all my io in >> > > > pnfconfig leaving the mpg inputs spare and then after that start >> hard >> > > > coding in Hal. >> > > >> > > Yes leave the 2 or 4 pins (for 1 or 2 MPGs) free if you want to use a >> MPG >> > > Note the enabling the MPG in the hal file will not cause you to lose >> the >> > > ability >> > > to use inputs 16..19 for normal digital input use >> > > >> > > > Do you know how much I can do in pnfconfig? >> > > > >> > > >> > > I dont think pncconf supports MPG setup, so this needs to be done by >> > > editing the >> > > HAL file >> > > >> > > >> > > > New Zealand is going in to total isolation for a month from tomorrow >> > > > because of covid 19 so I have some time for this lol :) >> > > > >> > > > Regards >> > > > >> > > > Andrew >> > > > >> > > > Regards >> > > > >> > > > Andrew >> > > > >> > > > On Mar 24, 2020 3:18 AM, "Peter C. Wallace" <[email protected]> >> wrote: >> > > > >> > > > On Mon, 23 Mar 2020, andrew beck wrote: >> > > > >> > > >> Date: Mon, 23 Mar 2020 17:32:56 +1300 >> > > >> From: andrew beck <[email protected]> >> > > >> Reply-To: "Enhanced Machine Controller (EMC)" >> > > >> <[email protected]> >> > > >> To: "Enhanced Machine Controller (EMC)" < >> > > [email protected]> >> > > >> Subject: [Emc-users] connecting up mpg >> > > > >> > > >> >> > > >> Hey guys. >> > > >> >> > > >> I have a 12 volt mpg >> > > >> >> > > >> I want to connect it to the 7i76 board. do you know if I can >> connect >> > it >> > > >> straight up. I think that the mesa boards only want 5 v and I am >> not >> > > sure >> > > >> how to connect up my 12 volt mpg >> > > >> >> > > >> >> > > > >> > > >> > >> https://drive.google.com/file/d/1uOF2y7KFSchXLhQ3s79GSB1x_WZieQ5l/view?usp=sharing >> > > >> >> > > >> I did a bunch of searches on the forum but couldn't get a definite >> > > answer. >> > > >> >> > > >> I tried to attach a photo but it bounced back. so here is a link >> > > >> >> > > >> regards >> > > > >> > > > >> > > > You can connect a 12V MPG to the 7I76 MPG inputs (field inputs >> 16..19), >> > > but >> > > > not >> > > > the high speed encoder input. Note that the input threshold for MPG >> > > inputs >> > > > is >> > > > 2.5V so the MPG output needs to swing close to ground for reliable >> > > operation >> > > > >> > > > >> > > > >> > > >> >> > > >> < >> > > > >> > > >> > >> https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail >> > > >> >> > > >> Virus-free. >> > > >> www.avast.com >> > > >> < >> > > > >> > > >> > >> https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail >> > > >> >> > > >> <#DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> >> > > >> >> > > >> _______________________________________________ >> > > >> 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 >> > > > >> > > >> > > 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 >> > >> >> >> -- >> >> Chris Albertson >> Redondo Beach, California >> >> _______________________________________________ >> 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
