Peter, But the only 5v output I need is for the servo drive enable(s) All the limits are 24v prox sensors etc.
On Mar 8, 2024 3:25 PM, Peter Wallace <p...@mesanet.com> wrote: [EXTERNAL EMAIL] Be sure links are safe. On Fri, 8 Mar 2024, Todd Zuercher wrote: > Date: Fri, 8 Mar 2024 19:59:14 +0000 > From: Todd Zuercher <to...@pgrahamdunn.com> > Reply-To: "Enhanced Machine Controller (EMC)" > <emc-users@lists.sourceforge.net> > To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> > Subject: [Emc-users] Mesa 7i84 Field IO? > > Hello, > > I am working at connecting a 7i84 IO card to a machine that I am refitting a > newer Linuxcnc PC to. The old PC used an ISA card for IO. That will no > longer be an option with a newer PC. > > My questions, the servo drives used 5v TTL signals for IO signals > specifically the ready/fault output, and the enable input. How should I > interface these with the new 7i84 card (which is using 24v field power)? > > The ready/fault output seems simple enough. It is an "open collector > outputs without pull-up resistors, they are rated for switching > non-inductive loads up to 40V at a maximum of 100mA" (quote from the drive's > manual). So I simply need to add a 24v pullup for each of those signals. > The question is what size pullup resistor should I use? > > The harder question for me is how to handle the 5v drive enables? Would it > be best just to connect them to via a relay? Or would there be a better > way? > > Other Mesa cards in this system, a 5i25, 7i85S, and 7i88. Both parallel > port headers are used on the 5i25. The smart serial port on the 7i85s is > used to connect the 7i84. All of the step/dir outputs on the 7i88 are being > used. The only IO not being used are on the 7i84, one encoder input and one > step/dir output pair on the 7i85s. > > Would it be ok to try to use one of the free the step or dir outputs as the > 5v enable signal for all 3 servo drives or is a relay on one of the 7i84 > outputs a better idea? > > Todd Zuercher > P. Graham Dunn > Inc.<https://nam04.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.pgrahamdunn.com%2Findex.php&data=05%7C02%7Ctoddz%40pgrahamdunn.com%7Ce108e8921bd54255526108dc3fade55a%7C5758544c573f47cebee96c3e0806fb43%7C0%7C0%7C638455263349734755%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C&sdata=XRIyXLeyG8U3g88fMC2Ol%2FSF1UiEtqXgnZsb%2FFOmKLE%3D&reserved=0<http://www.pgrahamdunn.com/index.php>> > 630 Henry Street > Dalton, Ohio 44618 > Phone: (330)828-2105ext. 2031 > > > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.sourceforge.net%2Flists%2Flistinfo%2Femc-users&data=05%7C02%7Ctoddz%40pgrahamdunn.com%7Ce108e8921bd54255526108dc3fade55a%7C5758544c573f47cebee96c3e0806fb43%7C0%7C0%7C638455263349743308%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C&sdata=bJdIPRVg10jNuyZNcT3IowWdwDqBOY1PC8aJ0%2BO6pgs%3D&reserved=0<https://lists.sourceforge.net/lists/listinfo/emc-users> > You can use a 7I84 with 5V I/O In this case you supply VIN with 12 or 24V but supply VFIELDA and VFIELDB with 5V This will make the I/O all 5V If you happen to have a REV A 7I84 you can run the whole card on 5V only (VIN,VFIELDA,VFIELDB) (none of this applies to the 7I84D) Peter Wallace Mesa Electronics _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://nam04.safelinks.protection.outlook.com/?url=https%3A%2F%2Flists.sourceforge.net%2Flists%2Flistinfo%2Femc-users&data=05%7C02%7Ctoddz%40pgrahamdunn.com%7Ce108e8921bd54255526108dc3fade55a%7C5758544c573f47cebee96c3e0806fb43%7C0%7C0%7C638455263349748706%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C0%7C%7C%7C&sdata=CU5cksSKPb%2B7qI5Zi4%2FDUAw47dXgWXEegfEEblxHMIU%3D&reserved=0<https://lists.sourceforge.net/lists/listinfo/emc-users> _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
