What Mesa card for that?

I have a robot system on 5i26 + 7i76 ... 4axes ... now I would add an other axis .. but with analogue drive mode (so i need 1 encoder input and 1 analogue out at least) ... witch type of card I can add for to do these adictional work??

regards
giorgio

7i33TA


store.mesanet.com/index.php?route=produc...=83_86&product_id=74

k-1 wrote: I have a robot system on 5i26 + 7i76 ... 4axes ... now I would add an other axis .. but with analogue drive mode (so i need 1 encoder input and 1 analogue out at least) ... witch type of card I can add for to do these adictional work??

regards
giorgio

Do you mean a 5i25 or 6i25 + 7i76? (I don't think there is a Mesa card called a 5i26.)

Unfortunately the 7i33 will not work with the DB25 FPGA cards. If that is what you have.
If you only need to add one analog axis, and you are not using the encoder counter on the 7i76, you could just add a 7i83 to get some analog output channels. (It would connect to the SmartSerial port on the 7i76.)

If you need more than one encoder, you will need to add a 7i85 or a 7i77. (If you use the 7i77, you wouldn't need the 7i83.)

As far as I know the only options for reading encoders with the DB25 cards, other than a direct single ended connection, are the 7i85(s) and the 7i77.

my error is 6i25 you are in right .... for other project i need to drive 18 servodrive analog+encoder ... I know these I can buy 3pcs 7i77 but connect to only one 6i25 or 5i25 is not possible .... there are some other board can help me to make these project whitout using an DB25 card? with good performances not using rs422 ....

regards
giorgio

You could use a 7I80DB-25
This has 4 DB25 connectors so could support up to 4 7I77s or 24 Axis of encoder/analog out

Another option would be a 7I80HD (3X 50 pin connectors) with one 7I53 (12X encoder input) and one 7I52 (6X encoder input and 6X SSerial) daughtercards then adding 3x 7I83 for the 18 analog outputs

Edit: Peter's Idea is better for the 7i52 rather than the 7i48

If you need to connect 18 servos+encoders, I think I would start with a 6i24 (or 5i24 for PCI, or 7i80HD for Ethernet), plus one 7i53 (12 encoders+2 SSports), plus [strike]two[/strike] three 7i83 cards (6 channel analog out SScard). All of that only uses one of the FPGA card's three 50 pin headers. You'd still need 6 more [strike]servos, and one 7i48[/strike] encoders a 7i52 would cover that (header #2 filled). That would leave you with one more 50 pin header and 5 SSports for the rest of your I/O. What card(s) I'd recommend would depend on what kind and how much other I/O you need. [strike] If you need lots more I/O I'd suggest adding a SmartSerial interface card on the 3rd 50 pin header (like a 7i44) plus[/strike] Then add what ever SNoScards would suit your I/O needs[strike]. But if you don't need a huge amount of other digital I/O and something like[/strike] or a 7i37TA[strike] fills your I/O needs you could use that instead[/strike] on the 3rd header.

Another option using the DB25 style cards would be to use an Ethernet 7i80DB (it has 4 DB25 ports) plus three 7i77 cards.

(What in the world do you need 18 servos for? Sounds like a fun project. Remember Linuxcnc only supports up to 9 axis of motion. (Not sure what the real joint limit is in Master but the user interfaces stop at 9 there as well.)