LinuxCNC with Mesa 7i65 and 6i24 FPGA

So just some background for those that aren't aware.

The Mesa 7i65 is a 8 axis analog servo card that supports TTL or differential encoder inputs.
The Mesa 6i24 is the PCI-Express (PCI-X) version of the 5i24, with 50 pin IDC connectors for I/O.

First post, so forgive my knowledge gaps.

Question 1.) Can the 7i65 and 6i24 work together with LinuxCNC, or would I be better off using the seemingly more popular 7i77 for analog servo control?

Question 2.) I have Yaskawa Sigma 1 servo drives (SGDB) I want to operate them in speed/velocity mode with LinuxCNC.
Sigma 1 Yaskawa SGDB drives in velocity/speed mode produce Quadruple Differential (RS-422) encoder output.
The Mesa 7i65 supports RS-422 differential encoders so I believe it should work with my Servo Drives.
Does that sound correct?



Question 3.) I have 50 pin IDC Ribbons where the old controllers 24v I/O connected. I'm hoping I can directly connect those 50 IDC ribbons into the 50 pin IDC connectors on the Mesa 6i24. Is that going to work?

6i24 Image

Thanks in advance!

1. Yes, a 6i24 and 7I76 can work together
2. Both the 7I65 and the 7I77 have differential encoder inputs so should work fine
with your drives
3. This depends on the pinout of the 50 pin connectors, all of our 50 pin I/O FPGA cards
have a pinout the matches OPTO22-Gordos etc 24 channel I/O module racks

A 6I25/5I25/7I92 + 7I77 would be a more common card set for this type of application
(perhaps with a 7I90HD added for 50 PIN I/O if your pinout matches)

I ended up going with a...

6i25 FPGA Card
7i77 Analog Servo Card
7I84 for 24v Digial I/O

I realized the 6i24 wouldn't work because it's not made for 24v I/O inputs (from what I could tell)

I may need more I/O - not exactly sure. Can you daisy chain 7i84's together?

Thanks to everyone for the help.

Based on your replies I'm confident my setup will work, if I do need more logic for my retrofit I'm confident I can just add the 7i74.

I'm building this controller replacement for my father, this is going to be his retirement hobby. I have a background in software engineering so I look forward to delving into the software side of things.

I recorded my setup of the PC / case and internal wiring / adapters to fit the existing/legacy connections (VGA/DB15 and IDC50).
There are some clever bits to make the interface between CNC and control pc clean and plug+play.

I filmed the setup, and I'm currently filming the software installation / mesa card setup - I'll post a link to Youtube when I'm done.

Thank you all, I'm sure I'll be back with more questions. In the future hopefully I'll be able to write up what I've done for those starting from zero like I was.