Another Biesse Rover 322

P1 is 24vdc.
You can see that in the beginning of the schematics and on the modules. That is what Biesse labels the first iteration of 24vdc.
The P1 is what ios powering the digital side of the drive.

Those modules are the RS485 modules that you cannot use. Those are inputs and outputs. 
You need to provide a relay for each of those outputs and the inputs you can take directly into 7i77 if you are using the 24vdc from tyhe 3 phase rectifier in the machine. You need to watch which voltage you are using.

 

The N and P1 is the 24VDC for your drive logic. The inputs in the drive needs the 24vdc common to see an input.

P1  -  +24vdc
N    -  com

Your ideas on VIN and field power are not ok. I just went back and read them. VIN is logic power and P1,P2,P3 is the same power but different iterations. You get get P2 and P3 after some logic or when it passes through a relay. Would have to look in your schematics but you really need to look at this setup carefully. 

 

Thanks for pointing this out! You're right, I carelessly assumed P1 (of course 24V) would just "be there" (from the rectifier) when the machine is turned on and P2 and P3 when the machine was put on enable. This is not what happens!
I'm not 100% certain on all of it yet, need some more time to think it through and study the schematics and machine. So please don't pull your hair on my lack of understanding, it takes me some time, sometimes.

I'll have a friend (knowledgable electrician) come over if I can't figure it out, before I hook anything up.

However, by now I realized that the original power supply inside of the original RT480 control comes into play somehow. Since this will go, I need another source of 24V, which should power all of the Mesas VIN and possibly the 7i77's VFIELD too. VFIELD of the other cards could then be P2 and P3 I guess? So the question is where I take this 24V from - from the machines rectifier before all other logic, or from a separate, added, power supply. As I said, still trying to get it together.

Still trying to wrap my head around the labeling of the power supply, why there is 21 V AC and what some things in the schematics are. I'll need to have a fresh look tomorrow, at the machine. I've been staring at page 43 of the schematics for a while...
   

Re: modules in the cabinet (which both have relays outputs): I already have some Finder DIN rail relays, they work nicely with the Mesa cards (tested).

On another note, the 7i77 looks great in there
 

Hi,

I too have a 322 building in MESA 7I76 and 7I77 to replace the controller

Did you conclude what the 21V AC was for?

I have attached an inkscape file with labels for the mesa boards (7I76 7I77)  if anyone is interested.  Print them out as A4, and attached to the green and orange plugs on the board.