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Got it working with the following code.
Used "ENC1" and Encorder.3.
Also moved the jumper to "Signal ended encoder" on the Mesa 7i77.



 

Has two rotary encoders. Which I intended to use as a feed/spindle override. Can I use encoder input 3/4?


 

Hi, i wish a Merry Christmas to all the linuxcnc community.I have been working for almost a year on the mecanical aspects of this retrofit.New turcite, scraping, spindle bearings, adapting new servos on axis and so on...Now i just finished the wiring of the servos and spindle motor/drive.It's time to hook up linuxcnc and mesa cards with the following combo :7i80db 7i77 7i76 7i73.

I use servostar S600 drives from Kollmorgen on all axis and i would like to control them in velocity mode with the analog /-10 of the 7i77 card.The position loop is done with encoders mounted on the ballscrews and connected also to the 7i77.
I'm really confused in the way the analog interface is described in the 7i77 manual.  
If i get it right the wiring would be:
servostar Analog-in 1+  ---> 7i77 AOUTN
                Analog-in 1-   --->7i77 GNDN(adjacent to AOUTN)
                AGND            --->7i77  ?
Firstly it seem's there is a confusion in the in the manual between GNDN(in the descrition of the interface) and GND(connector description).
I'm searching which 7i77 terminal would be called  CNC-GND from the servostar point of view and also to what terminal attach the shielding?

The spindle drive is Siemens sinamics S20.
Due to its ability to be driven in bipolar analog mode i would like to control it with 7i77 analog output to try to achieve M19 orientation with spindle encoder hooked to 7i77 or 7i76.
Siemens V20 Al 1  ---> 7i77 AOUTN
                   0V       ---> 7i77 GNDN(adjacent to AOUTN)
                GND       --->7i77  ?
Again i'm confused with how to wire up the digital ground and the shielding.

Thank you in advance for your support!

 

JamesHoward wrote:

I dont need an interface board. what i need is for linuxcnc to connumicate via an ISA bus to tell the Galil where it is going next. 

ISA bus = very, very old, i think i have some of those collecting dust somewhere, although i never looked what make/model as they are ISA...Have some PCI also collecting dust.
I am not aware of anything regarding LinuxCNC for ISA bus (might be, though), so short of writing a driver for it (no idea how hard it is but from what i read on this forum not very hard), it is a no go.
So in short, yes you do need an interface board, a Mesa 7i97 would be nice if you can find it, but if you can not, then a 7i92T or 7i96S with a 7i77 will do the same for 5 axis plus spindle (spindle can be used as servo, so 6 axis).

Mesa 7i77 has 5 ENA controlled by the same pin, and the spindle ENA controlled by a separate pin, as you have mentioned, so yes those are separate, but i can no recal if the ENA work with only spinena or does it also need spindle speed somewhere somehow, sorry been a long time.
Those ena are optocouplers so i never ever wire relays to them, i wire those directly to drive enables.
-
Even if those ena are gone you can route those pins to any output on the mesa boards, or have both of those or almost whatever it may be required.
ExampleNotice the X enable goes to a Mesa 7i71 output and the rest to 7i77 outputs, so any combination will work, depending on your hardware.

I'm a new user working my way through commissioning a retrofit of a 3 axis Mill (DeckelFP4NC) with a Mesa 7i92/7i77/7i74 setup, Linuxcnc V2.9.1, Axis GUI. The mill has DC brushed servo motors and I'm using Parker 514C servo drives with an active high enable and -10V to 10V speed setpoint analog input.

I'm not getting any voltage output from the 7i77 ENA signals to enable the servo drive in response to the analogena pin being set high.

Initial setup: 24V to ENA0 , ENA0- to A1 of relay coil, A2- of relay coil to GND. The enable relay didn't turn ON in response to setting hm2_7i92.0.7i77.0.1.analogena high - confirmed in the HAL watch window. I think I may have damaged the 7i77 optocouplers by connecting the ENA- to a relay with a coil current greater than the 50mA specified in the 7i77 manual.

Troubleshooting:
1) I've checked that there's 24V on ENA0 and connected ENA0- to a spare input of the 7i77 (hm2_7i92.0.7i77.0.0.input-31) but don't see this pin change in response to the analog enable.
2) I've shifted the wiring to ENA5 and repeated the test there using the spindle enable pin hoping that the spindle enable might be separated from the other optocouplers - but no response on the input to setting the spindle enable pin high.

Is there anything else I can try before ordering a new 7i77 card?
I've attached an extract from the HAL file used with the analog enable and 7i77 input combination (1).

Thanks in advance for the help - the forum has been a huge help in getting this far. 

Three questions:
Can the RS422 on 7i77 be used as encoder input for testing until I get 7i74 board delivered?
I am told BISS and SSI though very similar, can't be used interchangeably. I wanted to know which encoder should I order: BISS protocol or SSI? 
I would have three absolute linear encoders, one rotary absolute encoder and one spindle incremental encoder. Is 7i74 better than 7i85 for the my setup?