Mesa 5i25+7i77 plug-n-go configuration

More
02 Jul 2012 19:15 #21499 by doug6949
Thanks Chris;

I'm thinking along the same lines - just get XYZ running and worry about the rest later. My plan is to use the knee for tool length offsets. I haven't got a servo on the knee yet, nor am I ready to mount the spindle encoder. Just need to get it running.

The computer is a 7X8X12 ITX box ...

www.arktechinc.com/pi01/pi01.htm

... which will be mounted to the door of the cabinet. The ability to put the daughter card near the incoming I/O lines will make this an easy build.

Doug

Please Log in or Create an account to join the conversation.

More
02 Jul 2012 19:17 #21500 by PCW
Also for hand configuration:
halcmd show pin >mypinlist
and
halcmd show param >myparmlist
and using mypinlist and myparmlist
as source files for cut/pasteing into a hal file
are a big help with long pin and parameter names

Please Log in or Create an account to join the conversation.

More
02 Jul 2012 21:03 #21504 by doug6949
I just ordered the 5i25/7i77/cable kit so I have about a week to read the manuals. So far I'm encouraged. The 7i77 should cut my wiring time in half. That alone justifies the expense for me.

Thanks

Please Log in or Create an account to join the conversation.

More
26 Jul 2012 22:46 - 26 Jul 2012 22:47 #22499 by FloppyDisk
cmorley wrote:

As for using PNCconf.
First you must use the buildbot version of linuxcnc - it has the latest bug fixes - which is required to use PNCconf on the 5i25.
also you must add the firmware descriptions manually - not a big deal - see here:http://www.linuxcnc.org/index.php/english/component/kunena/?func=view&catid=39&id=20043


The link for www.linux.cnc.org/... catid+39&id=20043 is not working for me? Other links do work. I searched the forum with just the term 20043 and couldn't find it either? Is it still pertinent to this discussion?

I receive an error: Invalid post ID was requested??

thanks,
Mark
Last edit: 26 Jul 2012 22:47 by FloppyDisk.

Please Log in or Create an account to join the conversation.

More
26 Jul 2012 22:58 #22500 by andypugh

Please Log in or Create an account to join the conversation.

More
11 Oct 2012 23:11 #25256 by gandalf69
I asked Peter at Mesa these questions a few days ago but so far no reply.
Maybe better to ask here anyway.

I will be attempting to learn about the various software to drive this mill whilst a long way away from it and so I will have no access to the machine hardware.

The manual states that :
"The isolated field I/O on the 7I77 runs from a switching power supply that can be
powered by field power or a separate supply (VIN) with ground common with field power.
Normally the 7I77 field I/O logic will be powered with field power and an on card jumper,
W1 allows VIN to be connected to field power".

1) So would using +12v from the PC power supply be OK for VIN and field I/O logic?


2) Would it be possible to simulate input to an encoder input with, say, a HAL oscillator (output to an I/O and then wired to an encoder input)?

The analog servo output could presumably be monitored with HALscope/meter.

Please Log in or Create an account to join the conversation.

More
11 Oct 2012 23:37 #25258 by PCW
Yes PC 12V is fine for field I/O though you lose the benefit of isolation
(normally CNC machinery to be retrofitted already has a 12V or 24V supply for this purpose)

Not sure why would you simulate an encoder input

Note: you must not connect anything but 5V signals to the 7I77 encoder
inputs, so field outputs are not suitable if you want to try a loopback experiment

The analog out is typically driven by the PID components output
which can be monitored with HALScope for tuning purposes

Please Log in or Create an account to join the conversation.

More
12 Oct 2012 08:58 #25262 by gandalf69
PCW, thanks for your reply.

As I said:
I will be attempting to learn about the various software to drive this mill whilst a long way away from it and so I will have no access to the machine hardware.

Hence the desire to simulate an encoder etc.

The encoder input spec says Common Mode Range -7 to +12V. Absolute voltage is not specified so I just assumed 12V was OK.
Now I know it will not do it I can make up a voltage divider for loopback.

Please Log in or Create an account to join the conversation.

More
12 Oct 2012 10:13 #25263 by andypugh
gandalf69 wrote:

2) Would it be possible to simulate input to an encoder input with, say, a HAL oscillator (output to an I/O and then wired to an encoder input)?

www.linuxcnc.org/docs/html/man/man9/sim_encoder.9.html
It would be entirely plausibele to hook this up to the parallel port to create suitable signals to drive the Mesa card.

Alternatively you could use an actual encoder or something like an Arduino.

Please Log in or Create an account to join the conversation.

More
12 Oct 2012 11:02 #25265 by gandalf69
andypugh,
thanks, that sounds like what I was thinking.
I'll see if I can get it to work for me when I get into learning HAL.

Please Log in or Create an account to join the conversation.

Moderators: cmorley
Time to create page: 0.195 seconds
Powered by Kunena Forum