On 8 May 2013 23:09, john d norton <[email protected]> wrote: > I would have too much io on the intended machine for just the p port > > I was wanting to use the Mesa 5i25 7i76 png kit
In that case you might want to discuss with Mesa. it is entirely possible that there is an easy way to make the 7i76 24V-compatible. > Then the strip board with uln chip - is there anything else to go with > the chip apart from the required connectors > Is it just a case of field power to the chip signal to the chip and > output from the chip Pretty much, yes. The ULN is a switch-to-0V device, though, which requires a bit of mental gymnastics if you are used to thinking about +5V = yes 0V = no. You need to think in terms of current flow through the optos on the drive inputs. So +24V from your PSU goes to the + terminal of the input, the relevant pin of the ULN connects to the - terminal of the input, and the common ULN Earth/ground pin connects to the PSU 0V. When there is 5V on the ULN input pin, then there is current flow into the output pin to earth, the LED in the opto lights up, and a signal is seen by the drive. The ULN2003 is capable of 50V and 0.5A per output. -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto ------------------------------------------------------------------------------ Learn Graph Databases - Download FREE O'Reilly Book "Graph Databases" is the definitive new guide to graph databases and their applications. This 200-page book is written by three acclaimed leaders in the field. The early access version is available now. Download your free book today! http://p.sf.net/sfu/neotech_d2d_may _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
