S
Steinhoff
> Displaying a scrolling strip chart doesn't require efficient animated graphics. Your points are quite valid, but my own point was that a scrolling strip chart isn't very demanding. I do the same thing by the way in a web browser using SVG and Javascript, and CPU usage is also very low. <
OK ... I did a test on a LINUX machine. When you scroll more smoothly the CPU load is much higher ... but not so dramatically
> You said that "Ethernet Powerlink, EtherCAT, Modbus-TCP and EthernetIP are available by open source projects"
> Modbus-TCP is, without question open. With EtherCAT the specs were initially open, <
The specs of the standard IEC 61784 are open and will never be closed.
"EtherCAT" is a proprietary name of a product based on the fieldbus standard IEC 61784-2. You can't use the name "EtherCAT" without the permission of its owner ... IMHO, that's normal.
> but then the EtherCAT people changed their minds when and sent their lawyers after a university in either Belgium or The Netherlands (I forget which) and force them to close down their open source EtherCAT project. The EtherCAT people were demanding registration, licensing and certification (which the university wasn't willing to to pay). If that has changed back once again, then I would appreciate hearing about any information you might have on it. <
No, no this are simply fairy tales ... you can always use the source of this project without registration and certification:
http://www.etherlab.org/en/ethercat/index.php
But don't use the name "EtherCAT" !!
> For Ethernet Powerlink, I wouldn't mind any up to date information. <
Here are the links:
http://sourceforge.net/projects/openpowerlink
opensource Powerlink stack for LINUX, Windows und FPGAs
http://sourceforge.net/projects/openconf
open source configuration program for Powerlink
It's completely open !
---- snip ----
> If you know of a version of EthernetIP that is available under genuinely open terms, I would be very interested in hearing about it. <
Here is the link to the Ethernet/IP sources:
http://sourceforge.net/projects/opener (partial implemention) ... but the "openness" of that licensing is indeed very strange
Best Regards,
Armin Steinhoff
OK ... I did a test on a LINUX machine. When you scroll more smoothly the CPU load is much higher ... but not so dramatically
> You said that "Ethernet Powerlink, EtherCAT, Modbus-TCP and EthernetIP are available by open source projects"
> Modbus-TCP is, without question open. With EtherCAT the specs were initially open, <
The specs of the standard IEC 61784 are open and will never be closed.
"EtherCAT" is a proprietary name of a product based on the fieldbus standard IEC 61784-2. You can't use the name "EtherCAT" without the permission of its owner ... IMHO, that's normal.
> but then the EtherCAT people changed their minds when and sent their lawyers after a university in either Belgium or The Netherlands (I forget which) and force them to close down their open source EtherCAT project. The EtherCAT people were demanding registration, licensing and certification (which the university wasn't willing to to pay). If that has changed back once again, then I would appreciate hearing about any information you might have on it. <
No, no this are simply fairy tales ... you can always use the source of this project without registration and certification:
http://www.etherlab.org/en/ethercat/index.php
But don't use the name "EtherCAT" !!
> For Ethernet Powerlink, I wouldn't mind any up to date information. <
Here are the links:
http://sourceforge.net/projects/openpowerlink
opensource Powerlink stack for LINUX, Windows und FPGAs
http://sourceforge.net/projects/openconf
open source configuration program for Powerlink
It's completely open !
---- snip ----
> If you know of a version of EthernetIP that is available under genuinely open terms, I would be very interested in hearing about it. <
Here is the link to the Ethernet/IP sources:
http://sourceforge.net/projects/opener (partial implemention) ... but the "openness" of that licensing is indeed very strange
Best Regards,
Armin Steinhoff