On Sat, 2011-09-24 at 10:14 +0300, Viesturs Lācis wrote: > Hello, gentlemen! > > I would like to ask, if anyone could share their experience with Omron > V1000 VFD. More specifically, I am interested in getting the drive > communicating with EMC through Modbus. Is there anything specific to > know or to avoid? > > Thanks in advance! > > Viesturs
It has been a while since I played with Modbus, but Modbus is a standard for communication and partly the internal working of devices. The communication may be through a serial port or Ethernet. The internal part is a loose register configuration. Each device will need a custom driver covering the register assignments. Documentation for the device will be needed. Serial and Ethernet is in user space, so is non-realtime which might be fine for a spindle. Checking for the spindle speed status might be an issue, there should a HAL component for this. Basically, one should start with one of the existing drivers and modify it to match the registers of the device in question. There are a few links that started covering VFD Modbus, but didn't get too far: http://wiki.linuxcnc.org/cgi-bin/emcinfo.pl?VFD_Modbus There is a subtle difference between the different sample drivers. I seem to recall the difference is in where the sources are and how to compile them, either as a HAL component or compiled in EMC2. I may be able to dust off some of the little gray cells if more information is needed. It would be a good thing if I or someone else would bring the wiki up to date on this. Another issue is that Modbus is rather old and may not be useful sometime in the future. Off the top of my head, real-time might be had with a parallel port connection to an AVR/Arduino to convert to Modbus, which could solve some of the communications timing issues, ... or not. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/index.html California, USA ------------------------------------------------------------------------------ All of the data generated in your IT infrastructure is seriously valuable. Why? It contains a definitive record of application performance, security threats, fraudulent activity, and more. Splunk takes this data and makes sense of it. IT sense. And common sense. http://p.sf.net/sfu/splunk-d2dcopy2 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
