On 07/24/2013 07:25 AM, propcoder wrote: > I am planning to control Delta VFD-B using RS232 to RS485 converter and > LinuxCNC, Modbus. Manual of the drive: > http://www.delta.com.tw/product/em/drive/ac_motor/download/manual/VFD-B_manual_en.pdf > > I feel cold when coming near to Ladder logic (I am an IT specialist, > programmer). Maybe I will learn it one day and feel as comfortable as > programming in C.. > So I was thinking starting from > http://wiki.linuxcnc.org/cgi-bin/wiki.pl?VFD_Modbus. > > BTW, which of these methods would be lighter on CPU recources? > > Maybe someone went this way already and could share some sources, configs? ... snip
The wiki page above is pretty old and I think libmodbus and the LinuxCNC packaging has had a few revisions that might not be compatible with some of the information on that wiki page. It should be better than nothing. I seem to recall that someone has made a generic style Modbus component, but I know very little about it. There would need to be a way to set register address space and map functions to each address. Some interesting work has been done, but the authors haven't published their work, nudge nudge. I started a three component system that had a HAL to Modbus, Modbus to hardware, and a communication controller. This was supposed to handle multiple serial ports and Modbus devices. I got it mostly working, but has been stalled for a couple of years. -- Kirk Wallace http://www.wallacecompany.com/machine_shop/ http://www.wallacecompany.com/E45/ ------------------------------------------------------------------------------ See everything from the browser to the database with AppDynamics Get end-to-end visibility with application monitoring from AppDynamics Isolate bottlenecks and diagnose root cause in seconds. Start your free trial of AppDynamics Pro today! http://pubads.g.doubleclick.net/gampad/clk?id=48808831&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
