On 2/26/2012 3:47 PM, Kirk Wallace wrote: > Why does LinuxCNC's Ladder have a Modbus slave? Does anyone use it? I'm > looking into using it for testing a LinuxCNC TCP master, but wondered if > it might be used elsewhere. I'd also like to get an idea of how many > people use PLC's and/or ModbusTCP with LinuxCNC. >
I think the Modbus slave (Modbus server) only works in TCP mode. I have never tried it but it could be very useful for linking two LinuxCNC boxes. I have tested the TCP master but never used Modbus TCP on an actual application. Most of my LinuxCNC applications include a PLC as the I/O is cheap and flexible but I usually use a RS232 or RS485 link. The external PLC allows some of the processing to be offloaded to the PLC for functions external to the CNC functionality. I think the Modbus TCP slave functionality was part of Classic Ladder so it was integrated along with the rest of the Classic Ladder package into LinuxCNC. Chris Morley would know a lot more than I do about the history. Dave ------------------------------------------------------------------------------ Virtualization & Cloud Management Using Capacity Planning Cloud computing makes use of virtualization - but cloud computing also focuses on allowing computing to be delivered as a service. http://www.accelacomm.com/jaw/sfnl/114/51521223/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
