text: <s>[INST] Number of PowerFlex 7 series VFD's on ControlNet We are just working on a new installation in which we need to put a number of PowerFlex VFD's (700VC, 700S & 7000). on ControlNet. The VFD's will be the only devices on this network and we will be using a CN2 in the PLC rack for communications. We have done a trial in RSNetworks for ControlNet and the result are seemed to indicate that 50 VFD's would be fine (NUT 5ms & 80 ms RPI). Does this sound reasonable? [/INST] If you go in RSNetworx for Cnet, in offline also, in the project that you are trying, press the right mouse button on the CN2 icon, select properties and go to the Controlnet tab; there, have a look to the peak and average scheduled usage.These values (percentage) should be less than 80%, preferrable less than 70%.Also have a look to the total scheduled bandwidth of the network with the same limits in your mind.Eventually adjust your NUT and RPI to have these value correct. Maybe useful to read this technote on this:http://rockwellautomation.custhelp.com/cgi-bin/rockwellautomation.cfg/php/enduser/std_adp.php?p_faqid=8479 Anyway,your network sounds reasonable. :smileyhappy: Also be careful to the limit of 48 taps per segment and total length of it, you'll need a repeater in your network... split the total number of drive into two segments. Here a link to the coaxial cable planning guide:http://literature.rockwellautomation.com/idc/groups/literature/documents/in/cnet-in002_-en-p.pdf Hope this helps... :smileyhappy: - fuzzy logic \\n </s>