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Schick: I have already written a reply to this thread in the Automation & Robotic Engineering forum - I believe the real answer here is a wireless Ethernet link, using the slip rings only for the power required for machine and PLC (and perhaps a hard-wired E-Stop).

Schick: I have had some experience with control and power wiring going into and out of rotating machinery; the machine was a strander, a machine which took individual copper strands (usually 19) and wound/stranded them onto one large reel. The data and power transfer was accomplished with...

mag100: The DC Variable Speed Drive will not just put out the specified voltage, but will actually act as a current source to supply the desired field current (the current is the important value here). Make sure and put this parameter (field current) in correctly; I have changed DC motors...

IngoFederle: I did a search and found a website with a document written for the U. S. Department of Energy Multilaboratory Project "Spallation Neutron Sources". It is fairly new, written 12/21/2000, and uses up-to-date plc's, A-B ControlLogix and SLC-500 family. The language is...

Nice tip, techshoot. Another example, which I have written for the 90-30 GE/Fanuc plc, is a subroutine I named "UP_SCL", which takes a value from 0 - 100 (for instance a motor speed, stopped to wide open) and turns it into an equivalent 0 - 32,000 integer, which the GE plc uses for...

shyam: There are several vendors who offer both plc and HMI programs - these use a common database (or tag dictionary), which takes a lot of the extra work out of the equation. GE/Fanuc sells both VersaPro plc software and Cimplicity HMI, which use a common database; Rockwell...