PLC's and slip rings
PLC's and slip rings
(OP)
Does anyone have any experience using slip rings with PLC's?
whose did you use? and how much data interference was there?
whose did you use? and how much data interference was there?
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RE: PLC's and slip rings
Can you tell me more about your problem ?
<nbucska@pcperipherals.com>
RE: PLC's and slip rings
I'm not really sure about wireless, due to a significant amount of noise already in existance.
What did you have in mind??
RE: PLC's and slip rings
Power you can filter or xmit through a rotating xformer.
Is the signal bidirectional ?
<nbucska@pcperipherals.com>
RE: PLC's and slip rings
bi-directional would be a definate.
How would I go about picking a transformer?? I'm pretty good with basic electrical and electronic stuff, just not very familiar with basic technology available to know how to apply it.
RE: PLC's and slip rings
The other way you may use concentric IR link.
<nbucska@pcperipherals.com>
RE: PLC's and slip rings
If you are dealing with process critical or safety related I/O, I would not recommend this method. In that case, I would agree that wireless is probably the best bet.
RE: PLC's and slip rings
Consider MERCOTAC mercury-wetted slip rings (available in McMaster-Carr!) and multiplexing your I/O before & after the slip ring. Power should be conditioned on the receiving end of a more standard copper/graphite or silver based ring set (which would surround the MERCOTAC). This was used successfully in a specialty theater crane which carried live performers overhead at the MGM/RIO Casino in Las Vegas, Nevada.
--Steve
RE: PLC's and slip rings
What do you do about the Hg. vapor ?
<nbucska@pcperipherals.com>
RE: PLC's and slip rings
Thanks for the idea...
Unfortunately this will be used in food processing and those darn FDA people have a problem with Hg...
RE: PLC's and slip rings
You have to understand the problem completly, before you can really suggest a solution.
<nbucska@pcperipherals.com>
RE: PLC's and slip rings
RE: PLC's and slip rings
RE: PLC's and slip rings
RE: PLC's and slip rings
They also had a web based control demo (real time) at there web site. If noise is really bad you may be able to run the transmition signal thru the slip ring assembly via suitable wire and bring it right to the area of other transceiver or possibly direct link them.
RE: PLC's and slip rings
What is the rotational speed, what is the input/output
requirement, if the controller is on the rotor ?
What is the number of inputs/outputs and what is
their speed?
Does the interface must work before it is spinning ?
<nbucska@pcperipherals.com>
RE: PLC's and slip rings
RE: PLC's and slip rings
After speaking with a couple of EE's who have worked with the older technology of the machine I'm designing, we've come up with the solution that we need to supply power to PLC's on board, making them slaves, and have an additional PLC located elsewhere to control the rest of the machine and interact with the rest of the production line.
Back to the original question...
I am looking to you all for your experiences utilizing PLC's and slip rings. Although I am leaning towards AB for PLC's, nothing's written in stone.
There are quite a number of manufacturer's out there. I was looking for proven combinations.
Sorry if we got off track back in the beginning.
RE: PLC's and slip rings
The roll ring easily handles currents to 10 amps per circuit or if using multiple flexures in each circuit higher currents can be achieved. It has resistance noise less than 5 milliamps and lasts for a long time without maintenance. In addition, multiple flexures can be inserted into the circuit to further reduce the noise. The roll ring can be tailored to your application by stacking circuits and using more than 1 rolling flexure per circuit.
RE: PLC's and slip rings
RE: PLC's and slip rings
Pasavant,Prussag Noel.
they have good expereince with PLC,Analog-Digital signals
in rotating machines.(water treatment plants)
RE: PLC's and slip rings
Anyway In the wire and cable industry we have had experience with data communication (AB PLC's) transferring critical information at 800 RPM and no we did not utelize RF.
Rick Nieuwnhuysen]
Engineering Manager
RE: PLC's and slip rings
Whose slip ring did you use? AB recommends 2 mfr's, but I'm not sure they have what I'm looking for.
schick
RE: PLC's and slip rings