Mechanical Rotary Cam Switches Vs. PLS

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Thread Starter

Crystal Majercik

Hello Listeners,

I am presently looking at what "added value" there is in using a
Programmable Limit Switch over the traditional Mechanical Rotary Cam
Switches. I am also looking for your inputs as to who has the most reliable
PLS controllers on the market -- based on experience in applying a
supplier's product. Any additional information on the suppliers ability to
stand behind and support their product(s) is also of help.

Your opinions are valued...

Crystal - I2T
 
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Gilles Allard

A PLS is generally more flexible and reliable than a cam-switch.
ElectroCam and AutoTech are manufacturers of PLS but you may
search the WEB for a longer list.
I generally prefer to implement the PLS functionality in a PLC.
If your PLC has a resolver interface, that a good choice.
An absolute encoder is also a good choice and it only requires
normal discrete inputs.

Gilles
 
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Toto Arbi (TRB)"

diferent fuction only, The switch as signal aqcuition or sensor for logic control and alarm as indicator

thanks
TRB
 
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Bruce Durdle

Think about the difference between a TT, PT, LT and a TI, PI, LI. The transmitter or switch converts the process condition into an electrical or pneumatic signal: the indicator or alarm converts the electrical or pneumatic signal into a form the operator can use. With an alarm there is baggage such as latching, accept/reset provision etc.

Bruce.
 
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