photoeye and relay selction
photoeye and relay selction
(OP)
I have a photoeye with a DC control output (PNP) of 100ma (26.4V) max. I need to interface it to a micrologix 1200 with a 120VAC input card. What kind of relay do I need to do this?





RE: photoeye and relay selction
RE: photoeye and relay selction
RE: photoeye and relay selction
OMRON PL08 (OCTAL SOCKET)
RE: photoeye and relay selction
RE: photoeye and relay selction
The relay doesn't change DC to AC.. It allows the 24VDC running your electric eye to make the relay activate(close a pair of contacts). You then provide AC power from your micrologix to one side of the relay contact and the other side of the relay contact goes back to the micrologix AC input.
Let me say, there are a whole Cr@p-load of problems you can get yourself into doing this. Your last question tells me you really need some skilled assistance even if it is just someone looking at the whole scheme and approving it.
RE: photoeye and relay selction
RE: photoeye and relay selction
I like the octal relay socket with round pins myself.
What frequency do you expect the photoeye to operate at?
Barry1961
RE: photoeye and relay selction
RE: photoeye and relay selction
Forget the relay.
Get a proper photoeye instead.
RE: photoeye and relay selction
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One day my ship will come in.
But with my luck, I'll be at the airport!
RE: photoeye and relay selction
AC sensors typically have poor switching frequency due to the 60Hz source. 25Hz will likely be at or near the max switching frequency for most AC sensors. I wouldn't want to rely on a sensor operating at its limits.
You could also look at a solid state relay, like the Omron G3NA. The G3NA-205B will switch a 5A load with a 24VDC input. (That's the lowest current rating). Looking at the specs it appears that it would take about 9ms to energize the output.
D
RE: photoeye and relay selction