Bullzi, I am trying to create a work around for a process technology level sensor.
http://www.processtechnology.com/pdf/LC.pdf
I would love to just go from a sensor to the PLC. But I have a process that has fluid at 190 degrees and I cant find a level sensor that can REALLY stand up to the heat. Except these sensors. But the cost to replace every sensor on my line is $20K plus.
So the reason for my attempt to create a workaround. DougP and Firejo, those are great ideas I will work on coming up with something that will work using your input. Thanks guys!
If you DON't use the electronics and relay that is made to work with the level probe, you will end up with costs up to the wazoo! Trying to fix a jury-rigged cobbled-up system is always more expensive than doing it right at the beginning. Most likely, the level switch electronics has a timed decision circuit that decides when or if a varying or intermittent conductivity is showing the true level. You will have to somehow reinvent that in your MicroLogix 1000 program (reinventing the wheel that you decided not to buy to save on costs). The ML1000 analog inputs are not very high-resolution, so that is a strike against your plan, plus you only get about 2 analog inputs per ML. To make it work without the factory electronic control package, you will have to duplicate the impedance of the circuit, convert the 14.5 VAC signal to a 0-10 or 0-5 volt DC signal, hope for the best, and spend many hours reinventing what Process Technology spent years developing.The reason I don't want to use the electronics is cost.