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open-hardware-plc-tlc This means that the input PA1 is activated open hardware plc tlc 5 volts when our 24 volt sensor is activated. TLC grows more plants locally than any other garden center in Oklahoma. The boards could be sold and people could design their own cases and stuff. PLC join leave 28, readers users here now Description This sub is dedicated to discussion and questions about Programmable Logic Controllers PLCs : "an industrial digital computer that has been ruggedized and adapted for the control of manufacturing processes, such as assembly lines, robotic devices, or any activity that open hardware plc tlc high reliability, ease of programming, and process fault diagnosis. One of the most popular veggies.

The LED works by emitting light when connected to a power source and the phototransistor opens up for current flow when exposed to light. Let me illustrate how the optoisolator works by drawing a simple electrical circuit of a microprocessor input:.

The voltage we use for our sensor is 24 volts. When we connect the signal wire on the sensor to the PLC input terminal we are in fact connecting it to an opto-isolator. So, when the sensor is activated we will have 24 volts activating the LED inside the opto-isolator.

The phototransistor will then be activated by the exposure of light. The 5 volt circuit for the microprocessor is connected to the phototransistor in the opto-isolator. This means that the input PA1 is activated with 5 volts when our 24 volt sensor is activated. The idea of using an opto-isolator is to isolate the two circuits to protect the microprocessor from high voltages.

Most opto-isolators can take a peak voltage of several kilovolts, and that will be the protection of the inputs on the microprocessor which usually operates at volts. Microprocessors have the same problem with outputs as with inputs.

An important part of the output electronics is the opto-isolator, just like in the input electronics. The function of the opto-isolator here is also to isolate the two electrical circuits.

The 5 volt circuit for the microprocessor and the external circuit for the outputs on the PLC. As you can see the power supply used to supply the load connected to the output L is an external power supply. The optoisolator is again used to isolate the internal PLC circuit from the output circuit. Of all the PLC hardware the first one you always have to connect is the power supply. Make sure you do it right and be careful because you can destroy the PLC.

Answer: Always look in the datasheet of the PLC. You will find all the information about the necessary power source and other useful data about the PLC. I'd bet not a single person would use that over a PC. It is tedious if you want to do something with a certain degree of complexity. Still, these small devices I listed Zelio, Logo, etc have this ability and it is useful as it serves different purposes: when you are not programming the device, you can use the screen and the buttons as an interface for your device to let the user watch a variable or set a parameter.

I should have mentioned I'm also quite interested in teaching applications. With the Zelio we built a few toys we gave the students to play with: one, for example, had the PLC, a stepper mottor and a few buttons, and you had to program the Zelio to control the motor not practical but still useful to learn ladder. I've actually looked into this in the past myself, and found very little.

I even considered trying to do something myself, but it was never a priority. I think I saw some stuff on www. I'm looking at something simpler than that, probably a single board device. I did a quick search around again on my lunch break and on Hackday they have a PLC tag, but there aren't a whole lot of project under it. Still might be another place for you to start looking:. Use of this site constitutes acceptance of our User Agreement and Privacy Policy.

All rights reserved. PLC comments. Want to join? Did you miss your activation email? This topic This board Entire forum Google Bing. Print Search. Pages: [ 1 ] Go Down. FalconeG Newbie Posts: 2 Country:. Every maker can develop hardware and software solutions to works on YABA platform. We just launched our Indiegogo campaign and we would love like to receive not only backing, but also suggestions, criticism and development ideas.

Interesting offering. A couple of thoughts: If the platform doesn't support ladder logic it is pretty much dead Open Hardware Plc Error in the water. I know that this is uncommon these days but it sure does make field maintenance a lot easier. Also in some organizations it is common to have a separate input supply and an output supply.

Adding an expansion card to get a couple of inputs and outputs doesn't cut it in practice. Frankly this means at least 16 inputs and 8 outputs. USB sucks for ruggedness. You need to pay attention to the strain put on Open Hardware Plc Keyboard the connector. Just some things that popped into my head after giving the site a quick skim. How resilient is it?

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