What is the target audience for the class? You will have a good understanding of manufacturing systems as a whole.You will be able to create simple Human Machine Interface (HMI) screens and controlling them via a PLC. ![]() You will be comfortable creating basic ladder logic programs and troubleshoot complex existing ones.You will have a good understanding of what a PLC does, how it does it as well as what the outcomes of those actions are.The main objective of this course is to get you job-ready by the time you finish the last lecture.If that's not possible, I would advise spending some time working with an emulator and browsing through data sheets and manuals which will be presented to you in the course. You don't need any hardware or software to follow the lectures, however, it is highly recommended to get some practice before going into an interview.As some one who has administered interviews to PLC technicians, these questions are crucial in making sure that you've understood the material presented. These lessons are designed to strengthen your knowledge of PLCs and give you an edge during interviews.Īt the end of each section, you will face a quiz which will allow you to test yourself on the material you have learned before moving to the next section. We will take a much deeper dive with hands on labs and practice sessions during which I will give you specific real world scenarios to work with and give you tips and common pitfalls. We will cover basic topics such as what a PLC is used for, how it is able to receive and process Inputs & Outputs. In this class, you will learn absolutely everything necessary to land a job as an entry level PLC technician (engineer, etc.). Showcase several completed projects to an employer.Understand how a Programmable Logic Controller (PLC) works.Consequently, when the main motor shuts off, the blower (on the DN bit) shuts off later.Īs an illustration, let’s take a look at how you would see this timer in logic. When the motor energizes, the blower energizes. For example, you might use this timer on a motor that has a blower to keep it cool. ![]() When the TOF goes false, the DN bit remains on until the accumulated value reaches the preset. When the timer goes true, both the EN (Enable) and DN (Done) bit come on. TOF - Timer Off DelayĪll things considered, the TOF is the most difficult timer to understand because of it’s operation. After 5 seconds, T4:0/DN becomes true, and O:000/0 will energize. When I:000/0 goes true, the EN bit goes true, and the timer begins to time. This will give you the preset in seconds.Īt this point, let’s take a look at 2 rungs of logic: Obviously, this would limit the number of nuisance alarms.Īs far as the preset goes, multiply the value in the preset by the time base (1 or. You might want to sound an alarm only if the condition goes true for 2 seconds. You might use this timer to delay a conveyor from starting while a horn blows. For the TON, however, the DN bit only goes true after the timer has timed out, and the rung is still true. Any time the accumulated value is incrementing, the TT (Timer Timing) bit is true. Keep in mind that for timers, any time the rung is true, the EN (Enable) Bit is true. On the whole, the TON is the most widely used timer. For the most part, it’s a good idea to have a few spare timers available in case you need to use them while your system is running. With this in mind, you cannot expand the data file if the processor is in Run or Rem Run mode. As you can see, I’ve expanded the number of timers by clicking “Properties” at the bottom of this window. At anytime, you can monitor the memory usage under “Controller properties”.įor example, let’s open the T4 Data file. Keep in mind, though, that you do have a limitation on the processor memory. Go to properties, and you can create up to 1000 timers (0 to 999). It’s important to realize that you can expand this data file. By default there is one timer, which is T4:0. ![]() In this case, let’s open the T4 data file. Our data files appear in the Project Tree at the left of your environment.
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