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Description:Contact and Coil Contact and Coil | Nearly In Control Home About RSLogix 5000 Tutorial Creating a New Project Customizing the Editor and Colors Adding I/O Cards Creating an Axis for the Servomotor Pro

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Contact and Coil Contact and Coil | Nearly In Control Home About RSLogix 5000 Tutorial Creating a New Project Customizing the Editor and Colors Adding I/O Cards Creating an Axis for the Servomotor Program Structure: High Level Program Layout Program Structure: How to Layout Routines Mapping Your Inputs Mapping Your Outputs Create Fault Logic Create Low Level Machine Control Routines Create the Automatic Sequence TwinCAT 3 Tutorial TwinCAT 3 Tutorial: Introduction TwinCAT 3 Tutorial: Quick Start TwinCAT 3 Tutorial: Structuring PLC Data TwinCAT 3 Tutorial: Persistent Variables TwinCAT 3 Tutorial: Structuring PLC Logic TwinCAT 3 Tutorial: Multiple Virtual PLCs TwinCAT 3 Tutorial: Ladder Logic Editor TwinCAT 3 Tutorial: Writing your own Functions and Function Blocks TwinCAT 3 Tutorial: Structured Text TwinCAT 3 Tutorial: Building an HMI in .NET TwinCAT 3 Tutorial: Introduction to Motion Control TwinCAT 3 Tutorial: Introduction to TwinSAFE TwinCAT 3 Tutorial: The Scope View TwinCAT 3 Tutorial: Part Tracking Patterns of Ladder Logic Programming Sealed in Coil State Coil/Fault Coil Start/Stop Circuit Set/Reset Flasher Debounce Input Map Step Mission Five Rung Mode Mail RSS Toggle posts A A+ A++ Sponsored Links Categories .NET Automation Home Automation Industrial Automation Software Uncategorized Blogroll ArchestrAnaut Arduino Ladder Logic Beckhoff Open Source (GitHub) Got TwinCAT (ru) Harold On Controls Moms4mom One Robotics Company Blog SoapBox Automation SoapBox Core TwinCAT 3.1 What's New Meta Log in Entries RSS Comments RSS WordPress.org More Control Systems Found Attached to the Internet No comments · Posted by in Home Automation, Industrial Automation The User Interface Makes the Difference, Except in Automation 2 Comments · Posted by in Industrial Automation On Helping No comments · Posted by in Uncategorized Automation and Software in the Next Decade 2 Comments · Posted by in Automation, Software The Payback on Automated Unit Tests 4 Comments · Posted by in Software Estimating Software Projects 1 Comment · Posted by in Industrial Automation Control System Security Dilemmas 1 Comment · Posted by in Industrial Automation Apr/17 1 “X-Year Old” is a Categorical Variable No comments · Posted by Scott Whitlock in Uncategorized Just a quick note to parents out there: when someone says “3-year old” it refers to any individual who is from 3 years of age to 3 years and 364 days of age. It’s a categorical variable. The average “3-year old” is 3 years and 6 months of age. All of the measured “norms” of what a 3-year old can do is based on children who fall in that age range. So if your 3-year old is one month away from his 4th birthday, it’s not OK to refer to him as a 4-year old just because he’s “almost 4.” He’s still closer in age to the average 3-year old than the average 4-year old, so you’re inadvertently comparing him to a group of children who are older than him, and you’re naturally going to feel like he’s falling behind. In unrelated news, my 3-year old son is almost 4. ?? deep-thoughts · frustrations Mar/17 26 PLC Programming goes Imperative 3 Comments · Posted by Scott Whitlock in Industrial Automation Decades ago, computer science emerged from the dark ages of assembly language programming and created two new languages: Lisp and Fortran. These are two very important computer languages because they exist at opposite ends of an imagined spectrum in the eyes of computer scientists: functional languages vs. imperative languages. Fortran “won” the first battle, not least because imperative languages are closer to how the CPU actually does things, so back in the day when every little CPU cycle mattered it was easier to understand the performance implications of a Fortran program than a Lisp program. Plus, if you were already programming in assembly, then you were already thinking about how the computer was executing your code. In fact, the next big imperative language, C, is often referred to as “portable assembly language.” Fast forward to now, and modern languages like C#, Java, Python and Ruby have all grafted a lot of functional programming features onto their imperative programming basic syntax. In C#, for instance, Linq is a direct rip-off of Lisp’s S-Expressions and it now has Closures and lambda functions. Functional languages provide ways to think at a higher level than imperative languages. In a functional program you describe what you want and in an imperative program you describe how to do it. Here’s an example in C#, using imperative programming: var data = new int[] { 1, 2, 3, 4, 5 }; var sumOfSquares = 0; for(var i = 0; i x * x).Sum(); In the second case, I’m taking the list of numbers, using Select to translate that into a list of their squares (also known as a Map operation) and then using Sum on the resulting list to compute an aggregate sum (also known as a Reduce operation). It has some interesting advantages. For instance, the original code can’t be split across multiple cores, but the latter can. Also, if you know both syntaxes, the latter is easier to read and understand. Now take ladder logic. I’ve made the claim before that basic ladder logic (with contacts and coils) is actually a functional language. A simple example might be ANDing two inputs to get an output, which in C# would look like this: var output = inputA && inputB; That’s actually functional. If I wanted to write it imperatively I’d have to do something like: var output = false; if(inputA && inputB) { output = true; } In ladder logic, that would be the equivalent of using an unlatch (or reset) instruction to turn off an output and then using a latch (or set) instruction to turn on the output if the A and B contacts were true. Clearly that’s not considered “good” ladder logic. Similarly, a start/stop circuit goes like this: var run = (start || run) && !stop; Now historically, mathematicians and physicists preferred functional languages because they just wanted to describe what they wanted, not how to do it. It’s worth noting that electricians, looking at ladder logic, prefer to see functional logic (with contacts and coils) rather than imperative logic (with sets, resets, and move instructions). In recent years we’ve seen all major PLC brands start to include the full set of IEC-61131-3 languages, and the most popular alternative to ladder logic is structured text. Now that it’s available, there are a lot of newer automation programmers who only ever knew imperative programming and never took the time to learn ladder logic properly, and they just start writing all of their logic in structured text. That’s why we’re seeing automation programming slowly shift away from the functional language (ladder) towards the imperative language (structured text). Now I’m not suggesting that structured text is bad. I prefer to have more tools at my disposal, and there are definitely times when structured text is the correct choice for automation programming. However, I’d like to point out ...

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