Welcome to the second part of my ladder logic tutorial. In part 1 of the ladder logic tutorial I introduced you to the very basics of ladder logic and to some basic instructions.
In this second part of the tutorial I will teach you how to solve actual problems with ladder logic and how to use it to build PLC programs. At the same time you will be introduced to several other ladder logic instructions:Set / Reset CoilsSet or Reset PrioritySet / Reset Function BlocksSR Function BlockRS Function BlockBuilding Logic with Ladder LogicLogic Gates with PLC InstructionsOR and AND GatesNOT Logic GateInterlocking with Ladder LogicLadder Logic Exercise 1: InterlockingOne [...]
When it comes to automation and manufacturing ISA-88 or just S88 is inevitable.
It is a standard for published by The International Society of Automation (ISA) that sets out models and terminology addressing batch control. The standard was published in an attempt to standardize and thereby making it easier for automation suppliers to integrate, communicate and configure batches. It is adopted by Europe as IEC 61512-1.
Today, the standard is used by most manufacturers and automation suppliers that deal with batch control. Especially productions of food and medicine utilizes if not the whole, then at least parts of the standard to keep track of their batch production.
Do you struggle with risk assessment? Safety in machinery is a very important, but often under taught area full of complicated terms from the ISO 12100 standard. This article will take you through a risk assessment example by using procedures and methods from ISO 12100 and the old ISO 14121-2.
Risk assessment is a way of finding risks and hazards in your machine design. All machine designers have to make sure their machines are safe for humans to operate. Eventually, it is our responsibility to find all the risks and then eliminate those risks.
One of the official and widely used PLC programming languages is Function Block Diagram (FBD). It is a simple and graphical way to program any functions together in a PLC program. Function Block Diagram is easy to learn and provides a lot of possibilities.
One of the best visual programming languages is a PLC programming language. It’s called ladder logic or ladder diagram (LD) and you can learn it very fast.
The smart thing about ladder logic is that it looks very similar to electrical relay circuits. So if you already know a little bit about relay control and electrical circuits, you can learn ladder logic even faster.
Do you also struggle reading your own and others huge ladder diagrams?
The truth is, that even though ladder diagram (LD) is an easy programming language for beginners, it can be very hard to read and understand. That’s why Structured Text is a better PLC programming language, and you can learn it in this tutorial.