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.
Safety relays are a special type of relay you can use to build a safety circuit. Safety is a critical issue in machine design. It is crucial to have a good basic understanding of the principles behind safety relays and safety circuits.
With that said, safety often becomes a confusing matter because a lot of terminology is attached to it. All that terminology comes from the standards describing safety circuits, functional safety and thereby safety relays.
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.
This is an introduction to PLC logic. You can use PLC logic to build PLC programs with simple electrical circuit diagrams. In this article, I will use combinatorial logic to build the functionality of a PLC program.
And to get as close as possible to real a PLC programming language like ladder logic, the PLC logic in this article will be contacts and relays in an electrical circuit.