Ladder diagram programming allows PLCs to perform several different types of tasks, including Boolean logic, timing, counting, arithmetic, and special functions. We'll discuss the basic instructions ...

One salient features of this design is that all of this information (ladder program, variables and comments) is stored within the PLC, so it’s rather self-documenting — that is to say, anyone making ...

Each of these objects can interact with the ladder program of the connected PLC either by use of “tags” (discussed in earlier articles in this series) which are variables with user-friendly names such ...