# Home > Automation > PLC (Programmable Logic Controller)

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**Topic under **PLC (Programmable Logic Controller)

**Source:** www.fer.unizg.hr

**File size:** **6 MB**

**File type:** **pdf**

**Last download on:**
Mon Nov 27, 2017 04:55:30 PM

__Short Desciption__:

Machine control design is a unique area of engineering that requires the knowledge
of certain specific and unique diagramming techniques called ladder diagramming.
Although there are similarities between control diagrams and electronic diagrams, many
of the component symbols and layout formats are different. This chapter provides a study
of the fundamentals of developing, drawing and understanding ladder diagrams. We will
begin with a description of some of the fundamental components used in ladder diagrams.
The basic symbols will then be used in a study of boolean logic as applied to relay
diagrams. More complicated circuits will then be discussed.

__Summary__:

Most textbooks related to programmable controllers start with the basics of
ladder logic, Boolean algebra, contacts, coils and all the other aspects of learning to
program PLCs. However, once they get more deeply into the subject, they generally
narrow the field of view to one particular manufacturer's unit (usually one of the more
popular brands and models), and concentrate on programming that device with it's
capabilities and peculiarities. This is worthwhile if the desire is to learn to program that
unit. However, after finishing the PLC course, the student will most likely be employed
in a position designing, programming, and maintaining systems using PLCs of another
brand or model, or even more likely, many machines with many different brands and
models of PLC. It seems to the authors that it would be more advantageous to
approach the study of PLCs using a general language that provides a thorough
knowledge of programming concepts that can be adapted to all controllers. This
language would be based on a collection of different manufacturer types with generally
the same programming technique and capability. Although it would be impossible to
teach one programming language and technique that would be applicable to each and
every programmable controller on the market, the student can be given a thorough
insight into programming methods with this general approach which will allow him or her
to easily adapt to any PLC encountered.

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