Programming the PLC

 Programming the PLC

There are several languages ​​used to program the device from within the PLC and programming languages ​​commonly used:
• the planned program of peaceful Ladder diagram:
And is of the most widely used languages ​​in the organs plc because it looks like Palmrhlat and control codes can be used by technicians and engineers easily as it is a Mahmoah successive symbols that show the flow of electric current to perform the desired function.
For example, and restart the engine with two switches






• Program Statement list / STL
And is a collection of commands that are understood by the computer.
• Program Function blck diagram

Component unit of the PLC

Component unit of the PLC
Unit is composed of the PLC of the following main components:
1. Unit income Input module
2. CPU CPU
3. Unit Output Output module
4. Power source unit Power supply unit
5. Unit Operator Operator unit
6. Device programming Programming Device

Characteristics of the PLC unit

Characteristics of the PLC unit

1. Size is small.
2. Ease and speed of changes in the work of the control system
3. Control system and integrated detection errors
4. Control system and document the immediate and ongoing basis.
5. Low cost.

What is the PLC

What is the PLC:
PLC stands for PROGRAMMABLE LOGIC CONTROLLER This means controlling the logical programmer, a device was developed to replace the electric control the traditional uses Altaymrat and Rilhat and Alquintactorat and counters, etc., all in order to control the machinery and machine tools, for example packaging machines in the factories.
The device of the PLC in view of the entrances to the INPUT and depending on the condition of ON / OFF 0/1 and through the program in the PLC within the control Palmforeig OUTPUT see Fig.
The user will usually enter the program by a special program the PLC to your user, but ultimately do the same work required.
The devices of the PLC used a lot in life, wherever there is industry there is a PLC in the industry.
To clarify the picture is much more we all know it is light signals to control a signal light and one that is, on the assumption that the reference be red and then yellow, then green for control so we need three Taymrat to do it.
But what if we want to control a crossroads in four directions Can you imagine how much we need to control Altaymrat so, so as you can see the more control the more the need for a larger PLC.

What are the basic elements of a system of automatic control?

What are the basic elements of a system of automatic control?

 If we reviewed the drawing shown in Figure 2 in Fsnlahz that there are four key elements of the department of any automated system can be broken down as follows:
• Measurement of measurement
• actuator final Final Actuator
• The Process process
• Automated ruling The Automatic controller
Here we will describe a simplified for each item separately:
Measurement Measurement
Output is measured to determine the present value of the variable that is controlled, such as pressure or temperature or level ...... etc. and uses the measuring device converts the value to the physical value of the electrical record Standard Values ​​for the governor can deal with them examples of normative values ​​or standard 0to 20 mA or 4-20 mA or 0-10v .... etc
Indicates the change in the electrical signal measured on the physical change in the value that people want to control.
And measurement is essential to complete the control must therefore be calibrated measuring device and not by any defect or else will be making decisions or actions of the ruling will not be telling the truth and lead to disorder and instability of the system.
Actuator final Final Actuator
Each process must be the final player Final actuator, a mechanical part, which is controlled electrically to the work of the organization or toning to change the value measured Feed Back signal to reach stability. Examples include servo drives and motors move .... etc.

What do we mean automatic control?

When there is a system that works automatically, the first thing that comes to mind is that there is a way of feeding back or reverse, or what is known as PAL Feed Back a signal from the output system are connected to controller Controller for adjustment of status to achieve the desired goal of course other than what can be used from this reference in other services such as registration or Recording of measurement measuring or Monitoring or statement analysis Analyzing ..
Examples include references reflect the pressure Pressure, Flow Flow, Level Level, moisture or acid etc. ..... of physical quantities that can be converted to electrical quantities Kalfolt Amp and using what is known as PAL Signal Transducers and transmitters Transmitters.

This is the stone foundation and backbone that will build upon our conversation for automatic control.
The basic idea of ​​the closed control system Closed loop Control System built primarily

Types of switches

Types of switches

roker switch push button toggle switch limit switch