The Building Block of Automation Applications PLC Systems


PLC (Programmable Control Devices) is called a microprocessor that processes the data sent to it and transmits it to the desired program. Digitally operating PLC systems provide the opportunity to use ready-made functions by easily adapting to existing applications. PLC systems providing data management, production process control, motion control adapt to new technologies. PLC systems provide continuous digital and analog control of operations performed by working digitally. In addition, it evaluates data processing, counting, sorting, arithmetic operations, logic functions by providing programming support. PLC systems, which have many uses in the industry, can be easily programmed with their own control units in parallel with new technologies in the electronics field. Thanks to the program support, it supports the current production stages with parts such as cpu and memory.

PLC Features

  • Program content should be able to be changed and it should be easy and fast to do this in the factory.
  • The program should be continuous and ease of use of the installed system should be ensured.
  • It must have high reliability within the factory.
  • Compared to relay control, its dimensions should be smaller for ease of installation.
  • The control unit must perform the data flow to the main system in a healthy way.
  • The cost of the relay system should be low.

PLC Types

1) Sequence Control: PLCs are the closest application of actively used types to relay systems with their "sequential operation" feature. This application is used in machine systems and these lines. 2) Motion Control: The motion control of the systems is provided by combining linear and rotary motion control systems with PLC. It provides the control of single or multi-axis systems that can be used in servo step and hydraulic drives. As an example to these; Relevant examples such as cartesian robots, fabric textile systems can be given. 3) Process Control: These PLC types control physical parameters by measuring (speed, pressure, flow rate, temperature). Systems require analog I / O (input / output) to create a control system. Control systems in PLC systems are made with PID software. Heating furnaces and injection machines can be given as examples of these systems. 4) Data Management: PLC systems collect, examine and process data about the processes it has audited. The processed data is compared with reference data in the memory of the controller. These compared data can be transferred to another device for report output. These applications are used for processing in the food, paper and metal industries. It is actively used in many sectors such as energy, chemistry, manufacturing and food. It facilitates engineering services by adapting to developing new technologies. It detects and evaluates physical events and changes that may occur in the fields by using various measuring devices.