Base unit

In industrial technology, automated processes are no longer possible without programmable logic controllers. If you would also like to set up automated processes, the following article will give you a brief overview of this modern technology. At eibabo® you get a variety of:

  • Basic devices for PLC controls, for Alpha XL and Siemens Logo!
  • Basic devices and CPU compact devices
  • CPU central assemblies and fieldbus controllers
  • Inline controllers and control units

 

Today, these devices are used in all industries, both in large and small automation systems.

What are Programmable Logic Controllers (PLC)?

A controller in automated systems carries out the control of physical processes in accordance with an underlying algorithm. For this purpose, it uses information received from sensors and output to end devices. Every automatic device has a control controller - a module that determines the logic of the device.

What are programmable logic controllers (PLCs)?

Programmable logic controllers (PLCs) are real-time devices for automating technological processes. The PLC is programmed digitally and can therefore be easily adapted to the requirements of a specific process. With the increasing demands on modern machines and production processes, PLC automation solutions have become indispensable in everyday industrial production. The main areas of application of the PLC are in their long-term use without the need for human intervention. PLCs are generally used to control sequential processes. The status of an object is determined by means of input signals and output parameters and corresponding control actions are carried out.

The History of Programmable Logic Controllers (PLC)

Before programmable logic controllers emerged in modern form, their development began with comparatively simple ladder logic in the middle of the last century. With the advent of microprocessor technology towards the end of the 1960s, industrial automation processes were also directly influenced. Digital circuits developed, which have since been used in automatic control systems.

In 1968, a group of engineers at General Motors were tasked with making easily programmable industrial controllers. These should be easy to maintain and repair. A modular design should also make it possible to replace the installed modules or add new modules. The world's first programmable logic controller was called 'Modicon 084' and was presented in 1969. The device weighed about a hundredweight and consisted of a cabinet with a number of modules whose storage capacity was just 4 kilobytes.

 


Already knew

The invention of the first PLC is credited to American engineers Richard E. Morley and Odo J. Struger.


 

In 1970, the world's first automated control system based on this controller was presented at the Chicago Machine Tool Show.

Where are basic PLC devices used?

Programmable logic controllers offer a simple and cost-effective solution for many automation tasks and are the ideal solution for the individual control of a wide variety of applications, machines, systems and processes or for digital power control. With any automation-based control system, the focus is on achieving the desired result efficiently and reliably. As part of process automation, they control robotic arms in the automotive industry, complex conveyor technology or processes in nuclear energy, transport and traffic.

How is a basic PLC device constructed?

A basic device for the programmable logic controller typically consists of the following components:

  • Inputs for signal acquisition – the device monitors the current status of the system via connected buttons, thermometers, tachometers or sensors
  • Outputs for signaling – the devices of a system are connected here, with which the PLC executes a process
  • Software – the user program that is used to determine the switching of outputs depending on the activation of the inputs
  • Communication interface - this is used to connect the PLC to other systems

 

The base unit also requires its own power supply and contains a processor and the internal bus.

Source: eibabo®, Mitsubishi AL2-24MR-A #215074 basic deviceMitsubishi AL2-24MR-A #215074 basic unit

How does a basic PLC device work?

A programmable logic controller is a device that collects, converts, processes and stores information and generates control commands. Data is exchanged via inputs and outputs on the device. In this way, sensors, buttons, actuators and other devices can be connected to the control object. It is therefore a small computer, controlled by a microprocessor with its own operating system. This is adapted to the needs of solving automation problems in real time and works with the shortest possible response time. The PLC receives the signals from the controlled process via the inputs in the form of:

  • On/off states - for example position detection by limit switches or proximity switches
  • continuous analog signals - these include temperatures, pressure, speeds, levels and so on

 

The devices that run the automated process are connected to the output side. These in turn receive the signals from the basic device in the form of:

  • On/off control signals - for example for an electromagnetic relay, a motor contactor, a signal lamp and so on
  • continuous analog control signals - for example to open or close valves or to adjust engine speeds

 

The processor is located between the inputs and outputs. This is also called the Central Processing Unit (CPU) and controls the output signals based on the data of the input signals. Individual programming (using software for parameterization) can be used to determine how the PLC reacts to the input signals or their changes. This information is stored in the basic device. There is usually a separate interface on the device for this purpose. Another option is to connect the base unit to a network. Then communication within the framework of the network hierarchy with other peripheral devices and systems is possible.

What advantages does a PLC have over a classic relay circuit?

Over time, PLCs have adapted to the specific needs of the industrial environment. PLC functions have a number of advantages. Due to their flexibility, they can be used in a wide variety of industries. In addition to the possibility of remotely controlling a PLC, the greatest advantages lie in the ability to communicate and the individual programmability of the functional logic. The settings can be changed at any time without affecting the operation of the device itself. A PLC can usually be installed directly on a production machine.

How do I choose the right basic PLC device?

A large number of factors must be considered and evaluated when making the selection. By combining the technological requirements for a specific automation object with a comparison of modern programmable logic controllers, you can make the right decision. The selection of the right PLC depends, among other things, on the following criteria:

system requirements

The system requirements describe the task that the PLC should fulfil. Define the goals to be achieved and break them down into several simple and understandable steps. Determine the type of input devices and output devices to be connected to the PLC and their respective functions. Would you like to implement further special functions? How many inputs and outputs are required on the basic device? How much storage is required? What are your processor speed requirements?

service

Most PLCs are initially programmed with a computer. This is then no longer required to operate the PLC itself. Therefore, consider whether you want a PLC with an integrated display and touch panel. It can be enough to read the values and manage the system via the existing IT infrastructure.


communication

Is the data exchanged with other devices outside of the actual process? Is the device part of a network?

conditions of use

Is the PLC exposed to special operating conditions that affect the properties and function or have an impact on reliability and maintenance intervals?

electrical needs

What are your power requirements for the individual inputs and outputs and for the PLC itself?

operating speed

The speed of operation is responsible for the security and flow of 'time-critical' operations.

Manufacturers of high-quality basic devices for the PLC include: Mitsubishi Electric, Pilz, Siemens, WAGO Kontakttechnik or Phoenix Contact.

 

eibabo - technology store

 

Catalogue content:


In this eibabo® catalogue PLC's > PLC CPU-module you will find items from the following product groups:

Item overview:

  • Bus controller
  • Bus coupler
  • Bus participants
  • Communication
  • Control accessories
  • Control relay
  • Controller board
  • Controllers
  • DecentralizedEA
  • DecentralizedIO
  • Expansion module
  • Fieldbus component
  • Fieldbus controller
  • Fieldbus coupler
  • Fieldbus module
  • Fieldbus technology
  • Group carrier
  • Head station
  • Interbus tap
  • Interface
  • Logic module
  • Main group carrier
  • Modular control
  • Rectangular connector
  • Rectangular plug
  • Room automation
  • Room controller
  • Ship approval


from the following manufacturers:

Manufacturer overview catalogue Base unit:

  • ABB
  • Eaton
  • Mitsubishi
  • Omron
  • Phoenix
  • Pilz
  • Schneider Electric
  • Siemens
  • Stahl
  • Theben
  • WAGO
  • Weidmüller


 
In industrial technology, automated processes are no longer possible without programmable logic controllers. If you would also like to set up automated processes, the following article will give... read more »
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Basic device - For efficient process automation

In industrial technology, automated processes are no longer possible without programmable logic controllers. If you would also like to set up automated processes, the following article will give you a brief overview of this modern technology. At eibabo® you get a variety of:

  • Basic devices for PLC controls, for Alpha XL and Siemens Logo!
  • Basic devices and CPU compact devices
  • CPU central assemblies and fieldbus controllers
  • Inline controllers and control units

 

Today, these devices are used in all industries, both in large and small automation systems.

What are Programmable Logic Controllers (PLC)?

A controller in automated systems carries out the control of physical processes in accordance with an underlying algorithm. For this purpose, it uses information received from sensors and output to end devices. Every automatic device has a control controller - a module that determines the logic of the device.

What are programmable logic controllers (PLCs)?

Programmable logic controllers (PLCs) are real-time devices for automating technological processes. The PLC is programmed digitally and can therefore be easily adapted to the requirements of a specific process. With the increasing demands on modern machines and production processes, PLC automation solutions have become indispensable in everyday industrial production. The main areas of application of the PLC are in their long-term use without the need for human intervention. PLCs are generally used to control sequential processes. The status of an object is determined by means of input signals and output parameters and corresponding control actions are carried out.

The History of Programmable Logic Controllers (PLC)

Before programmable logic controllers emerged in modern form, their development began with comparatively simple ladder logic in the middle of the last century. With the advent of microprocessor technology towards the end of the 1960s, industrial automation processes were also directly influenced. Digital circuits developed, which have since been used in automatic control systems.

In 1968, a group of engineers at General Motors were tasked with making easily programmable industrial controllers. These should be easy to maintain and repair. A modular design should also make it possible to replace the installed modules or add new modules. The world's first programmable logic controller was called 'Modicon 084' and was presented in 1969. The device weighed about a hundredweight and consisted of a cabinet with a number of modules whose storage capacity was just 4 kilobytes.

 


Already knew

The invention of the first PLC is credited to American engineers Richard E. Morley and Odo J. Struger.


 

In 1970, the world's first automated control system based on this controller was presented at the Chicago Machine Tool Show.

Where are basic PLC devices used?

Programmable logic controllers offer a simple and cost-effective solution for many automation tasks and are the ideal solution for the individual control of a wide variety of applications, machines, systems and processes or for digital power control. With any automation-based control system, the focus is on achieving the desired result efficiently and reliably. As part of process automation, they control robotic arms in the automotive industry, complex conveyor technology or processes in nuclear energy, transport and traffic.

How is a basic PLC device constructed?

A basic device for the programmable logic controller typically consists of the following components:

  • Inputs for signal acquisition – the device monitors the current status of the system via connected buttons, thermometers, tachometers or sensors
  • Outputs for signaling – the devices of a system are connected here, with which the PLC executes a process
  • Software – the user program that is used to determine the switching of outputs depending on the activation of the inputs
  • Communication interface - this is used to connect the PLC to other systems

 

The base unit also requires its own power supply and contains a processor and the internal bus.

Source: eibabo®, Mitsubishi AL2-24MR-A #215074 basic deviceMitsubishi AL2-24MR-A #215074 basic unit

How does a basic PLC device work?

A programmable logic controller is a device that collects, converts, processes and stores information and generates control commands. Data is exchanged via inputs and outputs on the device. In this way, sensors, buttons, actuators and other devices can be connected to the control object. It is therefore a small computer, controlled by a microprocessor with its own operating system. This is adapted to the needs of solving automation problems in real time and works with the shortest possible response time. The PLC receives the signals from the controlled process via the inputs in the form of:

  • On/off states - for example position detection by limit switches or proximity switches
  • continuous analog signals - these include temperatures, pressure, speeds, levels and so on

 

The devices that run the automated process are connected to the output side. These in turn receive the signals from the basic device in the form of:

  • On/off control signals - for example for an electromagnetic relay, a motor contactor, a signal lamp and so on
  • continuous analog control signals - for example to open or close valves or to adjust engine speeds

 

The processor is located between the inputs and outputs. This is also called the Central Processing Unit (CPU) and controls the output signals based on the data of the input signals. Individual programming (using software for parameterization) can be used to determine how the PLC reacts to the input signals or their changes. This information is stored in the basic device. There is usually a separate interface on the device for this purpose. Another option is to connect the base unit to a network. Then communication within the framework of the network hierarchy with other peripheral devices and systems is possible.

What advantages does a PLC have over a classic relay circuit?

Over time, PLCs have adapted to the specific needs of the industrial environment. PLC functions have a number of advantages. Due to their flexibility, they can be used in a wide variety of industries. In addition to the possibility of remotely controlling a PLC, the greatest advantages lie in the ability to communicate and the individual programmability of the functional logic. The settings can be changed at any time without affecting the operation of the device itself. A PLC can usually be installed directly on a production machine.

How do I choose the right basic PLC device?

A large number of factors must be considered and evaluated when making the selection. By combining the technological requirements for a specific automation object with a comparison of modern programmable logic controllers, you can make the right decision. The selection of the right PLC depends, among other things, on the following criteria:

system requirements

The system requirements describe the task that the PLC should fulfil. Define the goals to be achieved and break them down into several simple and understandable steps. Determine the type of input devices and output devices to be connected to the PLC and their respective functions. Would you like to implement further special functions? How many inputs and outputs are required on the basic device? How much storage is required? What are your processor speed requirements?

service

Most PLCs are initially programmed with a computer. This is then no longer required to operate the PLC itself. Therefore, consider whether you want a PLC with an integrated display and touch panel. It can be enough to read the values and manage the system via the existing IT infrastructure.


communication

Is the data exchanged with other devices outside of the actual process? Is the device part of a network?

conditions of use

Is the PLC exposed to special operating conditions that affect the properties and function or have an impact on reliability and maintenance intervals?

electrical needs

What are your power requirements for the individual inputs and outputs and for the PLC itself?

operating speed

The speed of operation is responsible for the security and flow of 'time-critical' operations.

Manufacturers of high-quality basic devices for the PLC include: Mitsubishi Electric, Pilz, Siemens, WAGO Kontakttechnik or Phoenix Contact.

 

eibabo - technology store

 

Catalogue content:


In this eibabo® catalogue PLC's > PLC CPU-module you will find items from the following product groups:

Item overview:

  • Bus controller
  • Bus coupler
  • Bus participants
  • Communication
  • Control accessories
  • Control relay
  • Controller board
  • Controllers
  • DecentralizedEA
  • DecentralizedIO
  • Expansion module
  • Fieldbus component
  • Fieldbus controller
  • Fieldbus coupler
  • Fieldbus module
  • Fieldbus technology
  • Group carrier
  • Head station
  • Interbus tap
  • Interface
  • Logic module
  • Main group carrier
  • Modular control
  • Rectangular connector
  • Rectangular plug
  • Room automation
  • Room controller
  • Ship approval


from the following manufacturers:

Manufacturer overview catalogue Base unit:

  • ABB
  • Eaton
  • Mitsubishi
  • Omron
  • Phoenix
  • Pilz
  • Schneider Electric
  • Siemens
  • Stahl
  • Theben
  • WAGO
  • Weidmüller
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