![]() ![]() For instance, at the inputs, sensors such as temperature, level, or pressure sensors monitor the machine functions. These are linked to the system or machine via sensors and actuators. The basic version features a processor in the central assembly, signal inputs and outputs, the interface, and an operating system.ĭepending on the model’s complexity, controllers may have a different number of analogue or digital inputs and outputs. This might also mean that different alternatives to common serial cables may be used when determining the requirements for PLC accessories.Ī PLC device essentially consists of a base station with some inputs and outputs. It will be specific to a manufacturer and sometimes a specific model, too. It should be noted that PLC programming software is not standardised. The main program will then continue once the additional loop has completedĮvent-controlled PLCs - these are designed to process specific pre-programmed tasks following a status change of the connected sensor/s The process will start all over again after the control signals have been transferred to the outputsĬyclic PLCs with interrupt - these are programmed to run an additional program loop adapted to a different situation if the status of the connected sensor changes. The inputs are queried, and control is passed onto the user program. Programmable logic controller software can be further categorised as follows:Ĭycle-oriented PLCs - these follow the basic principle of data processing with input, processing, and output. Number-based functions including time and counting The actual operation is then handled by the PLC, independently of the personal computer, and autonomously as the controllers have their own power supply. It is loaded onto the controller via the interface and defines the switching of output devices and input devices. The control is programmed via the application program either on the computer or via a connected control panel. It is also important to note that although you would normally use a laptop and software, some older models can be used with handheld programmers. On the flip side, SCL is primarily used for more complex and demanding programming requirements. For instance, a simple, user-friendly Ladder diagram can be a big help. Visual, image-based languages such as Ladder logic can also help when it comes to understanding and improving processes. Additionally, it helps to make I/O behaviour easy to understand. FBD is a popular choice for beginners as it utilises a drag-and-drop functionality. PLC programming courses and tutorials are widely available if you are new to the world of logic and programming languages. SCL: Structured Control Language (graphic-based) Common options include:įBD: Function Block Diagram (graphic-based) Different models are suitable for use with varying programming languages. ![]()
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