The most common processor used in a PLC is a single microprocessor. This includes program scanning (such as ladder logic), program executing, handling data storage, directing data flow and controlling communication among the various interfaces. In a PLC the CPU is responsible for control of all PLC activity. However, the PLC CPU is not set up to multitask like a computer CPU, but rather to perform dedicated tasks such as program scan and execution. The PLC CPU is a microprocessor that is similar to a computer CPU. The PLC processor contains 3 fundamental components: They are a fixed style PLC with embedded processor, but have the ability to expand with input and output modules. Some examples of PLCs with embedded processors are the Siemens Simatic S7-200 CPU 224, S7-200 CPU 226 and more recently the Siemens Simatic S7-1200, CPU 1214C (6ES7 214). While modular and distributed PLC types have their PLC processors as a separate module. Generally fixed PLC types have their processor embedded in the PLC itself. The PLC processor can be embedded into the PLC unit or come as a separate PLC module. Whatever you choose to call this piece of PLC hardware, the PLC processor is the workhorse of the PLC system responsible for all the logic computation and number crunching. Sometimes the PLC processor is also referred as the PLC controller or PLC CPU (Central Processing Unit). It is arguably the most crucial PLC hardware component. PLC Processor (CPU)Īt the heart of every PLC system is a processor. Let’s take a closer look at the major plc components and their functions… 1. They are the essential hardware elements that make up every PLC system. These main PLC hardware components are found in all PLC systems regardless of manufacturer, type and size. The 6 basic hardware components that make up a PLC are: That means PLC hardware components vary for different manufacturers and in the majority of cases are not interchangeable with hardware components from other PLC brands.
Dockmate ladder hardware software#
The majority of PLC manufacturers have developed hardware and software components to establish a proprietary PLC system. In that sense, PLC Hardware is a similar concept. And most of the components that are used, say in a Ford, cannot be used in a Honda.
Without all of its components a car cannot function properly.
The engine, gearbox, wheels, electrics, steering, body etc. Think of the main components that make up a car. Without all of its hardware components a PLC system cannot operate effectively. Each piece of PLC hardware is designed to perform a specific task. PLC hardware is a term that describes the physical components that make up the overall PLC system. Whereas the PLC software refers to the PLC’s operating system and application program that are stored in the PLC’s memory. The PLC hardware refers to the physical components that make up a PLC system. A PLC (Programmable Logic Controller) is made up of both hardware and software components.
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