![]() That assumes that the system would not require additional devices in the next years to come. With the Fixed I/O PLC, however, you gain economic advantage if your control system would only consist of a handful of devices such that only one device would be sufficient to handle it. With the Fixed I/O PLC, you would be limited only to the capacity of that single device that performs the control and input scans in your control system. This would not be possible with the Fixed I/O PLC. The modular PLC, because you can always add modules over and over again, provides greater scalability not only for your PLC control system but also to the company that uses the controller.īy using the Modular PLC, the processes become more centralized as the modules are only added to 1 programmable logic controller.īecause of the Modular PLC’s design, the company would be able to expand their assembly lines, for example, by adding more similar output devices that perform similar tasks to be controlled by the same controller. Here are some of the advantages that the Modular PLC has over the Fixed PLC: Scalability The modular PLC is the most desirable type of PLC especially for large industrial systems with a lot of devices to take input from or control. ![]() What are the advantages of using Modular PLC? In a rack mount PLC, the communications module of the PLC resides in the rack itself, so all connections are centralized. The power supply, communications module, Input/Output module are all separate to the actual microcontroller so you have to manually connect them to each other to create your PLC control system.Ī type of modular PLC is the rack-mounted or rack mount PLC. Modules give the programmable logic controller additional features like increased number of I/O units, and they are usually easier to use because each component is independent of each other. The modular PLC is a type that allows multiple expansions of the PLC system through the use of modules, hence the term “modular”. Modular PLC Types of PLC: Modular PLC (Photo from ) This means that every type of output or input is fixed and is determined by the manufacturer.įurthermore, the number of inputs and outputs may not be expanded in this type of PLC. When you buy Compact PLCs, you will notice that the input section and the output sections of the PLC are integrated into the microcontroller itself. “Fixed I/O” actually stands for Fixed “Input/Output”. This type of PLC is most commonly called the Fixed I/O PLC. Fixed/Integrated/Compact PLC Types of PLC: Fixed I/O (Photo from ) ![]() When it comes to the types of PLC, these two are the most common answer that you will find in any source from the internet simply because they are the least subtle of all the classifications available.ġ. 1.3 An analogy for the Fixed I/O and Modular I/O. ![]() 1.2.1 What are the advantages of using Modular PLC?. ![]()
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