Tag: PLC explained
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12.2 Input/Output (I/O) capabilities of PLC’s
Every programmable logic controller must have some means of receiving and interpreting signals from real-world sensors such as switches, and encoders, and also be able to effect control over real-world control elements such as solenoids, valves, and motors. This is generally known as input/output, or I/O, capability. Monolithic (“brick”) PLCs have a fixed amount of I/O capability…
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Chapter 12 Programmable Logic Controllers
Every control system may be divided into three general sections: input devices (sensors), controllers, and output devices (actuators). The input devices sense what is happening in the process, the controller decides what to do about it, and the output devices manipulate the process to achieve the desired result. A programmable logic controller or PLC is a general-purpose controller, applicable to many different types of…