Internal architecture. Programmable logic controllers. Input devices. Output devices. Examples of applications. Input-output devices. Untouchable Book Pdf. The binary system. Octal and hexadecimal. Binary arithmetic.
Contents • • • • • • • • • • Introduction [ ] What is a Programmable Logic Controller (PLC)? [ ] A Programmable Logic Controller, or PLC, is more or less a small computer with a built-in operating system (OS). This OS is highly specialized and optimized to handle incoming events in real time, i.e., at the time of their occurrence. The PLC has input lines, to which sensors are connected to notify of events (such as temperature above/below a certain level, liquid level reached, etc.), and output lines, to which actuators are connected to effect or signal reactions to the incoming events (such as start an engine, open/close a valve, and so on).