UAT ISC / A&R 19 UAT ISC A&R 19 | Page 4

Where is it used? 1.- PLC Introduction What is it? The most complete definition of a PLC is that given by the NEMA (National Association of Electrical Manufacturers) that says that a PLC is: “Electronic instrument, which uses programmable memory to store instructions on the implementation of functions, such as logical operations, sequences of actions, temporal specifications, counters and calculations for control by means of analog or digital I / O modules on different types of machines and processes ". It uses a programmable memory to store instructions and specific functions that include On/Off control, timing, counting, sequencing, arithmetic, and data handling. The PLC is designed for multiple input and output signals, wide temperature ranges, immunity to electrical noise and resistance to vibration and impact. Programs for machine operation control are often used in backup batteries or non-volatile memories. Why and what to use it for? Mainly PLCs meet the requirements of process control and machinery sequences within the industrial sector, and if we check thoroughly we will find PLCs in elevators, escalators, ovens, dosing machines, pumping systems for aqueducts and pipelines, but also in shopping centers even in washing machines and microwaves, food and beverage vending machines, etc.