What is a programmable logic controller (PLC)?
A programmable logic controller ( PLC) or programmable controller is an industrial computer that has been ruggedized and adapted for the control of manufacturing processes, such as assembly lines, machines, robotic devices, or any activity that requires high reliability, ease of programming, and process fault diagnosis.
What are the applications of programmable controllers?
Programmable controllers are widely used in motion, positioning, or torque control. Some manufacturers produce motion control units to be integrated with PLC so that G-code (involving a CNC machine) can be used to instruct machine movements. Nano ACE PLC & Chip PLC for small machine builders / Small or medium volumes.
What is the function of the input module of PLC?
The input module of PLC does four main functions. There are two main sections in the input module namely the power section and the logical section. Both sections are electrically isolated from each other. Initially push button is closed. So, 220 V AC supply is given to the bridge circuit through the resistors R1 and R2.
What are the I/O modules in plc?
Small-sized PLC is equipped with a fixed I/O pin configuration. So, they have gone for modular type rack PLC, which accepts different types of I/O modules with sliding and fit in concept. All I/O modules will be residing inside this rack/chassis. This module is used to provide the required power to the whole PLC system.
What type of memory is used in PLCs?
The oldest PLCs used non-volatile magnetic core memory . A PLC is an industrial microprocessor-based controller with programmable memory used to store program instructions and various functions. It consists of: a communications interface to receive and transmit data on communication networks from/to remote PLCs.
What is the difference between traditional and open PLCs?
Traditional PLCs are generally closed platforms, but some newer PLCs (e.g. ctrlX from Bosch Rexroth, PFC200 from Wago, PLCnext from Phoenix Contact, and Revolution Pi from Kunbus) provide the features of traditional PLCs on an open platform . PLCs may include logic for single-variable feedback analog control loop, a PID controller.