What is a programmable logic controller?
What is a programmable logic controller?
A programmable logic controller (PLC) is a special form of microprocessor-based controller that uses a programmable memory to store instructions and to implement functions such as logic, sequencing, timing, counting, and arithmetic to control machines and processes and is designed to be operated by engineers with perhaps a limited knowledge of
What is the function of the PLC controller?
an input and output interface, where the controller receives and sends data from/to external devices, a communications interface to receive and transmit data on communication networks from/to remote PLCs. PLCs require programming device which is used to develop and later download the created program into the memory of the controller.
Can interlock safety interlock be implemented in programmable logic controllers?
Programmable logic controllers are a potential candidate for implementing interlocks due to excellent capability of implementing discrete logic. However, implementation of safety interlocks in programmable electronic systems is not universally accepted and many organizations require that all safety interlocks be hard-wired.
What programming language is used in PLCs?
Modern PLCs can be programmed in a variety of ways, from the relay-derived ladder logic to programming languages such as specially adapted dialects of BASIC and C. Another method is state logic, a very high-level programming language designed to program PLCs based on state transition diagrams.
What is the control logic for manufacturing?
Before, control logic for manufacturing was mainly composed of relays, cam timers, drum sequencers, and dedicated closed-loop controllers. The hard-wired nature made it difficult for design engineers to alter the automation process. Changes would require rewiring and careful updating of the documentation.
Programmable Logic Controller • A programmable logic controller (PLC) is a specialized computer used to control machines and process. • It uses a programmable memory to store instructions and specific functions that include On/Off control, timing, counting, sequencing, arithmetic, and data handling
Can a program be downloaded from one plc to another?
Once a program has been written and tested it can be downloaded to other PLCs. Since all the logic is contained in the PLC’s memory, there is no chance of making a logic wiring error. Conversely……
What are the capabilities of PLC?
Communications Capability: A PLC can communicate with other controllers or computer equipment. They can be networked to perform such functions as: supervisory control, data gathering, monitoring devices and process parameters, and downloading and uploading of programs. Lecture – Introduction to PLC’s MME 486 – Fall 2006 11 of 47
What do you need to program a PLC?
Programming a PLC :Programming a PLC : y In order to create or change a program, the following items are needed: y PLC y Programming Device y Programming Software y Connector Cable 11 12. You can use a personal computer as a programming device 12
