totalopf.blogg.se - Engineering control systems plc pdf

So we can say PLCs would work better in a small production environment or a single process such controlling an equipment like line\unit flow control by opening\closing valve.īut DCS systems is more advanced where is aided with more complicated components that's why it is suitable for environment where there are large I/O counts with many continuous processes such controlling a unit with many equipment and lines and distributed. Servers: used for the collection of data at the processor level( between operator unit and processors in field device.Īrchiving computers: used for storing operational data that may be used for process study \ development or compliance.Įngineering stations are used for creating the projects on which the processes run such as Logic for tasks - Graphical displays for operator interaction - Administration of all of those tasks through installed software packages.ģ- Controllers supervise the individual processors as well as I/O modules and is responsible for providing the data to the servers, which in turn, supply it for operator graphical interface.Ĥ - Field Devices: at this level would be devices such as transmitters, switches, valves, motors, remote or distributed I/O, etc

- Servers, Archiving and Engineering Computers.

- Operator Stations: Operator Stations, in a DCS, are the heart of the system.

It's ideal for more complex process continuous, complex controls and it have an integrated control center more than PLC Systems. While DCS stands for "Distributed Control System". It is often a computer or laptop and also used for running programming tool (software).

- Programming Device: acts as the brain of the system which receives signal and uses a Binary language (0 or 1) to process it and give Binary output.

- Processor or sometimes called (CPU) : The size and type of CPU will determine things like: the programming functions available, size of the application logic available, amount of memory available, and processing speed.

These act like an actuator the PLC that can change to adjust or control the process – motors, lights, relays, pumps, etc.

- Input/ Output assembly (I/O): inputscarry signals from the process into the controller, they can be input switches, pressure sensors, operator inputs while outputsare the devices that the PLC uses to send changes out to the world.- Power Supply: Common power levels used are 24V DC or 120 VAC.PLC is ideal for single batch or high-speed control, it have a relatively simple, low-cost design, and are the core of the system. It is a computer-type device used to control equipment in an industrial facility PLC stands for "Programmable Logic Controller" which is evolution for early control systems used with industrial automation and process control. For Process Engineer point of view : what is the difference between PLC, DCS & SCADA ? Lets get familiar with PLC