DISTRIBUTED CONTROL SYSTEM
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Joined: Apr 2010
28-05-2010, 04:32 PM
this Project idea is to control 4 parameter using 1 master and 3 slave.Parameter controlled are DC MOTOR, ANGULAR CONTROL OF STEPPER MOTOR, PRESSURE AND WATER LEVEL USING MICROCONTROLLERS. EXPECTED RESULT The micro controller is responsible for the data to be sent across on to the RS 485 bus slaves works according to the data sent across by the master and then controls the motor speed . The master which is responsible for the predetermined level of the speed of the motor if the input exceeds the determined level ,it would then sends the signal to the microcontroller and the speed is adjusted accordingly. Thus the speed of the motor is controlled. Similarly with the help of two others slave we can control liquid level and angular control using stepper motor.
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Joined: Apr 2012
04-10-2012, 12:22 PM
Distributed Control Systems
DCS control workshop 2002.ppt (Size: 423 KB / Downloads: 75)
Collection of hardware and instrumentation necessary for implementing control systems
Provide the infrastructure (platform) for implementing advanced control algorithms
History of Control Hardware
Transmission: the signals transmitted pneumatically are slow responding and susceptible to interference.
Calculation: Mechanical computation devices must be relatively simple and tend to wear out quickly.
Electron analog implementation:
Transmission: analog signals are susceptible to noise, and signal quality degrades over long transmission line.
Calculation: the type of computations possible with electronic analog devices is still limited.
Advantages of Digital System
Digital computers are more flexible because they are programmable and no limitation to the complexity of the computations it can carry out.
Digital systems are more precise.
Digital system cost less to install and maintain
Digital data in electronic files can be printed out, displayed on color terminals, stored in highly compressed form.
Computer Control Networks
Programmable Logic Controllers:
specialized for non-continuous systems such as batch processes.
It can be used when interlocks are required; e.g., a flow control loop cannot be actuated unless a pump has been turned on.
During startup or shutdown of continuous processes.
Local Control Unit: This unit can handle 8 to 16 individual PID loops.
Data Acquisition Unit: Digital (discrete) and analog I/O can be handle.
Batch Sequencing Unit: This unit controls a timing counters, arbitrary function generators, and internal logic.
Local Display: This device provides analog display stations, and video display for readout.
Bulk Memory Unit: This unit is used to store and recall process data.
Advantages of DCS
Access a large amount of current information from the data highway.
Monitoring trends of past process conditions.
Readily install new on-line measurements together with local computers.
Alternate quickly among standard control strategies and readjust controller parameters in software.
A sight full engineer can use the flexibility of the framework to implement his latest controller design ideas on the host computer.
Digital DCS systems are more flexible. Control algorithms can be changed and control configuration can be modified without having rewiring the system.
Data resolution due to digitization
Accuracy depends on resolution.
Resolution depends on number of bits:
Resolution = signal range × 1/(2m -1)
m = number of bits used by the digitizer (A/D) to represent the analog data
Utilization of DCS
Implementation of advanced control:
Developed software for control algorithms, DMC, Aspen, etc.
Control-oriented programming language supplied by the DCS vendors.
Self-developed programs using high-level programming languages (Fortran, C++)