09-06-2012, 12:13 PM
Reasons for Use of PLC in our project
[attachment=689]
From the programming point of view, PLC manufacturers has developed standards such as statement list, structured text, ladder, function block diagram, sequencial function chart. With this standards user can concentrate on how to make their factory work and let the PLC manufacturer doing the circuitry and programming of the microcontroller inside the PLC and do the
testing for the whole unit.
1. Housing, electrical properties of inputs/outputs and power supplies are designed for industrial environments.
2. Module standardization makes it possible to repair on module instead of component/chip level.
3. System and software standardization makes it possible to find personnel yet experienced with your PLC system.
4. It should be easier for electricians to use the ladder logic representation of PLC programs.
Applications & Advantages of PLC and MICROCONTROLLER:
A microcontroller design would be appropriate where end user need not alter the controls, rather only selecting controls(like timer).
Example: .A washing machine where user only selects different controls and need not alter the controls. Similarly in home automation also where there is no need of altering the controls.
PLC applications
are highly customized systems so the cost of a packaged PLC is low compared to the cost of a specific custom-built controller design.
PLCs contain input and output devices compatible with industrial devices and controls; little electrical design is required, and the design problem centers on expressing the desired sequence of operations.
Very complex process control may high-performance PLCs.
[attachment=689]
From the programming point of view, PLC manufacturers has developed standards such as statement list, structured text, ladder, function block diagram, sequencial function chart. With this standards user can concentrate on how to make their factory work and let the PLC manufacturer doing the circuitry and programming of the microcontroller inside the PLC and do the
testing for the whole unit.
1. Housing, electrical properties of inputs/outputs and power supplies are designed for industrial environments.
2. Module standardization makes it possible to repair on module instead of component/chip level.
3. System and software standardization makes it possible to find personnel yet experienced with your PLC system.
4. It should be easier for electricians to use the ladder logic representation of PLC programs.
Applications & Advantages of PLC and MICROCONTROLLER:
A microcontroller design would be appropriate where end user need not alter the controls, rather only selecting controls(like timer).
Example: .A washing machine where user only selects different controls and need not alter the controls. Similarly in home automation also where there is no need of altering the controls.
PLC applications
are highly customized systems so the cost of a packaged PLC is low compared to the cost of a specific custom-built controller design.
PLCs contain input and output devices compatible with industrial devices and controls; little electrical design is required, and the design problem centers on expressing the desired sequence of operations.
Very complex process control may high-performance PLCs.