13-08-2012, 04:41 PM
[color=#FF0000][size=medium] REPORT ON PLC
1 REPORT ON PLC.pptx (Size: 376.54 KB / Downloads: 30)
What is PLC?
A PROGRAMMABLE LOGIC CONTROLLER is a solid state control system that monitors the status of devices connected as inputs. Based upon a user written program, stored in its memory and controls the status of devices connected as outputs.
Applications of PLC:
Starting and speed control of electric motor.
Electric drive sequencing as, starting,stopping,reversing e.t.c
Building automation.
Smart grid
Industrial automation as Bottling, packaging e.t.c
Working steps of PLC:
Step 1:
Write program as per the requirement.
Step 2:
Feed the program in PLC.
Step 3:
Connect the input/output modules of PLC to the field devices.
Step 4:
Run the PLC and get desired result.
Advantages:
Cost effective for controlling complex systems.
Flexible and can be re-applied to control other systems quickly and easily.
Computational abilities allow more sophisticated control.
Trouble shooting aids make programming easier and reduce downtime.
Reliable components make these likely to operate for years before failure.
Difference between Microcontroller and PLC:
A microcontroller design would be appropriate where end user need not alter the controls or using minimal controls.
PLC’s allow end user to configure and control the application which is more useful in industries.
Very complex controls and process like chemical industries requires more re-configurable controls.
PLC’s with I/O(Input / Output) devices require little electrical design and programming using simple ladder diagrams which are easy to understand, very simple and customized.
In case of mass production PLC’s are economical to build and maintenance.
Troubleshooting is also easier compared to microcontroller.