Advantages Of Programmable Controller : 1. Very fast 2. Easy to change logic i.e. flexibility 3. Reliable due to absence of moving parts 4. Low power consumption 5. Easy maintenance due to modular assembly 6. Facilities in fault finding and diagnostic 7. Capable of handling of very complicated logic operations 8. Good documentation facilities 9. Easy to couple with the process computers 10. Analog signal handling and close loop control programming 11. Counter, timer and comparator can be programmed 12. Ease operator interface due to colourographic and advisory system introduction.
Application : 1. Home automation 2. Railway signaling 3. Chemical plant 4. Packaging industry 5. Automobile industry
The advantages of PLC are as follows: 1. Flexible in Nature: One model of PLC can be used for different operations as per requirement. 2. Easy to install and troubleshooting: In hard wired relay based systems, installation time is more as compared to the PLC based control panels. 3. Availability of Large contacts: PLC programming tools contain internal large number of contacts that can be used for any change induced in different applications. 4. Cost effective: Advanced technology and large production of PLC makes it cheaper than the other controller or relay based systems. 5. Simulation feature: PLC programming software comes with the simulation features by default.
Application of PLC 1.Continuous bottle filling system 2.Batch mixing system 3.stage air conditioning system 4.Traffic control