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Today i will go out meet one of my friends which is my senior to ask him about the PLC. I already forgot what i have learn in PLC. actually i already learn PLC in my Diploma but when i don't practice or play around with that thing i almost forgot about it. So today i will remain back what have i learn in the PLC syllabus in my Diploma. My senior are stay at Taman Ukay Perdana at Ampang Selangor. hopefully i can understand and remind back what have i learn in PLC because one of the task that Sir Saiful give is to create one of the program PLC in the real life. I decided to make system an car park which is same as Figure below.