With reference the ladder logic programming language design PLC Based Automatic Intelligent Car Parking System with counters and timers.

4. A/An can be described as an imaginary device that exists only in the logic of the computer. a. internal relay b. limit switch C. I/O track d. phototransistor 00nmmended nractice when installing PLCS?

Exercise-2: Design a PLC program and prepare a typical I/O connection diagram and ladder logic program for the following motor control: W Three starters are to be wired so that each starter is operated from its own start/stop pushbutton station. . A master stop station is to be included that will trip out all starters when pushed. . Overload relay contacts are to be programmed so that an overload on any one of the starters will automatically drop all of the starters. . All pushbuttons are to be wired using one set of NO contacts.

Define in short about PLC.