5. a) Explain why a stop button must be normally closed and a start button must be normally open. b) Consider a case where an input to a PLC is a normally closed stop button. The contact used in the ladder logic is normally open, as shown below. Why are they both not the same? (i.e., NC or NO) start stop motor motor

The solid state devices designed to perform logical decision making to control the equipment is a. Switches O b. Programmable Logic Controller O. Relays The symbol used for output device in PLC is а. Ob. HE O d.

Define in short about PLC.

21.a. What type of circuits are present on an axis logic card for a stepper motor system and are used toaccelerate and decelerate a motor?A. Timing circuitsB. Main oscillator circuitsC. Ramp circuitsD. Bias circuits21.b. A scaling or header plug is used on some brushless motor drive systems toA. connect the tachometer to the drive.B. divide the output pulse train.C. connect the front panel indicator lights to the drive.D. set the current limit of the drive.

Q4 (a) Draw symbols that are used in ladder diagram for relay, motor, switch and light. (b) Design a basic structure of a programmab le logic controller (PLC) system.

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PROGRAMMABLE LOGICAL CONTROL List 5 main components of PLC and its function.

Familiarized and understand the PLC Basic Operation and draw an illustration that explains its process

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