4.a. What is the name of the nonprogrammable timer that is used to check the internal operation of the PLC? A. Housekeeping B. Scan C. Watchdog D. System 4.b. Which one of the following terms is used to define the identifying letters placed above an input contact in ladder logic? A. Surname B. Title C. Statement D. Locator

Determine the LED “on” current for the circuit above. Assume the logic “on” voltage is 5 volts, V(LED) = 2.0 volts and VCE(sat) = 0.4V.

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.

Discuss the Basic Operation of the PLC (Programmable Logic Controller)

Draw the leader diagram of the PLC program that performs the steps given below.Q0.0, Q0.1, Q0.2 and Q0.3 outputs will be active when I0.0 button is pressed. 15 seconds after these outputs are active, Q0.0, Q0.1 and Q0.2 outputs will stop. Q0.4 output will stop 10 seconds after Q0.0, Q0.1 and Q0.2 outputs stop. Write this program using SET/RESET commands.

3 Determine the current flowing I, given that the D1 is a Silicon type diode (Non-anonymous question) * 2 ΚΩ www R E₁ = 24 V D₁ D₂ E₂=4 V

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.