Understanding Motor Controls
4th Edition
ISBN: 9781337798686
Author: Stephen L. Herman
Publisher: Delmar Cengage Learning
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Chapter 38, Problem 3RQ
Name the four basic sections of a programmable logic controller.
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Traffic Light System
Construct a PLC program for a traffic light system with the following condition:
The green light will be ON for 10 second, followed by the yellow light for 3 second and red
light for 20. The system will run continuously until the START/STOP switch is deactivated.
Figure 12: The traffic light system
Two Directional Control of Traffic Light
Extend the PLC program for the traffic light system with the following condition:.
Red = north/south
Green = north/south
Amber = north/south
Green = east/west
Amber = east/west
Red = east/west
-25 s
·5 s
25 s
5 s
Chapter 38 Solutions
Understanding Motor Controls
Ch. 38 - What industry first started using programmable...Ch. 38 - Name two differences between PLCs and common home...Ch. 38 - Name the four basic sections of a programmable...Ch. 38 - Prob. 4RQCh. 38 - What device is used to program a PLC?
Ch. 38 - What device separates the central processing unit...Ch. 38 - What is opto-isolation?
Ch. 38 - Prob. 8RQCh. 38 - Prob. 9RQCh. 38 - Prob. 10RQ
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- The ratio of output to input of a system is known as Transfer function. Select one: O True O False Coloct the cinmple cuctom fcom the fellouuingarrow_forwardIdentify the following elements of the given closed loop control system.(i) Process Element(ii) Feedback Element (iii) Control Element (iv) Correction Elementarrow_forwardDifferentiate between microprocessor and micro-controller.arrow_forward
- I want you to draw a ladder logic diagram of a garage door to control it by PLC. In my case we have different inputs and outputs and all of them gotta be used in the diagram. I can perfectly interpret the diagram so no need to explain it, I will just require you to draw it. INPUTS : open push button ( OPB ) - close push button ( CPB ) - open limit switch ( OLS ) - close limit switch ( CLS ) - obstacle detection sensor ( ODS ) - safety sensor ( SS ) - emergency stop push button ( ESPB ) - reset button ( RB ) OUTPUTS : motor starts ( MS ) - motor stops ( MSTP ) - motor forward ( MF ) - motor reverse ( MR ) - Error display ( ER ) OPERATİNG MODES : automatic mode ( AM ) - manual mode ( MM ) NECESSARY TIMERS : T1 ( delay door movement after obstacle detection ) - T2 ( delay door movement after reversing ) Here is my excercise for today. Please I am requiring a good logic diagram taking into consideration all what was mentioned before. so to sum up, I want you to write a logic ladder diagram…arrow_forwardWhat industry first started using programmable logic controllers?arrow_forwardWhat is the sequence to do to simulate a control system with simulink?arrow_forward
- B. Use your own words to describe the method to derive the A-matrix that represents each joint of the SCARA robot above?(Hint: Use your own symbols for joint parameters and links’ lengths).C.Arrange the A-matrices described in part (B) in the correct order necessary to derive the kinematic matrix that defines the motion of the end-effector of the SCARA robot?arrow_forwardDraw the logic circuit diagram for the following function:arrow_forward7) Obtain a kinematic diagram (schematic view) equivalent to the following mechanisms and their degree of freedom.arrow_forward
- Name two differences between PLCs and common home or business computers.arrow_forward5. Study the ladder logic program in Figure 7-34 on page 198, and answer the questions that follow: a. What is the purpose of interconnecting the two timers? b. How much time must elapse before output PL is energized? c. What two conditions must be satisfied for timer T4:2 to start timing? d. Assume that output PL is on and power to the system is lost. When power is restored, what will the status of this output be? e. When input PB2 is on, what will happen? f. When input PB1 is on, how much accumulated time must elapse before rung 3 will be true? Ladder logic program L1 Inputs FIGURE 7-34 PB1 PB2 PB2 1 36 PB1 2 3 E 3 PB1 T4:2 DN T4:1 DN -RTO RETENTIVE TIMER ON Timer T4:1 Time base 1.0 Preset 2900 Accumulated RTO RETENTIVE TIMER ON Timer Time base Preset Accumulated T4:1 (RES) T4:2 (RES) (EN) 0 (DN) a. The input is true, and EN is 1, TT is 1, and DN is 0. b. The input is true, and EN is 1, TT is 1, and DN is 1. c. The input is false, and EN is 0, TT is 0, and DN is 0. d. The input is…arrow_forwardDesign ladder logic for a car that considers the variables below to control the motor M. Also add a second output that uses any outputs not used for motor control. - doors opened/closed (D) - keys in ignition (K) - motor running (M) - transmission in park (P) - ignition start (I)arrow_forward
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