Bundle: Understanding Motor Controls, 4th + Mindtap Electrical, 2 Terms (12 Months) Printed Access Card
4th Edition
ISBN: 9780357097755
Author: Stephen L. Herman
Publisher: Cengage Learning
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Textbook Question
Chapter 39, Problem 7RQ
A PLC requires that times be programmed in 0.1-second intervals. What number should be entered to produce a time delay of 3 minutes?
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An emergency stop system is to be designed for a certain automatic production machine. A single “start” button is used to turn on the power to the machine at the beginning of the day. In addition, there are two “stop” buttons located at two locations on the machine, either of which can be pressed to immediately turn off power to the machine. Let X1 = start button (normally open), X2 = stop button 1 (normally closed), X3 = stop button 2 (normally closed), and Y = power-to-machine. (a) Construct the truth table for this system. (b) Write the Boolean logic expression for the system. (c) Construct the ladder logic diagram for the system
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…
2) The continuous stopwatch timing method was used to obtain the observed times for a
worker-machine task. Only one cycle was timed. The data are recorded in the table below.
The times are listed indicate the stopwatch reading at the end of the element. Elements
a, b, and d are worker-controlled elements. Element c is machine controlled. Elements a
and d are external to the machine-controlled element, while element b is internal. Every
four cycles, there is an irregular worker element that takes 1.32 min rated at 100%
performance. For determining the standard time, the PFD allowance is 15% and the
machine allowance is 30%. Determine
a. The normal time
b. Standard time for the cycle
c. If worker efficiency is 100%, how many units will be produced in one 8-hour shift?
d. If the actual time worked during the shift is 6.86 hours, and the worker
performance is 125%, how many units will be produced?
Description of
Worker
Time
Description of
(min) Rating (%) Element Machine Element
Worker…
Chapter 39 Solutions
Bundle: Understanding Motor Controls, 4th + Mindtap Electrical, 2 Terms (12 Months) Printed Access Card
Ch. 39 - Why are NEMA symbols such as push buttons, float...Ch. 39 - Prob. 2RQCh. 39 - Why are normally closed components such as STOP...Ch. 39 - Prob. 4RQCh. 39 - Prob. 5RQCh. 39 - List four basic rules for developing a program for...Ch. 39 - A PLC requires that times be programmed in...Ch. 39 - When programming in Boolean, what statement should...Ch. 39 - When programming in Boolean, what statement should...Ch. 39 - In a control circuit, it is imperative that a coil...
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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 sarrow_forwardWhat is a modal code?arrow_forwardSupposing a programmer, using absolute mode, mistakenly entered Z-3.689, when he or she intended to enter Z3.689. Describe what would happen, and how far the actual position would be from the intended position.arrow_forward
- 5. You need to know the resolution of the control. How many counts are there for 1 degree of motion?arrow_forwardExamine the following while loops and determine the value of ires at the end of each of the loops, and the number of times each loop executes. (a) ires - 1; while mod (ires, 21) = 0 iresires + 1; end ires = number of times ires= 2; while ires 100 iresires^2; end number of times (b) (c)arrow_forwardName the four basic sections of a programmable logic controller.arrow_forward
- Why are normally closed components such as STOP push buttons programmed normally open instead of normally closed when entering a program into the memory of a PLC?arrow_forwardName Section 5-2: Line Diagrams-Signals, Decisions, and Actions In the following application, a temperature switch controls a heating contactor and a flow switch is used to ensure there is enough air flow. If there is not enough air flow, an alarm is sounded. Complete the required information. 1. List all the signal devices in the circuit. 2. List all the action devices in the circuit. 3. List the decision part of the circuit that automatically sounds the alarm if there is a problem. 4. When the heating element is on during normal operation, is the flow switch open or closed? CIRCULATING 2 L1 FAN TEMPERATURE SWITCH TR HEATING ELEMENTS FLOW SWITCH -HOT AIR PADDLE AIR FILTER NORMALLY CLOSED FLOW SWITCH 65 ALARM (SOUNDS IF NO FLOW FOR 15 SECONDS OR MORE) Date HEATING CONTACTOR TR ON-DELAY TIMER SUPPLY AIR COLD AIR (3) TIME SET= 15 SEC © 2014 American Technical Publishers, Inc. All rights reservedarrow_forwardestion 1 The step resolution of a stepper motor is set for 1024 steps per revolution, Find the frequency to rotate at 60 rpm. (Give your answer in Hertz, put only numeric value) Question 3 A proportional valve is handled by an PWM signal Question 4 The speed of a stepper motor is controlled by Question 5 The relay is driven by an analog signal Question 6 Determine the output voltage from a PWM pin when the time ON is 25 ms and the frequency is 1kHz and Vcc-SV. (Put only a number in Volt, no need to add the unit word)arrow_forward
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