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I will upload two files. the first one is the chapter that you need to answer the questions. there is 3 questions and 7 excercies . answer each questions in you own words and make sure it's at least a paragraph. and if you take something from the internet make sure you reference it . if you need any questions let me know.

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EIND 371 Chapter 9b Review Questions REVIEW QUESTIONS 9.5 What is the difference between a delay-off timer and a delay-on timer? 9.6 What is the difference between an up counter and a down counter? 9.13 Are CTD and CTU counters retentive? Explain. PROBLEMS 9.7 Draw a PLC ladder program that turns solenoid A “on” when switch SW1 closes, then turns solenoid B on 25 seconds later. 9.8 Draw a ladder program that turns both E and F on by a switch. When the switch is turned off, E goes off immediately. F remains on for another 7 seconds, and then goes off. 9.9 Draw a PLC ladder program that turns on a light (L1) when a count reaches 30, then turns L1 off when the count reaches 50. A start button resets the counters. 9.10 In a section of a one-way conveyor, parts pass sensor A as they enter the section and pass sensor B as they exit. Draw a PLC ladder program that turns a solenoid “on” whenever there are 10 parts or more between sensor A and sensor B. You may assume a start-up condition where the conveyor is empty (i.e., zero parts between A and B). 9.12 Draw a PLC ladder program that turns an output “off” after an event has occurred 35,000 times. 9.13 An industrial robot performs a machine loading and unloading operation. A PLC is used as the robot cell controller. The cell operates as follows: (1) a human worker places a work part into a nest, (2) the robot reaches over and picks up the part and places it into an induction heating coil, (3) a time of 10 seconds is allowed for the heating operation, and (4) the robot reaches in and retrieves the part and places it on an outgoing conveyor. A limit switch X1 (normally open) will be used in the nest to indicate part presence in step (1). Output contact Y1 will be used to signal the robot to execute step (2) of the work cycle. This is an output contact for the PLC, but an input interlock for the robot controller. A photocell X2 is used to indicate that the part has been placed into the induction heating coil C1. Timer T1 will be used to provide the 10 second heating cycle in step (3). Output contact Y2 will be used to signal the robot to execute step (4). Construct the ladder logic diagram for the system. 9.14 The following ladder diagram was generated by a student as a solution to Part A of the fill tank PLC example we tackled in class (see also Example 9.6 in the textbook). Complete the timing diagram on the next page indicating how each output will respond to the X1 and FS inputs as shown; and determine whether this ladder program meets the problem objectives. ( X1 ) S1 FS S1 FS T1/TT X1 ( TON ) T1 Preset = 120 sec. ( TOF ) T2 Preset = 90 sec. ( T2/TT ) S2 X1 FS S1 S2 T1/TT T1/DN T2/TT T2/DN T1/ACC T2/ACC 0 30 60 90 120 150 180 210 240 270 sec.
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