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2. Use a flow chart to design a parking gate controller. -the gate will be raised by one output and lowered by another. If the gate gets stuck an over current detector will make a PLC input true. If this is the case the gate should reverse and the light should be turned on indefinitely. -if a valid keycard is entered a PLC input will be true. The gate is to rise and stay open for 10 seconds. -when a car is over the car detector a PLC input will go true. The gate is to open while this detector is active. If it is active for more that 30 seconds the light should also turn on until the gate closes. plc flowchart -11.27 3. A welding station is controlled by a PLC. On the outside is a safety cage that must be closed while the cell is active. A belt moves the parts into the welding station and back out. An inductive proximity sensor detects when a part is in place for welding, and the belt is stopped. To weld, an actuator is turned on for 3 seconds. As normal the cell has start and stop push buttons. a) Draw a flow chart b) Implement the chart in ladder logic PART PRESENT 1. Convert the following flowchart to ladder logic. Easy Access To All Pages 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 |
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