PART 5 REVIEW QUESTIONS 1. Construct a ControlLogix ladder rung with a math instruction that executes when a toggle switch is closed to add the tag named Pressure_A (value 680) to the constant of 50 and store the answer in the tag named Result. 2. Construct a ControlLogix ladder rung with a math instruction that executes when two normally open limit switches are closed to subtract the tag named Count_1 (value 60) from the tag named Count_2 (value 460) and store the answer in the tag named Count_Total. 3. Construct a ControlLogix ladder rung with a math instruction that executes when either one of two normally open pushbuttons is closed to multiply the tag named Cases (value 10) by the constant 24 and store the answer in the tag named Cans. 4. Construct a ControlLogix ladder rung with a compare instruction that will energize a pilot light output anytime the value stored at Data_3 is 60. 5. Construct a ControlLogix ladder rung with a compare instruction that will energize a pilot light output anytime the value stored at Data_2 is not the same as that stored at Data_6. 6. Construct a ControlLogix ladder rung with compare instructions that will energize a pilot light output anytime the pressure of a system goes above 300 psi or below 100 psi. PART 5 PROBLEMS 1. While checking the operation of the parts tracking system (Figure 15-80) with the Monitor Tags window, you note that the value of Conveyor_Sensor_1 remains at 1 with parts passing by. What can you surmise from this? Why? 2. Three conveyors are delivering the same parts in different packages. A package can hold 12, 24, or 18 parts. Proximity switches installed on each of the conveyor lines are used to advance the accumulated value of the three counters. Write a ControlLogix program that uses multiply and add instructions to calculate the sum of the parts. 3. A single pole switch is used in place of the two pushbuttons for the variable preset timer program (Figure 15-91). When this switch is closed the timer is to be set to 10 seconds and when open to 15 seconds. Make the necessary changes to the program. Math, Comparison, and Move Instructions Part 5 383
Petruzella_ProgrammableLogicControllers__5e
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