24. Under what condition is a ladder logic rung said to have logic continuity? 25. Electrical devices and signals can be divided into two categories: analog and digital. What A B Y C D E A B C D Y 96 Chapter 5 Basics of PLC Programming is the major difference between these two categories? 26. Compare the way memory space is assigned and referenced in rack-based and tag-based PLCs. A B Y C D E A B C D E Y 4. Redraw the program shown in Figure 5-57 corrected to solve the problem of some logic ignored. 5. Redraw the program shown in Figure 5-58 corrected to solve the problem of too many series contacts (only four allowed). 6. Draw the equivalent ladder logic program used to implement the hardwired circuit drawn in Figure 5-59, wired using: a. A limit switch with a single NO contact connected to the PLC discrete input module b. A limit switch with a single NC contact connected to the PLC discrete input module CHAPTER 5 PROBLEMS 1. Assign each of the following discrete input and output addresses based on the SLC 500 format. a. Limit switch connected to terminal screw 4 of the module in slot 1 of the chassis. b. Pressure switch connected to terminal screw 2 of the module in slot 3 of the chassis. c. Pushbutton connected to terminal screw 0 of the module in slot 6 of the chassis. d. Pilot light connected to terminal screw 13 of the module in slot 2 of the chassis. e. Motor starter coil connected to terminal screw 6 of the module in slot 4 of the chassis. f. Solenoid connected to terminal screw 8 of the module in slot 5 of the chassis. 2. Redraw the program shown in Figure 5-55 corrected to solve the problem of a nested contact. 3. Redraw the program shown in Figure 5-56 corrected to solve the problem of a nested vertical programmed contact. Figure 5-58 Program for Problem 5. L2 LS1 SOL A SOL B L1 Figure 5-59 Hardwired circuit for Problem 6. Figure 5-55 Program for Problem 2. Figure 5-56 Program for Problem 3. Figure 5-57 Program for Problem 4.
Petruzella_ProgrammableLogicControllers__5e
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