Copyright Goodheart-Willcox Co., Inc. Chapter 6 PLC Programming 119 • The force instruction provides a method of testing the PLC system without actually closing or opening input devices. The force condition must be used with extreme caution. • The seven commands for creating and printing PLC reports in the RSLogix 500 software are found in the File menu and include: Print View, Print Preview, Report Options, Report Preview, Print Report, Printer Setup, and Page Setup. Review Questions Answer the following questions using the information provided in this chapter. 1. How many output instructions can you place in series in a ladder logic diagram? 2. What processor type is used for the Allen-Bradley fixed SLC 500 PLC with twelve 120 VAC input ports and eight 120 VAC output ports? 3. Which slot must be reserved for a processor in the modular Allen-Bradley PLC system? 4. Which file holds the main PLC ladder logic diagram? 5. What are the following PLC input instruction types: XIO and XIC? 6. What steps do you take to place an input or output instruction in forced mode? 7. Which data file holds the error messages? 8. Should you use the PLC force instruction in an industrial plant when assembly line workers are present? Why or why not? 9. List the seven commands available for creating and printing. 10. Describe how to open and save a project. Complete each of the following sentences with the correct word(s). 11. You must energize the _____ coil to close an XIC Latch/Unlatch contact. 12. Bit addresses B3:0 through B3:255 or _____ through _____ may be used for latch/unlatch. 13. To latch or unlatch a contact, two _____ are used. 14. The PLC system can be tested without actually closing or opening input devices in the _____ mode. Specify whether the following statements are true or false. 15. You may use the PLC force instruction in a manufacturing plant when assembly line workers are present. 16. Two pushbuttons are typically used for each latch/unlatch instruction. 17. The Data File S2 dialog box displays the error messages. 18. In a PLC ladder logic diagram, you can place two or more output coils in series. 19. In a PLC ladder logic diagram, you can place two or more output coils in parallel. 20. In a PLC ladder logic diagram, you can place two or more contacts horizontally. 21. In a PLC ladder logic diagram, you can place two or more contacts vertically. 22. In a PLC ladder logic diagram, program execution flow must be from left to right.