140 Programmable Logic Controllers: Hardware and Programming
Specify if 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 in vertically.
22. In a PLC ladder logic diagram, program execution flow must be from left to right.