Logic Gates / PLC

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Across
  1. 4. Contacts on left of Ladder
  2. 6. Boolean A'B' + AB
  3. 8. Boolean A+B
  4. 9. Boolean A'+ B'
  5. 11. only one of two states
  6. 13. What is the "I" in I:0/2
  7. 16. OTL
  8. 18. True path across PB
  9. 19. Type of I/O
  10. 22. OTU
  11. 23. What is the "2" in I:0/2
  12. 24. Type of I/O
  13. 26. Boolean A'B'
  14. 27. OTE
  15. 28. Contact State
Down
  1. 1. What is "0" in I:0/2
  2. 2. Examine if Closed
  3. 3. Timer EN bit
  4. 5. What is PLC
  5. 6. Boolean A'B + AB'
  6. 7. Boolean AB
  7. 10. True path in PLC
  8. 12. Inverts the input
  9. 14. Timer TT bit
  10. 15. Contact State
  11. 17. How many bits in a word
  12. 19. TOF
  13. 20. XIO
  14. 21. Timer DN bit
  15. 25. Most common type of timer