Chapter 13 PLC Logic and Bit Shift Instructions 293
14. The enable coil is ______ when a normally open input switch to
the bit shift right (BSR) instruction is closed.
15. In a bit shift right (BSR) instruction that uses the R6:0 register,
the done coil ______ is energized when the BSR instruction has
shifted all the bits as specified by the length.
16. The ______ bit must be used to bring the BSR instruction
position to the start position.
17. For every low-to-high input switch transition on the bit shift
right (BSR) instruction, data bits will shift ______ once.
Specify if the following statements are true or false.
18. You may use registers R6:0 through R6:255 for control registers
in bit shift instructions.
19. The R6:0/DN bit can be used to reset the BSL instruction.
20. Usually, the N7 data file holds the bits for the bit shift left (BSL)
instruction.
21. Usually, the B3 data file holds the bits for the bit shift right (BSR)
instruction.
22. The B10 data file can hold the bits for the bit shift left (BSL)
instruction.
23. The R6:0/EN is energized when the input to the bit shift left
(BSL) is closed.
24. The reset (RES) instruction is used to reset the BSL and BSR
instructions.
25. Usually the T4:0/DN contact of a timer ON-delay instruction is
used as an input instruction to bit shift instructions.