Allen-Bradley Logix5000

Rockwell Automation Publication 1756-RM003N-EN-P - October 2011 409
Array (File)/Shift Instructions (BSL, BSR, FFL, FFU, LFL, LFU) Chapter 9
Example 1: When enabled, the BSR instruction starts at bit 9 in array_dint[0]. The
instruction unloads array_dint[0].0 into the .UL bit, shifts the remaining bits
right, and loads input_1 into array_dint[0].9. The values in the remaining bits
(10…31) are invalid.
Example 2: When enabled, the BSR instruction starts at bit 25 in array_dint[1]. The
instruction unloads array_dint[0].0 into the .UL bit, shifts the remaining bits
right, and loads input_1 into array_dint[1].25. The values in the remaining bits
(31…26 in dint_array[1]) are invalid. Note how array_dint[1].0 shifts across
words into array_dint[0].31.
9876543210
array_dint[0]
Before shift
11110000111100001111000011110000
9876543210
array_dint[0]
After shift
1001111000
These bits shift right
0
.UL bit
1
input_1
31 0
array_dint[0] 11110000111100001111000011110000
31 0
array_dint[1] 00111100001111000011110000
These bits shift right
0
.UL bit
These bits shift right
1
input_1