Allen-Bradley Logix5000

Rockwell Automation Publication 1756-RM003N-EN-P - October 2011 405
Array (File)/Shift Instructions (BSL, BSR, FFL, FFU, LFL, LFU) Chapter 9
Example 1: When enabled, the BSL instruction starts at bit 0 in array_dint [0]. The instruction unloads array_dint[0].9 into the .UL bit, shifts the remaining bits, and load s input_1 into array_dint[0].0. The values in the remaining bits (10…31) are invalid.
Example 2: When enabled, the BSL instruction starts at bit 0 in array_dint [0]. The instruction unloads array_dint[1].25 into the .UL bi t, shifts the remaining bit s, and loads input_1 into array_dint[0].0. The values in th e remaining bits (31…26 in array_dint[1]) are invalid. Note how array_dint[ 0].31 shif ts across words to array_dint[1].0.
9876543210
array_dint[0]
Before shift
11110000111100001111000011110000
9876543210
array_dint[0]
After shift
0111100001
1
input_1
0
.UL bit
These bits shift left
31 0
array_dint[0] 11110000111100001111000011110000
31 0
array_dint[1] 00111100001111000011110000
1
input_1
These bits shift left
0
.UL bit
These bits shift left