Allen-Bradley Logix5000 Reference Manual page 438

Chapter 10 Sequencer Instructions (SQI, SQO, SQL)
Condition:
Prescan
Rung-condition-in is false
Rung-condition-in is true.
.LEN ≤ 0 .POS < 0
or
.POS > .LEN
.ER bit is set.
Rung-condition-out is set to false.
Postscan
438
Relay Ladder Action
The rung-condition-out is set to false.
The rung-condition-out is set to false.
No
Yes
No
End
The rung-condition-out is set to false.
Rockwell Automation Publication 1756-RM003N-EN-P - October 2011
.ER bit is cleared.
Masked Source =
MaskedArray[.POS]
yes
Rung-condition-out is set to true.