Allen-Bradley Logix5000

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