Rockwell Automation Publication 1756-RM003N-EN-P - October 2011 509
Special Instructions (FBC, DDT, DTR, PID) Chapter 13
Fault Conditions: None
Execution:
Condition Relay Ladder Action
Prescan The Reference = Source AND Mask.
The rung-condition-out is set to false.
Rung-condition-in is false The Reference = Source AND Mask.
The rung-condition-out is set to false.
Postscan The rung-condition-out is set to false.
Rung-condition-in is true
end
masked source =
reference
no
yes
reference is set equal to masked source
rung-condition-out is set to true
rung-condition-out is set
to false
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