Rockwell Automation Publication 1756-RM006K-EN-P - November 2018 409
Description
The Reset Dominant instruction uses the Set and Reset input parameters to
control latched output parameters Out and OutNot. The Reset input has
precedence over the Set input.
Out will be latched true whenever the Set input parameter is set true. Setting the
Reset parameter to true will override the current state of Out, setting Out to false.
When Reset returns to false, Out will be latched to the current state of the Set
input parameter. OutNot will be set to the opposite state of Out.
Affects Math Status Flags
No
Major/Minor Faults
None specific to this instruction. See Common Attributes for fault related
attributes.
Execution
Function Block
Condition/State Action Taken
Prescan EnableIn and EnableOut bits are cleared to false.
Tag.EnableIn is false EnableIn and EnableOut bits are cleared to false.
Tag.EnableIn is true EnableIn and EnableOut bits are set to true.
The instruction executes.
Instruction first run Previous Out is set to False.
Instruction first scan N/A
Postscan EnableIn and EnableOut bits are cleared to false.
Structured Text
Condition/State Action Taken
Prescan See Prescan in the Function Block table.
Normal Execution See Tag.EnableIn is true in the Function Block table.
Postscan See Postscan in the Function Block table.
Example
When Set is true and Reset is false, Out is set true. When Reset is true, Out is
cleared. The Reset input has precedence over the Set input. The RESD instruction
sets OutNot to the opposite state of Out.
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