Motion Event Instructions
246 Rockwell Automation Publication MOTION-RM002H-EN-P-February 2018
Execution
Ladder Diagram
Condition/State Action Taken
Prescan The .EN, .DN, .ER, and .IP bits are cleared to false.
Rung-condition-in is false The .EN bit is cleared to false if either the .DN or .ER bit is true.
Rung-condition-in is true The .EN bit is set to true and the instruction executes.
Postscan N/A
Structured Text
Condition/State Action Taken
Prescan See Prescan in the Ladder Diagram table.
Normal execution See Rung-condition-in is false, followed by rung is true in the Ladder Diagram table.
Postscan See Postscan in the Ladder Diagram table.
Error Codes
See Motion Error Codes (.ERR) for Motion Instructions.
Extended Error Codes
Extended Error Codes provide additional instruction specific information for the
Error Codes that are generic to many instructions. See Motion Error Codes (.ERR)
for Motion Instructions.
Status Bits
MDW Changes to Status Bits
Bit Name State Meaning
WatchEventArmedStatus FALSE The axis is not looking for a watch position event.
WatchEventStatus FALSE The previous watch event is cleared.
Examples
When the input conditions are true, the controller disarms watch-position
event-checking for axis1.
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