Process Type Instructions - Allen-Bradley 1756 ControlLogix Instruction Manual

Process Type
Instructions
If the controller:
Does not detect an error when the
instruction executes
Detects an error when the instruction
executes
7. The next time the rung becomes false after either the .DN or .ER bit sets,
the controller clears the .EN bit.
8. When the rung becomes true, the controller can execute the instruction
again.
See also
Motion Direct Drive On (MDO)
Motion Redefine Position (MRP)
Process type motion instructions initiate motion processes that can take an
indefinite amount of time to complete.
Examples of process type instructions include the:
•
Motion Arm Watch Position (MAW) instruction
•
Motion Axis Move (MAM) instruction
Process type instructions work as follows:
1. When the rung that contains the motion instruction becomes true, the
controller:
Rockwell Automation Publication MOTION-RM002H-EN-P-February 2018
Then:
The controller sets the .DN bit.
The controller sets the .ER bit and stores an
error code in the control structure.
on page 56
on page 149
Preface
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