Motion Group Instructions
222 Rockwell Automation Publication MOTION-RM002H-EN-P-February 2018
This is a transitional instruction:
• In relay ladder, toggle Rung-condition-in from false to true each time the
instruction should execute.
• In structured text, condition the instruction so that it only executes on a
transition.
Master Driven Speed Control (MDSC) and the MGSD Instruction
When the group shuts down:
• The IP bit of the Master Driven Axis Control (MDAC) and Master Driven
Coordinate Control (MDCC) instructions reset as the group is shutdown.
• The AC bit of the MDAC and MDCC instructions are reset when the axis
is stopped as the group is shutdown.
• The MGS instruction clears the pending Master Axis for all future single
and coordinated motion instructions.
Affects Math Status Flags
No
Major/Minor Faults
None specific to this instruction. See Common Attributes for operand-related
faults.
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.
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