Mitsubishi Electric MELSEC iQ-R RD78G4 - Page 20

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1 OUTLINE OF ADVANCED SYNCHRONOUS CONTROL
1.1 Outline of Synchronous Control
■Input axis
• Input axis module
■Output axis
• Main shaft module
• Auxiliary shaft module
Name Parts Function description Maximum number of usable items Reference
per module per axis
RD78G4 RD78G8 RD78G16
Servo input axis  • Used to drive the input axis with the
position of the servo motor controlled by
the Motion module.
4816 Page 28 Servo
Input Axis
Command
generation axis
 • Used to drive the input axis by generating
only the position command based on the
positioning data of the command
generation axis.
488  Page 35 Command
Generation Axis
Synchronous
encoder axis
 • Used to drive the input axis with input
pulse from the synchronous encoder.
4816 Page 55
Synchronous
Encoder Axis
Name Parts Function description Maximum number of usable items Reference
per module per axis
RD78G4 RD78G8 RD78G16
Main shaft main
input axis
• The input axis on the main side of the
main shaft module.
• The reference position on the main shaft.
4 8 16 1 Page 91 Main
Shaft Module
Main shaft sub
input axis
• The input axis on the sub side of the main
shaft module.
• It is used to input the compensation
amount for the position of the main shaft
main input axis.
4 8 16 1 Page 91 Main
Shaft Module
Composite main
shaft gear
• The composite movement amount of the
main shaft main input axis and the main
shaft sub input axis are transmitted to the
main shaft gear.
4 8 16 1 Page 91 Main
Shaft Module
Main shaft gear • The converting movement amount after
composite main shaft gear is transmitted
by the setting gear ratio.
4 8 16 1 Page 91 Main
Shaft Module
Main shaft clutch • The movement amount of the main shaft
is transmitted by the clutch ON/OFF.
4 8 16 1 Page 91 Main
Shaft Module
Page 108 Clutch
Name Parts Function description Maximum number of usable items Reference
per module per axis
RD78G4 RD78G8 RD78G16
Auxiliary shaft • The input axis of the auxiliary shaft
module.
4 8 16 1 Page 100 Auxiliary
Shaft Module
Auxiliary shaft
gear
• The movement amount of the auxiliary
shaft is transmitted by the set gear ratio.
4 8 16 1 Page 100 Auxiliary
Shaft Module
Auxiliary shaft
clutch
• The movement amount of the auxiliary
shaft is transmitted by the clutch ON/
OFF.
4 8 16 1 Page 100 Auxiliary
Shaft Module
Page 108 Clutch
Composite
auxiliary shaft
gear
• The composite movement amount of the
main shaft and auxiliary shaft is
transmitted.
4 8 16 1 Page 100 Auxiliary
Shaft Module