Chapter 3 Cam Function; Control Details For Cam Function - Mitsubishi Electric MELSEC iQ-R RD78G4 User Manual

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CAM FUNCTION
The details on cam data and operation for cam function in output axis (cam axis) are explained in this chapter.
The cam function controls output axis by creating cam data that corresponds to the operation.
The functions to operate cam data include "Cam data operation function", "Cam auto-generation function", and "Cam position
calculation function".
Refer to the following for the setting of the output axis.
Page 91 ADVANCED SYNCHRONOUS CONTROL
Refer to the following for the cam position calculation function.
Page 159 Cam Position Calculation Function
3.1

Control Details for Cam Function

The output axis for synchronous control is operated with a cam.
The following operations can be performed with cam functions.
• Two-way operation: Reciprocating operation with a constant cam strokes range.
• Feed operation: Cam reference position is updated every cycle.
• Linear operation: Linear operation (cam No.0) in the cycle as the stroke ratio is 100%.
The output axis is controlled by a value (command position value), which is converted from the input value (cam axis position
value per cycle) by cam data.
Two-way operation
Cam data
Cam axis position
value per cycle
Command position
value
(User created cam)
Feed operation
Cam data
Cam axis position
value per cycle
Command position
value
(User created cam)
Linear operation
Cam data
Cam axis position
value per cycle
Command position
value
(Linear cam: Cam No.0)
Cam
conversion
processing
Cam
conversion
processing
Cam reference
position
(At 1st cycle)
Cam
conversion
processing
Cam reference
position
(At 1st cycle)
Cam reference
Cam reference
position
position
(At 3rd cycle)
(At 2nd cycle)
Cam reference
position
Cam reference
(At 3rd cycle)
position
(At 2nd cycle)
Stroke amount × 100%
3.1 Control Details for Cam Function
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3 CAM FUNCTION
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