Fixed-Feed Control - Mitsubishi Electric MELSEC iQ-R Series User Manual

Fixed-feed control

In "fixed-feed control" ("[Da.2] Control method" = fixed-feed 1, fixed-feed 2, fixed-feed 3, fixed-feed 4), the motor of the
specified axis is used to carry out fixed-feed control in a set axis direction.
In fixed-feed control, any remainder of below control accuracy is rounded down to convert the movement amount designated
in the positioning data into the command value to servo amplifier.
Operation chart
In fixed-feed control, the address ([Md.20] Feed current value) of the current stop position (start point address) is set to "0".
Positioning is then carried out to a position at the end of the movement amount set in "[Da.6] Positioning address/movement
amount". The movement direction is determined by the movement amount sign.
• Positive movement amount: Positioning control to forward direction (Address increase direction)
• Negative movement amount: Positioning control to reverse direction (Address decrease direction)
Ex.
1-axis fixed-feed control
0
Designated
movement
Positioning
amount
start
Reverse direction
Ex.
2-axis fixed-feed control
Y axis
Designated
movement amount
3 MAJOR POSITIONING CONTROL
76
3.2 Setting the Positioning Data
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0 0
Movement direction for a
negative movement amount
"[Md.20] Feed current value" of each axis
is set to "0" at the positioning start
(0,0)
(0,0)
Designated
movement amount
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"[Md.20] Feed current value"
is set to "0" at the positioning start
0 0
Stop position
Movement direction for a
positive movement amount
(0,0)
Forward direction
X axis