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9 MAIN POSITIONING CONTROL
9.2.4 1-axis fixed-dimension feed control
Positioning
start
In "1-axis fixed-dimension feed control" (" Da.2 Control method" = fixed-dimension
feed 1), one motor is used to carry out fixed-dimension feed control in a set axis
direction.
In fixed-dimension feed control, any remainder of the movement amount designated in
the positioning data is rounded down if less than that required for control accuracy to
output the same amount of pulses.
Operation chart
In 1-axis fixed-dimension feed control, the address (Current feed value RWrn + 0
to 1, RWrn + 8 to 9) 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.5 Positioning address/movement amount".
The movement direction is determined by the movement amount sign.
0
0
Designated movement
amount
Reverse direction
Movement direction for
a negative movement amount
0
0
Stop position
9 - 29
MELSEC-A
"Current feed value (RWrn + 0 to 1,
RWrn + 8 to 9)" is set to "0" at the
positioning start
0
Movement direction for
a positive movement amount
Forward direction
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