1-Axis Fixed-Feed Control - Mitsubishi Electric MELSEC-L LD75P User Manual

9.2.6

1-axis fixed-feed control

In "1-axis fixed-feed control" ("[Da.2] Control system" = fixed-feed 1), one motor is used to carry out fixed-feed control
in a set axis direction.
In fixed-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.
(1) Operation chart
In 1-axis fixed-feed control, the address ([Md.20] Current feed 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 sign of the
movement amount.
Positioning
start
Reverse direction
(2) Restrictions
• The axis error "Continuous path control not possible" (error code: 516) will occur and the operation cannot
start if "continuous path control" is set in "[Da.1] Operation pattern". ("Continuous path control" cannot be set
in fixed-feed control.)
• "Fixed-feed" cannot be set in "[Da.2] Control system" in the positioning data when "continuous path control"
has been set in "[Da.1] Operation pattern" of the immediately prior positioning data. (For example, if the
operation pattern of positioning data No. 1 is "continuous path control", fixed-feed control cannot be set in
positioning data No. 2.) The axis error "Continuous path control not possible" (error code: 516) will occur and
the machine will carry out a deceleration stop if this type of setting is carried out.
0 0 0
Designated movement
amount
Movement direction for
a negative movement amount
CHAPTER 9 MAJOR POSITIONING CONTROL
" Md. 20 Current feed
value" is set to "0" at
the positioning start
0 0
Stop position
Movement direction for
a positive movement amount
Forward direction
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