1-Axis Fixed-Feed Control - Mitsubishi Electric MELSEC-Q QD75M User Manual

9 MAJOR POSITIONING CONTROL

9.2.6 1-axis fixed-feed control

In "1-axis fixed-feed control" ("
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. (The remainder of the movement amount with an
accuracy below the control accuracy does not affect the regular controls.)
Operation chart
In 1-axis fixed-feed control, the address (
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 "
address/movement amount".
The movement direction is determined by the movement amount sign.
0
Positioning
Designated movement
amount
start
Reverse direction
Movement direction for
a negative movement amount
Restrictions
(1) An axis error "Continuous path control invalid (error code: 516)" will occur and
the operation cannot start if "continuous path control" is set in "
Operation pattern". ("Continuous path control" cannot be set in fixed-feed
control.)
(2) "Fixed-feed" cannot be set in "
when "continuous path control" has been set in "
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.) An axis error "Continuous path control invalid
(error code: 516)" will occur and the machine will carry out a deceleration stop
if this type of setting is carried out.
Da.2
Control system" = fixed-feed 1), one motor is
Md.20
0 0
Da.2
Control system" in the positioning data
9 - 44
Current feed value) of the current
Da.6
Positioning
" Md. 20 Current feed
value" is set to "0" at
the positioning start
0 0
Stop position
Movement direction for
a positive movement amount
Da.1 Operation pattern" of
MELSEC-Q
Forward direction
Da.1