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

9.2.6 1-axis fixed-feed control

In "1-axis fixed-feed control" ("[Da.2] Control method" = 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 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 1-axis 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
• Negative movement amount ............. Positioning control to reverse direction
0
Designated
Positioning
movement
amount
start
Reverse direction
Movement direction for
a negative movement amount
Restrictions
(1) The 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.)
(2) "Fixed-feed" cannot be set in "[Da.2] Control method" 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 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.
(Address increase direction)
(Address decrease direction)
0 0
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Chapter 9 Major Positioning Control
" Md. 20 Feed current
value" is set to "0" at
the positioning start
0 0
Stop position
Movement direction for
a positive movement amount
Forward direction