388
9.2.9
4-axis fixed-feed control (interpolation)
In "4-axis fixed-feed control" ("[Da.2] Control system" = fixed-feed 4), four motors are used to carry out fixed-feed
control in a linear path while carrying out interpolation for the axis directions set in each axis.
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.
(Refer to
Page 359, Section 9.1.6 for details on interpolation control.)
(1) Operation chart
In incremental system 4-axis fixed-feed control, the addresses ([Md.20] Current feed value) of the current stop
position (start addresses) of every axes are set to "0". Linear interpolation positioning is then carried out from that
position 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.
(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.)
• For 4-axis fixed-feed control, set "1: Reference axis speed" in "[Pr.20] Interpolation speed designation
method". The error "Interpolation mode error" (error code: 523) will occur and the operation cannot start if "0:
Composite speed" is set.
• "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.
Summary of Contents for MELSEC-L LD75D
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Page 267: ...265 CHAPTER 6 PROGRAM USED FOR POSITIONING CONTROL 6 6 4 Positioning Program Examples ...
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Page 272: ...270 Z ABRST1 instruction execution ...
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Page 685: ...683 APPENDICES A Appendix 1 Function Update Appendix 1 1 Function comparison Memo ...
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