Loop - Mitsubishi Electric MELSEC-L LD75P User Manual

9.2.24

LOOP

The LOOP is used for loop control by the repetition of LOOP to LEND.
(1) Operation
The LOOP to LEND loop is repeated by set repeat cycles.
(2) Positioning data setting example
The following table shows the setting examples when "LOOP" is set in positioning data No. 1 of axis 1.
Setting item
[Da.1] Operation pattern
[Da.2] Control system
[Da.3] Acceleration time No.
[Da.4] Deceleration time No.
[Da.5] Axis to be interpolated
Axis 1
positioning
Positioning
[Da.6]
data No. 1
address/movement amount
[Da.7] Arc address
[Da.8] Command speed
[Da.9] Dwell time
[Da.10] M code
Refer to  Page 152, Section 5.3 for information on the setting details.
(3) Restrictions
• The error "Control system LOOP setting error" (error code: 545) will occur if "0" is set for the repeat cycles.
• Even if LEND is absent after LOOP, no error will occur, but repeat processing will not be carried out.
• Nesting is not allowed between LOOP-LEND's. If such setting is made, only the inner LOOP-LEND is
processed repeatedly.
The setting by this control system is easier than that by the special start "FOR loop" of "High-level Positioning Control" (
Page 456, CHAPTER 10).
<Setting data>
• For special start: Positioning start data, special start data, condition data, and positioning data
• For control system: Positioning data
For the special start FOR to NEXT, the positioning data is required for each of FOR and NEXT points. For the control system,
loop can be executed even only by one data.
Also, nesting is enabled by using the control system LOOP to LEND in combination with the special start FOR to NEXT.
However LOOP to LEND cannot be set across block. Always set LOOP to LEND so that the processing ends within one
block. Refer to Page 456, Section 10.1 for details of the "block".
454
Setting example

Setting not required. (Setting value will be ignored.)
LOOP Set the LOOP.
 Setting not required. (Setting value will be ignored.)

Setting not required. (Setting value will be ignored.)
 Setting not required. (Setting value will be ignored.)
 Setting not required. (Setting value will be ignored.)

Setting not required. (Setting value will be ignored.)

Setting not required. (Setting value will be ignored.)

Setting not required. (Setting value will be ignored.)
5 Set the LOOP to LEND repeat cycles.
Setting details