56
3 MAJOR POSITIONING CONTROL
3.1 Outline of Major Positioning Controls
■
Speed switching (Standard speed switching mode: Switch the speed when executing the next
positioning data.) (
Page 421 [Pr.19] Speed switching mode)
• If the respective command speeds differ in the "positioning data currently being executed" and the "positioning data to carry
out the next operation", the machine will accelerate or decelerate after reaching the positioning point set in the "positioning
data currently being executed" and the speed will change over to the speed set in the "positioning data to carry out the next
operation".
• The parameters used in acceleration/deceleration to the command speed set in the "positioning data to carry out the next
operation" are those of the positioning data to carry out acceleration/deceleration. Speed switching will not be carried out if
the command speeds are the same.
■
RD77MS4 operation example
• If the movement amount is small in regard to the target speed, the current speed may not reach the target speed even if
acceleration/deceleration is carried out. In this case, the machine is accelerated/decelerated so that it nears the target
speed. If the movement amount will be exceeded when automatic deceleration is required (Ex. Operation patterns "00",
"01", etc.), the machine will immediately stop at the designated positioning address, and the warning "Insufficient
movement amount" (warning code: 0998H) will occur.
[When the speed cannot change over in P2]
[When the movement amount is small during automatic
deceleration]
For the following relation of the speed P1 = P4, P2 = P3, P1 < P2
The movement amount required to carry out the automatic deceleration
cannot be secured, so the machine immediately stops in a speed
0 status.
OFF
ON
OFF
ON
OFF
ON
OFF
ON
Positioning
[Da.1] Operation pattern
11
11
11
01
00
V
Dwell time
t
Speed
switching
Dwell time
Positioning start signal
[Y10, Y11, Y12, Y13]
Start complete signal ([Md.31] Status: b14)
BUSY signal
[X10, X11, X12, X13]
Positioning complete signal
([Md.31] Status: b15)
P1
P2
P3
P4
Positioning address.
Pn
Pn + 1
Содержание RD77MS16
Страница 1: ...MELSEC iQ R Simple Motion Module User s Manual Application RD77MS2 RD77MS4 RD77MS8 RD77MS16 ...
Страница 2: ......
Страница 316: ...314 9 COMMON FUNCTIONS 9 4 External Input Signal Select Function Program example ...
Страница 317: ...9 COMMON FUNCTIONS 9 4 External Input Signal Select Function 315 9 ...
Страница 574: ...572 13 PROGRAMMING 13 4 Positioning Program Examples Parameter initialization program Flash ROM write program ...
Страница 575: ...13 PROGRAMMING 13 4 Positioning Program Examples 573 13 Error reset program Axis stop program ...
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