3 MAJOR POSITIONING CONTROL
3.1 Outline of Major Positioning Controls
57
3
■
Speed switching (Front-loading speed switching mode: The speed switches at the end of the
positioning data currently being executed.) (
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 speed will change over to the speed set in the "positioning data to carry out the next operation"
at the end of the "positioning data currently being executed".
• 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 to the P2 speed in P1]
[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
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)
Dwell time
P1
P2
P3
P4
Positioning address.
Pn
Pn + 1
Summary of Contents for RD77MS16
Page 1: ...MELSEC iQ R Simple Motion Module User s Manual Application RD77MS2 RD77MS4 RD77MS8 RD77MS16 ...
Page 2: ......
Page 316: ...314 9 COMMON FUNCTIONS 9 4 External Input Signal Select Function Program example ...
Page 317: ...9 COMMON FUNCTIONS 9 4 External Input Signal Select Function 315 9 ...
Page 575: ...13 PROGRAMMING 13 4 Positioning Program Examples 573 13 Error reset program Axis stop program ...
Page 643: ......