Mitsubishi Electric MELSEC-Q Series User Manual page 414

Positioning
Da. 1 Operation pattern
Positioning start signal
[Y10 to Y1F]
Start complete signal
( Md.31 Status:b14)
[X10 to X1F]
BUSY signal
Positioning complete signal
( Md.31 Status:b15)
Fig. 9.5 Operation for the front-loading speed switching mode
[When the speed cannot change over to
the P2 speed in P1]
For the following relation of the speed
P1 = P4, P2 = P3, P1 < P2
P1 P2
V
11 11
ON
OFF
ON
OFF
ON
OFF
ON
OFF
3) Speed switching condition
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: 513) will occur.
[When the movement amount is small during
automatic deceleration]
P3 P4
9 - 14
Chapter 9 Major Positioning Control
Dwell time
11 01
The movement amount required to carry out the
automatic deceleration cannot be secured, so the
machine immediately stops in a speed  0
status.
Pn
Dwell time
00
Pn+1
Positioning address
t