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9 MAIN POSITIONING CONTROL
[When the speed cannot change over in P2]
When the relation of the speeds is P1 =
P4, P2 = P3, P1 < P2.
P1
P2
Positioning start signal
Start complete signal
BUSY signal
Positioning complete signal
P3
P4
2)
Front-loading speed changeover mode
(1) When the "positioning data for current operation" and "positioning
data for next operation" differ in command speed, acceleration or
deceleration starts during positioning executed with the
"positioning data for current operation", and the speed set in the
"positioning data for next operation" is reached at completion of
the positioning.
(2) 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 changeover will not be carried out if the command speeds
are the same.
V
Positioning
peration pattern
Da. 1 O
[RY(n+1)0, RY(n+1)1]
OFF
[RXn1, RXn2]
OFF
[RXn4, RXn5]
OFF
[RXn7, RXn8]
OFF
Fig. 9.5 Operation for the front-loading speed changeover mode
[When the movement amount is small during
automatic deceleration]
The movement amount required to carry out the
automatic deceleration cannot be secured, so the
machine immediately stops in a speed 0 status.
11
11
11
ON
ON
ON
ON
9 - 12
MELSEC-A
Positioning address.
Dwell time
Dwell time
01
00
t
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