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12 CONTROL AUXILIARY FUNCTIONS
(1) Control details
Md. 50 In speed change processing flag
(2) Precautions during control
Cd. 16 New speed value
Designated speed in P2
Designated speed in P1
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The following drawing shows the operation during a speed change.
Speed changes to V2.
V
Fig. 12.22 Speed change operation
(a) Control is carried out as follows at the speed change during continuous path
control.
1) When no speed designation (current speed) is provided in the next
positioning data:
The next positioning data is controlled at the " Cd.16 New speed
value".
2) When a speed designation (current speed) is provided in the next
positioning data:
The next positioning data is controlled at its command speed
( Da.7 ).
Positioning control
P1
Fig. 12.23 Speed change during continuous path control
(b) When changing the speed during continuous path control, the speed change
will be ignored if there is not enough distance remaining to carry out the
change.
12 - 36
Speed changes to V3.
V1
Operation during
positioning by V1.
V2
V3
Next control
P2
[a] When no speed designation
(current speed) is provided.
[b] When a speed designation
is provided.
Speed change
command
MELSEC-A
t
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