12 - 45
MELSEC-Q
12 CONTROL SUB FUNCTIONS
[2] Precaution during control
(1) 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.
(2) A warning "Deceleration/stop speed change (warning code: 500)" occurs
and the speed cannot be changed in the following cases.
(The value set in "
Cd.13
Positioning operation speed override" is validated
after a deceleration stop.)
•
During deceleration by a stop command
•
During automatic deceleration during positioning control
(3) When the speed is changed during interpolation control, the required speed
is set in the reference axis.
[3] Setting the override function
The following shows the data settings and sequence program example for setting
the override value of axis 1 to "200%".
(1) Set the following data. (Use the start time chart shown in section (2) below
as a reference, and set using the sequence program shown in section (3).)
Buffer memory address
Setting item
Setting
value
Setting details
Axis
1
Axis
2
Axis
3
Axis
4
Cd.13
Positioning
operation speed
override
200 Set the new speed as a percentage (%). 1513 1613 1713 1813
Refer to section "5.7 List of control data" for details on the setting details.
(2) The following shows a time chart for changing the speed using the override
function.
Cd. 13 Positioning operation
speed override
V
t
Dwell time
200
BUSY signal
Error detection signal
ll axis servo ON
Positioning start signal
Positioning complete signal
QD75 READY signal
Start complete signal
[Y10]
[Y1]
[X0]
[X10]
[XC]
[X14]
[X8]
PLC READY signal
[Y0]
Fig. 12.29 Time chart for changing the speed using the override function
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