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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.
(4) When deceleration is started by the override function, the deceleration start
flag does not turn ON.
(5) When carrying out continuously override, be sure there is an interval
between the override execution of 100ms or more.
(If the interval between override is short, the QD75MH will not be able to
track, and it may become impossible to carry out commands correctly.)
[3] Setting the override function
The following shows the data settings and PLC 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 PLC 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.