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MELSEC-Q
12 CONTROL SUB FUNCTIONS
[2] Precaution during control
(1) When changing the speed during continuous path c ontrol, the speed change
will be ignored if there is not enough distanc e remaining to carry out the
change.
(2) A warning "Deceleration/stop speed change (warn ing code: 500)" occurs
and the speed cannot be changed in the foll owing cases.
(The value set in " Cd.13 Positioning operatio n speed override" is validated
after a deceleration stop.)
During deceleration by a stop command
During automatic deceleration during positioning con t rol
(3) When the speed is changed during interpolat ion control, the required speed
is set in the reference axis.
(4) When deceleration is started by the override f unction, the deceleration start
flag does not turn ON.
[3] Setting the override function
The following shows the data settings and seque nce program example for setting
the override value of axis 1 to "200%".
(1) Set the following data. (Use the start time chart show n i n secti on (2 ) below
as a reference, and set using the sequence progr am shown in section (3).)
Buffer memory address
Setting item Setting
value Setting details Axis
1Axis
2Axis
3Axis
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
PLC READY signal
Positioning start signal
Positioning complete signal
QD75 READY signal
Start complete signal
[Y10]
[Y0]
[X0]
[X10]
[XC]
[X14]
[X8]
Fig. 12.29 Time chart for changing the speed usi ng the override function