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MELSEC-
A
12 CONTROL AUXILIARY FUNCTIONS
(c) When the speed is changed by setting "New speed value (RWwm+4 to 5,
RWwm+12 to 13)" to "0", the operation is carried out as follows.
A deceleration stop is carried out, and the speed change 0 flag (RX(n+2)2,
RX(n+5)2) turns ON.
(During interpolation control, the speed change 0 flag on the reference axis
side turns ON.)
The axis stops, but "Axis operation status (RWrn+7, RWrn+15)" does not
change, and the BUSY signal remains ON. (If a stop signal is input, the
BUSY signal will turn OFF, and "Axis operation status (RWrn+7,
RWrn+15)" will change to "stopped".)
* In this case, setting the "New speed value (RWwm+4 to 5, RWwm+12 to
13)" to a value besides "0" will turn OFF the speed change 0 flag
(RX(n+2)2, RX(n+5)2), and enable continued operation.
Positioning start signal
BUSY signal
New speed value
Speed change request
Positioning operation
1000
0
ON
OFF
ON
OFF
ON
OFF
ON
OFF
Speed change 0 flag
[RY(n+1)0, RY(n+1)1]
[RXn4, RXn5]
[RWwm+4 to 5, RWwm+12 to 13]
[RY(n+2)7, RY(n+4)7]
[RX
(
n+2
)
2, RY
(
n+5
)
2]
Fig. 12.24 Speed change at new speed value "0"
(d) A warning "deceleration and stop speed change" (warning code: 500)
occurs and the speed cannot be changed in the following cases.
During deceleration by a stop command
During automatic deceleration during positioning control
(e) A warning "speed limit value over" (warning code: 501) occurs and the
speed is controlled at the "
Pr.7 Speed limit value" when the value set in
"New speed value (RWwm+4 to 5, RWwm+12 to 13)" is equal to or larger
than the "
Pr.7 Speed limit value".
(f) When the speed is changed during interpolation control, the required speed
is set in the reference axis.
(g) When carrying out consecutive speed changes, be sure there is an interval
between the speed changes of 100ms or more.
(If the interval between speed changes is short, the D75P2 will not be able
to track, and it may become impossible to carry out commands correctly.)
(h) When a speed change is requested by multiple axes simultaneously, it is
made in order of smaller to larger axis numbers.
(i) Speed change 0 cannot be performed at the time of a machine zero point
return.
The speed change request is ignored.