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MELSEC-Q
12 CONTROL SUB FUNCTIONS
[4] Setting the speed change function using an external command
signal
The speed can also be changed using an "external command signal".
The following shows the data settings and sequence program example for
changing the control speed of axis 1 using an "external command signal". (In this
example, the control speed is changed to "10000.00mm/min".)
(1) Set the following data to change the speed using an external command
signal.
(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
Pr.42
External command
function selection
1 Set "1: External speed change request". 62 212 362 512
Cd.8
External command
valid
1 Set "1: Validate the external command". 1505 1605 1705 1805
Cd.14
New speed value 1000000 Set the new speed.
1514
1515
1614
1615
1714
1715
1814
1815
Refer to Section 5.7 "List of control data" for details on the setting details.
(2) The following shows the speed change time chart.
Pr. 42 External command function selection
V
t
0
1
0
1
Md.40 In speed change processing flag
Cd. 14 New speed value
1000000
0
1
0
Cd. 8 External command valid
Dwell time
BUSY signal
Error detection signal
PLC READY signal
Positionin
g
start si
g
nal
Positioning complete signal
QD75 READY signal
Start complete signal
[Y10]
[XC]
[X0]
[Y0]
[X10]
[X8]
[X14]
External command signal
Fig. 12.27 Time chart for changing the speed using an external command signal