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Chapter 13 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 speed change time chart shown in section (2) below as a reference,
and set using the sequence program shown in section (3).)
Setting item
Setting
value
Setting details
Buffer memory address
QD77MS2
QD77MS4
QD77MS16
[Pr.42]
External command
function selection
1 Set "1: External speed change request". 62+150n
[Cd.8]
External command
valid
1 Set "1: Validate the external command". 1505+100n 4305+100n
[Cd.14] New speed value 1000000 Set the new speed.
1514+100n
1515+100n
4314+100n
4315+100n
n: Axis No.-1
: Set the external command signal (D1) in "[Pr.95] External command signal selection" at QD77MS16 use.
Refer to Section 5.2 "List of parameters" and Section 5.7 "List of control data" for details on the setting details.
(2) The following shows the speed change time chart.
[QD77MS4 operation example]
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
1
0
Cd. 8 External command valid
Dwell time
BUSY signal
Error detection signal
PLC READY signal
Positioning start signal
Positioning complete signal
READY signal
Start complete signal
[Y10]
[XC]
[X0]
[Y0]
[X10]
[X8]
[X14]
External command signal
All axis servo ON
[Y1]
(Note): Refer to Section 3.3 for input/output signal of QD77MS16.
Fig. 13.27 Time chart for changing the speed using an external command signal