Mitsubishi Electric SV13/22 Programming Manual page 221

7. POSITIONING CONTROL
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POINT
If control is started by turning M1812+20n ON, leave M1812+20n ON until
positioning control is completed.
The feed current value cannot be guaranteed if M1812+20n is turned OFF
during control.
(4) Changing travel value during speed control
After speed/position switching control is started, the travel value for position
control can be changed while speed control is in progress. Follow the
procedure described below to change the travel value.
(a) Indirectly designate the travel value in the servo program using the 2-word
data registers shown in the table below.
<A172SHCPUN>
Axis No.
1
2
3
4
5
6
7
8
<A171SHCPUN>
Axis No.
1
2
3
4
Example
The following servo program moves Axis 4 in the forward direction at speed
50000 under speed control and after the external CHANGE signal turns ON, it
executes position control for the travel value designated in registers D875 and
D876.
<K 11>
VPF
Axis
Speed
search engine
Data Register Number
for Indirect
Designation
D815
D835
D855
D875
D895
D915
D935
D955
Data Register Number
for Indirect
Designation
D815
D835
D855
D875
4, D875 Indicates indirect designation of travel value
50000
7 − 69
Data Registers to Change Travel Value
Most-Significant Data Least-Significant Data
D816
D836
D856
D876
D896
D916
D936
D956
Data Registers to Change Travel Value
Most-Significant Data Least-Significant Data
D816
D836
D856
D876
D815
D835
D855
D875
D895
D915
D935
D955
D815
D835
D855
D875