LSIS XBC-DN20S, Руководство пользователя, Страница: 45 / 315

Chapter 3 Before positioning
3- 8
• If step no. 1 in table 3-4 starts, object moves forward by speed control because Control is SPD
and Address is positive number.
• If speed/position switching command (VTP instruction) is executed during speed control, current
position will be initialized as 0 and object moves by position control until 1000.
• If object reaches target position, complete flag and M code occurrence flag will be on after dwell
time. At this time, M code number 11 is displayed as set in operation data.
• Positioning complete flag will be on during one scan and M code occurrence flag keeps on
status, until it is turned off by off command.
Remark
• M code occurrence flag is turned off by MOF instruction.
• Using MOF instruction, M code occurrence flag and M code number will be clear
simultaneously.
• Speed/position switching command is executed only when each axis is operating.
If it is executed during stop, it may cause error.
• If position/speed switching command is executed during operation by speed control, the
command is ignored. But at this time, error is not occurred.
3.1.5 Position/speed switching control
• It change position control to speed control by switching command (VTP instruction).
• In case of position/speed switching control, items affecting the operation are different according to
control method. In case position control, all items affect the operation but in case of speed, some
items affect the operation as shown below.
- First, object moves by position control. If position/speed switching control is executed, object will
move by speed control. At this time, the current position is not initialized. Only control method
changes into speed control and it continues operation
- When control method changes, some items in operation data doesn’t affect the operation.
(1) Example
•
It assumes that operation data is specified as shown table 3-5.
Step
no.
Coord
.
Pattern
Contr
ol
Metho
d
Rep
step
Address
[Pulse]
M
Code
A/D
No.
Speed
[pls/s]
Dwell [
㎳
]
1 INC END POS SIN 0 10000 12 1 500 100
< Table 3-5 operation data example of position/speed switching control >
• If step no. 1 in table 3-5 starts, object moves by position control according to operation data in
table 3-5 because Control is POS.
• If position/speed switching command (VTP instruction) is executed during position control,
object moves by speed control until stop command.
• If object stops by stop command, it will stop without dwell time and positioning complete flag will
not be on.
These items don’t affect the operation in case of position/speed switching