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MELSEC-Q
12 CONTROL SUB FUNCTIONS
12.7.5 Target position change function
The "target position change function" is a function to change a target position to a
newly designated target position at any timing during the position control (1-axis linear
control). A command speed can also be changed simultaneously.
The target position and command speed changed are set directly in the buffer
memory, and the target position change is executed by "
Cd.29
Target position
change request flag".
The following shows the details of the "target position change function".
[1] Details of control
[2] Precaution during operation
[3] Method of setting target position change function from PLC CPU
[1] Details of control
The following charts show the details of control of the target position change
function.
(a) When the address after change is positioned away from the start point more than the positioning address:
Target position change request
Positioning address Address after change
(b) When the speed is changed simultaneously with changing the address:
Target position change request
Positiioning address
Address after change
Speed before
change
Speed after
change
(c) When the direction of the operation is changed:
arget position change
request
Positioning address
Address after
change
Fig. 12.41 Target position change operation
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