Current Value Changing - Mitsubishi Electric MELSECQ Series User Manual

9 POSITIONING CONTROL

9.2.4 Current value changing

Setting item
Da. 1 Operation pattern
Da. 2 Control method
Da. 3 ACC/DEC time
Da. 4 DEC/STOP time
Da. 5 Command speed
Positioning address/
Da. 6
movement amount
Da. 7 Dwell time
Refer to "Section 4.5 List of positioning data" for the setting details.
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Current value changing performs control to change " Md. 1 Current feed value" to any
address.
Operation chart
The following chart shows the operation timing for a current value changing. The
" Md. 1 Current feed value" is changed to the value set in " Da. 6 Positioning
address/movement amount" when the positioning start signal turns ON.
Positioning start signal
[Y8 to YF]
Positioning complete signal
[X18 to X1F]
Md.1 Current feed value
Restrictions
(1) If "Continuous path control" is set in " Da. 1 Operation pattern", the "New
current change not possible" error (error code: 502) occurs. ("Continuous path
control" cannot be set for current value changing.)
(2) "Current value changing" cannot be set in " Da. 2 Control method" of the
positioning data when "continuous path control" has been set in " Da. 1
Operation pattern" of the immediately prior positioning data. (For example, if the
operation pattern of positioning data No. 1 is "continuous path control", "current
value changing" cannot be set in positioning data No. 2.)
If such setting has been made, the "New current change not possible" error
(error code: 502) occurs, resulting in a deceleration stop.
(3) If the value set in " Da. 6 Positioning address/movement amount" (New current
value) is outside the setting range of the software stroke limit upper and lower
limit values ( Pr. 1 , Pr. 2 ), the "Software stroke limit +, -" error (error code: 103,
104) occurs and current value changing cannot be made.
Positioning data setting examples
The following table shows the setting examples when " current value changing" is
set in the positioning data No. 1 of axis 1.
Setting example
Positioning
termination
Current value
changing
–
–
–
10000pulse
500ms
search engine
ON
OFF
ON
OFF
5000 10000
Setting details
Set "Positioning termination" assuming that the next positioning data
will be executed. ("Continuous path control" cannot be set by current
value change.)
Set the current value changing.
Setting not required (Setting value is ignored.)
Setting not required (Setting value is ignored.)
Setting not required (Setting value is ignored.)
Set the address to which address change is desired.
Set the time from completion of current value changing until the
positioning complete signal is output.
MELSEC-Q
Current feed value changes to the
positioning address designated by the
positioning data of the current value changing.
The above chart shows an example
when the positioning address is "10000".
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