Mitsubishi MELSEC-Q QD77MS, User Manual

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Chapter 9 Major Positioning Control
9.2.19 Current value changing
When the current value is changed to a new value, control is carried out in which the
"
Md.20
Current feed value" of the stopped axis is changed to a random address set
by the user. (The " Md.21 Machine feed value" is not changed when the current value
is changed.)
The two methods for changing the current value are shown below.
[1] Changing to a new current value using the positioning data
[2] Changing to a new current value using the start No. (No. 9003) for a current
value changing
The current value changing using method [1] is used during continuous positioning of
multiple blocks, etc.
[1] Changing to a new current value using the positioning data
Operation chart
The following chart shows the operation timing for a current value changing. The
"
Md.20
Current feed value" is changed to the value set in "
Da.6
Positioning
address/movement amount" when the positioning start signal turns ON.
[QD77MS4 operation example]
Positioning start signal
[Y10,Y11,Y12,Y13]
Md.20
50000 0
OFF
ON
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 "0".
Current feed value
(Note): Refer to Section 3.3 for input/output signal of QD77MS16.
Restrictions
(1) An axis error "New current value not possible (error code: 515)" will occur and
the operation cannot start if "continuous path control" is set in
"
Da.1 Operation pattern". ("Continuous path control" cannot be set in current
value changing.)
(2) "Current value changing" cannot be set in " Da.2 Control system" 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.) An
axis error "New current value invalid (error code: 515)" will occur and the
machine will carry out a deceleration stop if this type of setting is carried out.