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9
MAIN POSITIONING CONTROL
9.1.5 Control unit "degree" handling
When the control unit is set to "degree", the following items differ from when other
control units are set.
(1)
Current feed value and machine feed value addresses
When the control unit is set to "degree", "Current feed value (RWrn + 0 to 1,
Rwrn + 8 to 9)" becomes the ring address of 0 to 359.99999 °
" Md.30 Machine feed value" does not become the ring address of 0 to 99999 ° .
Current feed value
(RWrn+0 to 1, Rwrn+8 to 9)
Md.30 Machine feed value
(2)
Positioning control method when the control unit is set to "degree"
(a)
Absolute system
1)
When the software stroke limit is invalid
Positioning is carried out in the nearest direction to the designated
address, using the current value as a reference.
(This is called "shortcut control".)
Example
1) Positioning is carried out in a clockwise direction when the current value is moved from 315° to 45°.
2) Positioning is carried out in a counterclockwise direction when the current value is moved from 45° to 315°.
Moved from 315° to 45°
315°
POINT
To make the software stroke limit invalid, set to
[Software stroke limit upper limit value = Software stroke limit lower limit value].
(Set a value within the range of 0 ° to 359.99999 ° .)
45°
9 - 17
MELSEC-A
Moved from 45° to 315°
315°
45°
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