Mitsubishi A1SD75M1, User Manual

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12 - 65
MELSEC-A
12 CONTROL AUXILIARY FUNCTIONS
12.6.2 Absolute position restoration mode switching function
The "absolute position restoration mode switching function" switches the mode for
absolute position restoration in the absolute position detection system of control unit
"degree". This enables absolute position detection for infinite length positioning control
where control is performed in only the given direction, e.g. turn table.
[1] About absolute position restoration mode
[2] Control details
[3] Precautions during control
[4] Absolute position restoration mode switching method
[1] About absolute position restoration mode
There are the following two absolute position restorable ranges (absolute position
restoration modes) in an absolute position detection system of control unit "degree"
(" Pr.1 Unit setting" is "2").
(a) Standard mode
In this mode, the absolute position can be restored only within the range
where out of bound operation (operation where " Md.29 Current feed value"
changes from 359.99999° to 0° when the address increases, or " Md.29
Current feed value" changes from 0° to 359.99999° when the address
decreases) is not performed from the zero point return position.
(b) Infinite length mode
In this mode, the absolute position can be restored in the range where out of
bound operation (operation where " Md.29 Current feed value" changes
from 359.99999° to 0° when the address increases, or " Md.29 Current feed
value" changes from 0° to 359.99999° when the address decreases) is
performed from the zero point return position.
Zero point return position
359.99999 359.99999 359.99999 359.99999 359.99999
0 0 0
0
0
Zero point return position
359.99999 359.99999
359.99999
359.99999
0 0 0 0 0
359.99999
(Standard mode)
(Infinite length mode)
Usable range in absolute position
detection system
Unusable range in absolute position
detection system
Fig. 12.33 Ranges where absolute position can be restored in absolute position detection system of
control unit "degree"