Mitsubishi Electric MELSEC iQ-R RD78G4 User Manual page 152

• Search from a value in the middle of the cam axis position value per cycle. (Cam data starting point  0)
Cam axis position value per cycle
Cam axis command position value
(Command position value)
New cam reference position
current value
Cam reference position
at the start of restoration
• The first search fails and a search begins for the second time.
Cam axis position value per cycle
Cam axis command position value
(Command position value)
New cam reference position
current value
Cam reference position
at the start of restoration
If the first search fails, a second search may not be processed on the next cycle for a cam pattern with a feed
stroke that is smaller than 100% of the stroke as above.
The intended cam axis position value per cycle can be found in the first search, by setting or positioning the
cam reference position in advance.
5 ADVANCED SYNCHRONOUS CONTROL INITIAL POSITION
150
5.3 Cam Axis Position Restoration Method
[Pr.468] Cam axis position value per cycle (Initial setting)
Cam data
Update the cam reference
starting point
position in the next cycle
automatically. (Update the
cam data at the 0th point.)
Once the first search fails, the new cam reference position is automatically
updated so that "Command position value - New cam reference position" is
within the feed stroke amount, and the search process starts again.
Search from the value in the middle.
Search from the value in the middle and restore
to the first command position value that matches.
Feed stroke
Restored to the first
command position value
that is found in the second search.