Mitsubishi Electric MELSEC iQ-R RD78G4 User Manual page 164

■Stroke ratio data format
When "the nth point of cam data  [Cd.617] Cam position calculation: Cam axis position value per cycle < the n + 1st point of
cam data", the position corresponding to "[Cd.618] Cam position calculation: Cam axis command position value" is searched
from the nth point of cam data.
If "[Cd.617] Cam position calculation: Cam axis position value per cycle" is in the middle of the cam data and the
corresponding position is not found until the last point of the cam data, return to the 0th point and search until the search
starting point.
If the corresponding position is not found even though the whole area of the cam data has been searched, "Cam position
calculation cam axis 1 cycle position value calculation disable" (warning code: 0EB4H) will occur in reciprocating cam pattern.
For the feed cam, calculate "[Cd.618] Cam position calculation: Cam axis command position value" by the stroke difference
and search the whole range from the 0th point again. If the corresponding position is not found even though the search
process starts again, "Cam position calculation cam axis 1 cycle position value calculation disable" (warning code: 0EB4H)
will occur.
Ex.
When "[Cd.617] Cam position calculation: Cam axis position value per cycle" is corresponding to the 0th point of cam data
0
(Cam reference
position)
At the 0th point
• Searches until between the 255th point and the 256th point (last point) in order of the cam data between the 0th point and
the 1st point and between the 1st point and the 2nd point.
Ex.
When "[Cd.617] Cam position calculation: Cam axis position value per cycle" is corresponding to the 128th point of cam data
0
(Cam reference
position)
At the 0th point
• Searches until between the 255th point and the 256th point (last point) in order of the cam data between the 128th point
and the 129th point and between the 130th point and the 131st point.
• If the corresponding position is not found until the last point of the cam data, searches from the 0th point of the cam data.
• Searches until between the 127th point and the 128th point in order of the cam data between the 0th point and the 1st point
and between the 1st point and the 2nd point.
5 ADVANCED SYNCHRONOUS CONTROL INITIAL POSITION
162
5.5 Cam Position Calculation Function
[Cd.617] Cam position calculation:
Cam axis position value per cycle
Search starting point
Cam axis length per cycle [Cam axis cycle units]
2
Cam axis length per cycle [Cam axis cycle units]
1
1
[Cd.617] Cam position calculation:
Cam axis position value
per cycle
Search starting point
At the 128th point
Search order
At the 256th point
Search order
At the 256th point