Mitsubishi Electric LD77MH, User Manual

Page: 195 / 238

5 - 27
Chapter 5 Synchronous Control Initial Position
5.5.2 Cam position calculation monitor data
Monitor item Storage details Monitor value
Buffer memory
address
[Md.600]
Cam position
calculation result
• The result of the cam position
calculation is stored.
Refresh cycle: At cam position
calculation completion
Monitoring is carried out in decimal.
• When calculating the cam axis feed current value:
-2147483648 to 2147483647
[Output axis position units
(Note-1)
]
• When calculating the cam axis current value per cycle:
0 to (Cam axis length per cycle - 1)
[Cam axis cycle units
(Note-2)
]
53800
53801
(Note-1): Output axis position units (Refer to Section 4.5.1)
(Note-2): Cam axis cycle units (Refer to Section 4.5.1)
[Md.600] Cam position calculation result
The result of the cam position calculation is stored.
When calculating the cam axis feed current value
.......................... Calculated value of the cam axis feed current
value is stored.
When calculating the cam axis current value per cycle
.......................... Calculated value of the cam axis current
value per cycle is stored.
The cam reference position is not updated
automatically by the cam position calculation
function.
Search for the cam axis current value per cycle
When calculating the cam axis current value per cycle using cam data, the position
corresponding to "[Cd.618] Cam position calculation: Cam axis feed current value" is
searched using cam data based on the position specified by "[Cd.617] Cam position
calculation: Cam axis current value per cycle".
The following shows the order of the search for "[Cd.618] Cam position calculation: Cam
axis feed current value".
[Stroke ratio data format]
When "the nth point of cam data

[Cd.617] Cam position calculation: Cam axis current
value per cycle < the n + 1st point of cam data", the position corresponding to "[Cd.618]
Cam position calculation: Cam axis feed current value" is searched from the nth point of
cam data.
If "[Cd.617] Cam position calculation: Cam axis current 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, the warning "Cam position calculation cam axis 1 cycle current
value calculation disable" (warning code: 834) will occur in reciprocated cam pattern.