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5.5
Cam Position Calculation Function
The cam position is calculated by the program with this function. This function can be used to calculate the cam position for
the synchronous control initial position before starting synchronous control.
Example
The following shows the procedure for synchronous position alignment, in a synchronous system where cam axes 2 and 3 are
synchronized with the cam axis current value per cycle of axis 1.
1.
Calculate the cam axis current value per cycle using this function based on the feed current value and the cam reference
position of axis 1.
2.
Calculate the cam axis feed current value of axis 2 with this function based on the cam axis current value per cycle that
was calculated in 1).
3.
Calculate the cam axis feed current value of axis 3 with this function based on the cam axis current value per cycle that
was calculated in 1).
4.
Execute positioning on axis 2 to the cam axis feed current value which was calculated in 2), and also on axis 3 to the
cam axis feed current value which was calculated in 3).
5.
Start synchronous control on axis 1, 2 and 3 with the feed current value restoration mode. Use the cam axis current value
per cycle that was calculated in 1) for the cam axis current value per cycle (Initial setting).
Cam position calculation control data
Setting item
Setting details
[Cd.612]
Cam position
calculation request
Fetch cycle: Main cycle
[Cd.613]
Cam position
Fetch cycle: At requesting cam position calculation
calculation: Cam No.
[Cd.614]
Cam position
calculation: Stroke
Fetch cycle: At requesting cam position calculation
amount
[Cd.615]
Cam position
calculation: Cam axis
Fetch cycle: At requesting cam position calculation
length per cycle
[Cd.616]
Cam position
calculation: Cam
Fetch cycle: At requesting cam position calculation
reference position
[Cd.617]
Cam position
calculation: Cam axis
Fetch cycle: At requesting cam position calculation
current value per
cycle
[Cd.618]
Cam position
calculation: Cam axis
feed current value
Fetch cycle: At requesting cam position calculation
*1 With the exception of positioning control, main cycle processing is executed during the next available time. It changes by status of axis
start.
*2 Output axis position units (Page 91 Units for the output axis)
*3 Cam axis cycle units (Page 91 Units for the output axis)
5 SYNCHRONOUS CONTROL INITIAL POSITION
120
5.5 Cam Position Calculation Function
• Set the cam position calculation request.
• The Simple Motion module resets the value to "0"
automatically after completion of the cam position
calculation.
*1
• Set the cam No. for the cam position calculation.
• Set the cam stroke amount for the cam position
calculation.
• Set the cam axis length per cycle for the cam
position calculation.
• Set the cam reference position for the cam position
calculation.
• Set the cam axis current value per cycle for the cam
position calculation.
• Set the cam axis feed current value for the cam
position calculation. (Set when calculating the cam
axis current value per cycle.)
Setting value
■Set in decimal.
1: Cam axis feed current value
calculation request
2: Cam axis current value per cycle
calculation request
■Set in decimal.
0 to 256
■Set in decimal.
-2147483648 to 2147483647
*2
[Output axis position units
]
■Set in decimal.
1 to 2147483647
*3
[Cam axis cycle units
]
■Set in decimal.
-2147483648 to 2147483647
*2
[Output axis position units
]
■Set in decimal.
0 to (Cam axis length per cycle)
*3
[Cam axis cycle units
]
■Set in decimal.
-2147483648 to 2147483647
*2
[Output axis position units
]
Default value
Buffer
memory
address
0
53780
0
53781
0
53782
53783
0
53784
53785
0
53786
53787
0
53788
53789
0
53790
53791
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