Cam Position Calculation Function - Mitsubishi Electric MELSEC iQ-R Series Programming Manual

7.5

Cam Position Calculation Function

The cam position is calculated by the CAMPSCL instruction (Cam position calculation) of Motion SFC program with this
function. This function can be used to calculate the cam position for the synchronous control initial position before starting
synchronous control.
Refer to the following for details of CAMPSCL instruction.
MELSEC iQ-R Motion controller Programming Manual (Program Design)
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 current feed value and the cam reference
position of axis 1.
2.
Calculate the cam axis current feed value of axis 2 with this function based on the cam axis current value per cycle that
was calculated in Step 1.
3.
Calculate the cam axis current feed value of axis 3 with this function based on the cam axis current value per cycle that
was calculated in Step 1.
4.
Execute positioning on axis 2 to bring the cam to the cam axis current feed value which was calculated in Step 2, and
also on axis 3 to the cam axis current feed value which was calculated in Step 3.
5.
Start synchronous control on axis 1, 2 and 3 with the current feed value restoration mode. Use the cam axis current value
per cycle that was calculated in Step 1 for the cam axis current value per cycle (Initial setting).
7 SYNCHRONOUS CONTROL INITIAL POSITION
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7.5 Cam Position Calculation Function