Mitsubishi Electric Q172CPU Programming Manual page 56

4 POSITIONING DEDICATED SIGNALS
(b) M3214+20n : OFF
(Final servo command value in previous virtual mode operation )
(Current servo current value) (In-position) ............................1)
• For formura 1)
Operation will be continued by making the lower stroke limit value and
current value within 1 cam sfaft revolution into the lower stroke limit
value and current value within 1 cam sfaft revolution at the previous
virtual mode operation.
(Final servo command value in previous virtual mode operation )
(Current servo current value) > (In-position) ............................2)
• For formura 2)
Current value within 1 cam sfaft revolution for current feed current value
is calculated and operation will be continued by making the lower stroke
limit value into the lower stroke limit value at the previous virtual mode
operation.
[Calculation of current value within 1 cam shaft revolution]
(Feed current value) = (Stroke amount)
The stroke ratio(y) used as above formula is calculated, the cam table of
the setting cam No. is searched from the beginning of a cycle, and the
current value within 1 cam shaft revolution for applicable point is
calculated.
Because the current value within 1 cam shaft revolution is serched always
from the beginning of a cycle, beware of cases where the same stroke
ratio appears more than once in the cycle.
(Make the necessary position adjustment at the switching from the real to
virtual mode.)
Stroke amount
Lower stroke limit
(Stroke ratio)
32767
y
Stroke
ratio
A
1 cycle (1 cam shaft revolution)
4 - 25
(Lower stroke limit value)
In the figure at left, there are 2 relevant
points (A and B) for the calculated stroke
ratio "y", but only point "A" is recognized.
B Number of pulses within
1 cam shaft revolution-1