Delta DVP-ES2 - Manual (Page 557)

3 . I n s t r u c t i o n S e t
3 - 4 4 1
Frequency
Time
Pulse Number
High speed counter receives
target number of feedbacks
or
External interrupt occurs
Target
frequency
Start/end
frequency
Ramp-up
tim e
High speed time Ramp-down
time Idle time
Number of output pulses =
target number of feedbacks x D1131(D1132) / 100
3. Principles for adjusting the completion time of positioning:
a) The completion time of positioning refers to the total time of “ramp up + high speed +
ramp down + idle” (see the figure above). When percentage value (D1131/D1132) is
modified, the total number of output pulses will be increased or decreased as well as the
completion time.
b) When S
1
designates input points X with interrupt pointers, D1244 / D1255 can be
applied for setting the idle time as limited pulse number, in case the interrupt is not
properly triggered.Users can determine if the execution result is good or bad by the
length of the idling time. In theory, a bit of idling left is the best result for a positioning.
c) Owing to the close loop operation, the length of idle time will not be the same in every
execution. Therefore, when the content in the special D for displaying the actial number
of output pulses is smaller or larger than the calculated number of output pulses (target
number of feedbacks x percentage value / 100), users can improve the situation by
adjusting the percentage value, ramp-up/ramp-down time or target frequency.
Program Example1: Immediate stop high-speed pulse output by external interrupt
1. Adopt X4 as the input for external interrupt and I401 (rising-edge trigger) as the interrupt
pointer. Set target number of feedbacks = 50,000; target frequency = 100kHz; pulse output
device: Y0, Y1 (CH0); start/end frequency (D1340) = 100Hz; ramp-up time (D1343) = 100ms;
ramp-down time (D1348) = 100ms; percentage value (D1131) = 100; present value of output
pulses (D1030, D1031) = 0.