Basic description of PCL series
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In another application, drawing a freestyle curve
(a sequence of short line segments) changes in
the speed are possible, as shown in Figure 3.
In order to start the next operation by eliminating the waiting time, you have to write the data to each of
pre-registers for the speed pattern settings, as well as the next operation’s start command.
The actual procedure is as follows. To operate a motor with the pattern shown in Figure 2, do the following:
a) First, write the values for operation (1) in each pre-register.
b) Write a start command. The moment the start command is written, all of the values are copied into the
appropriate operation registers and the LSI starts operation.
c) After starting operation, the values for operation (2) must be written to the LSI. However, the pre-registers
still contain the values that were written in step a) above, so you only need to overwrite those values that
are different from operation (1). (However, the feed amount [preset amount or target position] still needs to
be written again, even if the value is the same as in the previous operation, because the counter is reset to
zero when the current operation is complete.)
d) During the execution of operation (1), write the next operation start command.
e) After operation (2) has started, repeats step c) and d) for subsequent operations.
5. Rampdown point auto setting function
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For positioning operations (preset operations) with the PCD series, we have to set a rampdown point
(deceleration start point) for acceleration/deceleration operations, in order to tell the LSI the number of residual
pulses at which to start deceleration.
All models in the PCL series have a rampdown point auto setting function. Using this function, you don’t need
to write the rampdown point setting register for each operation.
There are two ways to think about using the PCL series rampdown point auto setting function.
Using pre-registers, the LSI can prepare the data for the next operation during the current
operation, so that no time is lost between operations.
- With pre-registers
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