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Pulse Outputs Section 7-6
Circular Mode
Operation
A speed control pattern can be repeated in continuous speed control to con-
trol a series of repetitive operations at specific positions. For example, the fol-
lowing diagram shows an axis that repeatedly switches to low-speed
operation at one position and switches to high-speed operation at another
position. Since the speed control pattern must repeat in these applications, a
counter cannot be used if it is reversible.
7-6-10 Range Comparison Bit Pattern Outputs from Pulse Output PVs
Bit patterns can be output internally in the Auxiliary Area when the pulse out-
put PV is within a specified range.
The processing of the range-comparison bit pattern outputs for pulse output
PVs is the same as the processing for high-speed counter PVs, so refer to
Checking for High-speed Counter Interrupts under High-speed Counter Func-
tion Description in 7-5-8 Pulse Input Function Description for details.
7-6-11 Acceleration/Deceleration Rates in ACC(888) and PLS2(887)
Instructions
The acceleration/deceleration rate’s speed-change cycle can be set to either
1 ms or 2 ms for the ACC(888) and PLS2(887) instructions. The same
speed-change cycle setting applies to both pulse output 1 and 2 and both the
ACC(888) and PLS2(887) instructions.
0
High-speed
region
Low-speed
region
Single-rotation speed control pattern
Pulse output PV
Speed
(frequency)
Target value 1
Target value 2
Time
Time
High-speed
region
Low-speed
region
Controlled by
ACC instruction.