900
High-speed Counter/Pulse Output Instructions Section 3-21
â– Independent Mode Positioning
When independent mode operation is started, pulse output will be continued
until the specified number of pulses has been output.
The deceleration point is calculated from the number of output pulses and
deceleration rate set in S and when that point is reached, the frequency is
decreased every pulse control period (4 ms) at the deceleration rate specified
in S until the specified number of points has been output, at which point pulse
output is stopped.
Note 1. Pulse output will stop immediately if the CPU Unit is changed to PRO-
GRAM mode.
2. The number of output pulses must be set each time output is restarted.
3. The number of output pulses must be set in advance with PULS(881).
Pulses will not be output for ACC(888) if PULS(881) is not executed first.
4. The direction set in the ACC(888) operand will be ignored if the number of
pulses is set with PULS(881) as an absolute value.
Stopping
pulse output
To stop
pulse out-
put
Immediate stop Immediately stops
pulse output.
ACC(888)
(Continu-
ous)
↓
INI(880)
(Continu-
ous)
To stop
pulse out-
put
Immediate stop Immediately stops
pulse output.
ACC(888)
(Continu-
ous)
↓
SPED(885)
(Continu-
ous, target
frequency of
0)
To stop
pulse out-
put
smoothly
Decelerating to a
stop
Decelerated pulse
output to a stop.
Note If the target
frequency of
the second
ACC(888)
instruction is
0Hz, the
deceleration
rate from the
first
ACC(888)
instruction
will be used.
ACC(888)
(Continu-
ous)
↓
ACC(888)
(Continu-
ous, target
frequency of
0)
Operation Purpose Application Frequency changes Description Procedure/
instruction
Pulse frequency
Present frequency
Execution of ACC(888)
Execution of INI(880)
Time
Pulse frequency
Present frequency
Execution of ACC(888) Execution of SPED(885)
Time
Pulse frequency
Present frequency
Execution of ACC(888)
Execution of ACC(888)
Time
Acceleration/deceleration rate
(value set when starting)
Target frequency = 0
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