288
Pulse Outputs Section 5-3
Procedure
Restrictions on the PWM(891) Outputs
• In the Y CPU Units, PWM outputs 0 and 1 cannot be used for pulse out-
puts 2 and 3 if the origin search function is enabled for pulse outputs 2
and 3.
Specifications
Note The frequency can be set up to 6553.5 Hz in the PWM(891) instruction, but
the duty factor accuracy declines significantly at high frequencies because of
limitations in the output circuit at high frequencies.
5-3-10 Example Pulse Output Applications
Outputting Pulses after a Preset Delay
This example program waits for a preset time (0.5 ms) after the interrupt input
(CIO 0.00) goes ON and then outputs 100,000 pulses at 100 kHz from pulse
output 0.
Input interrupt task 0 (interrupt task number 140) starts a scheduled interrupt
with a scheduled time of 0.5 ms. The scheduled interrupt task executes the
pulse output instructions and stops the scheduled interrupt.
• PWM output 0 or PWM output 1
• Disable the origin search function for pulse
outputs 2 and 3.
Note: Disable the origin search function because the PWM output
shares the output with the origin search function's Error
Counter Reset Output and both cannot be used
simultaneously.
Execute PWM(891).
Determine the pulse output port.
Wire the outputs.
PLC Setup settings
(Y models only)
Ladder program
Item Specifications
Duty factor 0.0% to 100.0% in 0.1% increments
(Duty factor accuracy is ±5% at 1 kHz.)
Frequency 0.1 Hz to 6,553.5 Hz
Set in 0.1 Hz units. (See note.)
Output mode Continuous mode
Instruction PWM(891)
MSKS
PULS SPED
Pulse output 0
(CIO 100.00)
Interrupt input 0
(CIO 0.00)
I/O interrupt
response time
Scheduled interrupt
time 500 µs
To Next Page
Loading...
Need help?
General
