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13 PWM Outputs
13-1 PWM Outputs (Variable-duty-factor
Pulse Outputs)
PWM outputs can be used only with the CP1E N/NA-type CPU Unit with transistor outputs.
A PWM (Pulse Width Modulation) pulse can be output with a specified duty factor. The duty factor is the
ratio of the pulse's ON time and OFF time in one pulse cycle. Use the PWM instruction to generate
PWM pulses from a built-in output. The duty factor can be changed during pulse output.
Application example
• Controlling temperature on a time-proportional basis using the PWM output.
• Controlling the brightness of lighting.
15%
Duty factor:15%
50%
Duty factor:50%
Duty factor:75%
Specifications
Item
Duty factor
Frequency
Output mode
Instruction
* The duty factor accuracy declines significantly at high frequencies because of limitations in the output circuit at
high frequencies.
Additional Information
For N30/40/60 or NA20 CPU Units, the output indicator of terminal 01 on terminal block CIO100
is always lit during PWM output.
13-2
Built-in output
PWM output
100%
Period is determined
by frequency
75%
0.0% to 100.0% in 0.1% increments
(Duty factor accuracy is +1%/-0% at 10 kHz, +5%/-0% at 10 to 32 kHz .)
2.0 Hz to 6,553.5 Hz (Set in 0.1-Hz increments.)*
2 Hz to 32,000 Hz (Set in 1-Hz increments.)*
Continuous mode
PWM
Specification
CP1E CPU Unit Software User's Manual(W480)
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