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Pwm output duty cycle error – Rockwell Automation 2080-LC20-20QBBR Micro820 20-point Programmable Controllers User Manual User Manual

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Rockwell Automation Publication 2080-UM005A-EN-E - December 2013

105

Specifications Appendix A

PWM Output Duty Cycle Error

Turn On/Off time for the Micro820 controllers for the PWM output port is
0.2

μs and 2.5 μs max, respectively. Duty cycle error is:

Positive error = 2.5

μs * F

Negative error = -0.2

μs * F

The plot below shows duty cycle error vs. frequency.

To get the duty cycle error at a certain frequency, for example, the user sets
frequency to 20 KHz, and sets duty cycle to 30% in Connected Components
Workbench, then actual duty cycle is

Current ratings per point

0.3 A @ 65 °C, max

1.0 A @ 30 °C, max

1.0 mA, max leakage

100 mA (high speed

operation)

1.0 A @ 30 °C

0.3 A @ 65 °C

(standard operation)

1.0 mA, max leakage

Surge current per point

peak current

max surge duration

max rate of repetition @ 30 °C

max rate of repetition @ 65 °C

4.0 A

10 ms

once each second

once every two seconds

Controller current, max total

3 A

Turn-on time, max

0.1 ms

0.2 μs

Turn-off time, max

1.0 ms

2.5 μs

Response time, max

10 ms

Frequency rate

NA

2%

(1)

High speed output operation is greater than 5 Khz.

DC Output Specifications for 2080-LC20-20QBB(R)

Attribute

Standard Outputs
(Outputs O-00…O-05)

High Speed Output

(1)

(Output O-06)

30%

+5%

-0.4%.