Allen-Bradley Micro830 Manual page 249

Rockwell Automation Publication 2080-UM002K-EN-E - March 2019
PTO Output Duty Cycle Error
Turn On/Off time for the Micro830, Micro850, and Micro870 controllers for
the PTO 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 software, then actual duty cycle is
+5%
30%
-0.4%.
0.25
0.2
0.15
0.1
0.05
0
-0.05
1000
PTO Typical Readings
PTO Typical Readings
Frequency (kHz) %Duty Cycle
5 5%
5 10%
5 20%
5 40%
5 55%
100000
10000
Frequency
Expected Duty Cycle
Minimum Maximum
4.90% 6.25%
9.90% 11.25%
19.90% 21.25%
39.90% 41.25%
54.90% 56.25%
Specifications Appendix A
Positive Error
Negative Error
Typical Duty Cycle
(1.27 KΩ load)
%Duty Cycle
5.48
10.5
20.5
40.5
55.5
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