Horner APG XL4 OCS - Manual (Page 54)

CH.11 MAN0964-01-EN
June 29, 2012 Page 54 of 122
11.4 High Speed Output Functions
On units that support the PWM, two dedicated outputs are available that can be configured for one of four
modes of operation. Those modes are Normal, PWM, HSC Match and Stepper.
11.4.1 Normal
When either Q1 or Q2 is configured for Normal operation, the digital output registers %Q1 and
%Q2 drives that respective output.
11.4.2 PWM
When either Q1 or Q2 is configured for PWM, the PWM function drives that respective output.
Both PWM channels may be individually enabled and can have independent frequency and duty
cycles.
The PWMs require two parameters (%AQs) to be set for operation. These parameters may be set at
run-time.
• Duty Cycle
The Duty Cycle is a 32 bit value from 0 to 32,000 indicating the relative duty cycle of the output.
For example a value of 8000 would indicate a 25% duty cycle, a value of 16,000 would indicate a
50% duty cycle. 0 turns the output off, 32,000 turns the output on.
• Frequency
The Frequency is a 32 bit value indicating the output frequency in Hertz. One over the frequency
is the period.
At controller power-up or during a download, the PWM output is maintained at zero until
both the Frequency and the Duty cycle are loaded with non-zero values. When the
controller is placed in stop mode, the state of the PWM outputs is dependent on the PWM
State on Controller Stop configuration. This configuration allows for either hold-last-state
or specific frequency and duty cycle counts. Specifying zero for either the period or duty
causes the PWM output to remain low during stop mode.
Period
Duty Cycle