High Speed Output Functions - HORNER APG EXL10 OCS User Manual

9.5

High Speed Output Functions

On units that support High Speed Output functions, 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.
9.5.1 Normal
When either Q1 or Q2 is configured for Normal operation, the digital output registers %Q1 and %Q2
drives that respective output.
9.5.2 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. The value zero (0) turns the output off, and 32,000 turns the output on.
Duty Cycle
Frequency - The Frequency is a 32-bit value indicating the output frequency in Hertz. One over the
frequency is the period.
Period
Figure 9.6 & Figure 9.7 – PWM, two parameters, Duty Cycle & Frequency
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.
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