Horner APG XLt OCS - Manual (Page 47)

MAN0878-04-EN CH. 10
August 12, 2009 Page 47 of 100 ECN # 979
10.4.3 HSC (High Speed Counter)
When either Q1 or Q2 is configured for HSC operation, HSC1 or HSC2 totalize functions are
extended to allow respective direct output control based on a comparison of the current count and
a preset value (PV). See totalize in the HSC section above for more information.
10.4.4 Stepper Function
When Q1 is configured for Stepper, the stepper function is enabled at the Q1 output. Only one
stepper function and output is available.
Note that when Q1 is configured for stepper operation, Q2 operation is limited to direct
digital output.
The Stepper requires five parameters (%AQs) to be set for operation. These parameters may be set at
run-time but are ‘latched’ when the stepper is commanded to start.
Start Frequency (cycles per second)
This value (%AQ1) sets the frequency for the first cycle during the acceleration phase and the
frequency of the last cycle during the deceleration phase. When an acceleration or deceleration
count is specified, the Start Frequency must be greater than 0 and must not exceed the run
frequency or an error is generated.
Run Frequency (cycles per second)
This value (%AQ2) sets the frequency for the last cycle during the acceleration phase, the
consistent frequency during the run phase, and the frequency of the first cycle during the
deceleration mode. The Run Frequency must be greater than 0 and must not exceed 5000
cycles/sec. or an error is generated.
Acceleration Count
This value (%AQ3-4) sets the number of cycles to occur within the acceleration phase. The
frequency of the cycles within this mode will vary linearly between the specified Start and Run
frequency. The Accel count must not equal 1 or an error is generated. Setting this value to zero
disables this phase.
Run Count
This value (%AQ5-6) sets the number of cycles to occur within the run phase. The frequency of
the cycles within this mode is constant at the specified Run frequency. The Run count may be
any value. Setting this value to zero disables this phase.
Deceleration Count
This value (%AQ7-8) sets the number of cycles to occur within the deceleration phase. The
frequency of the cycles within this phase will vary linearly between the specified Run and Stop
frequency. The Decel count must not equal 1 or an error is generated. Setting this value to zero
disables this phase.