Automate Frequency Output - Curtis 1232E Manual

Curtis 1232E/34E/36E/38E & 1232SE/34SE/36SE Manual,
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AUTOMATE_FREQUENCY_OUTPUT()
This function sets up the PD Driver (pin 2) PWM output to yield a frequency
proportional to the input variable at an execution rate of 16 ms. This output can be
used to drive an electronic speedometer or tachometer.
An additional VCL variable called Frequency_Output_Duty_Cycle works in
conjunction with the Automate_Frequency_Output() function to modify the duty
cycle of the output. The default value of Frequency_Output_Duty_Cycle is 50% (or
16384).
Syntax Automate_Frequency_Output()
Parameters
Index of source value to be the input.
@Source
Holds the minimum value for the input.
MinInput
Holds the maximum value for the input.
MaxInput
Holds the minimum value for the output in Hz.
MinOutput
Holds the maximum value for the output in Hz.
MaxOutput
Note: The frequency range is 0–4000 Hz, with 4 Hz being
the minimum active frequency, and 0–3 Hz = Off.
Returns
0 – PWM not automated.
1 – PWM automated.
Error Codes
Param_Range is returned when a parameter is out of range.
PT_Range is returned when the Parameter Table Index is out of range.
Example
To set up the PD Driver to output 500–1500 Hz (at duty cycle = 25%) for motor
speed in the range 100–4000 rpm:
Frequency_Output_Duty_Cycle = 8192
Automate_Frequency_Output(@ABS_Motor_Speed,100,4000,500,1500)
os
;set duty cycle = 25%
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8 — VCL
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