Allen-Bradley MicroLogix 1200 Reference Manual page 122

6-24 Using High-Speed Outputs
Publication 1762-RM001C-EN-P
PWM Output Frequency (OF)
Element Description
OF - PWM Output Frequency PWM:0.OF word (INT) 0 to 20,000
The PWM OF (Output Frequency) variable defines the frequency of the
PWM function. This frequency can be changed at any time.
PWM Operating Frequency Status (OFS)
Element Description Address
OFS - PWM Operating PWM:0.OFS
Frequency Status
The PWM OFS (Output Frequency Status) is generated by the PWM
sub-system and can be used in the control program to monitor the actual
frequency produced by the PWM sub-system.
PWM Duty Cycle (DC)
Element Description Address
DC - PWM Duty Cycle PWM:0.DC
The PWM DC (Duty Cycle) variable controls the output signal produced
by the PWM sub-system. Changing this variable in the control program
changes the output waveform. Typical values and output waveform:
• DC = 1000: 100% Output ON (constant, no waveform)
• DC = 750: 75% Output ON, 25% output OFF
• DC = 500: 50% Output ON, 50% output OFF
• DC = 250: 25% Output ON, 75% output OFF
• DC = 0: 0% Output OFF (constant, no waveform)
PWM Duty Cycle Status (DCS)
Element Description
DCS - PWM Duty Cycle Status PWM:0.DCS word (INT) 1 to 1000 status read only
The PWM DCS (Duty Cycle Status) provides feedback from the PWM
sub-system. The Duty Cycle Status variable can be used within an input
instruction on a rung of logic to provide PWM system status to the
remaining control program.
Address Data Range
Format
Data Range
Format
word (INT) 0 to 20,000
Data Format Range
word (INT) 1 to 1000
Address Data Range
Format
Type User Program
Access
control read/write
Type User Program
Access
status read only
Type User Program
Access
control read/write
Type User Program
Access