Publication 1763-RM001C-EN-P - October 2009
Using High-Speed Outputs 157
PWM Operating Frequency Status (OFS)
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)
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)
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.
Element Description Address Data Format Range Type User Program Access Controller
Series
OFS - PWM Operating Frequency Status PWM:0.OFS word (INT) 0 to 20,000 status read only A
word (UINT) 0 to 40,000 B
Element Description Address Data Format Range Type User Program
Access
DC - PWM Duty Cycle PWM:0.DC word (INT) 1 to 1000 control read/write
Element Description Address Data
Format
Range Type User Program
Access
DCS - PWM Duty Cycle Status PWM:0.DCS word (INT) 1 to 1000 status read only
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