1766-RM001A-EN-P MicroLogix 1400 Programmable Controllers ...

Using High-Speed Outputs 165PWMX Operating Frequency Status (OFS)Element Description Address Data Format Range Type User Program AccessOFS - PWM Operating Frequency Status PWMX:0.OFS long word(32-bit INT)0…40,000 status read onlyThe PWMX OFS (Output Frequency Status) is generated by the PWMsub-system and can be used in the control program to monitor the actualfrequency produced by the PWM sub-system.PWMX Duty Cycle (DC)Element Description Address Data Format Range Type User ProgramAccessDC - PWM Duty Cycle PWMX:0.DC word (INT) 1…1000 control read/writeThe PWMX DC (Duty Cycle) variable controls the output signal producedby the PWM sub-system. Changing this variable in the control programchanges 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)PWMX Duty Cycle Status (DCS)Element Description Address DataFormatDCS - PWM Duty Cycle Status PWMX:0.DCSRange Type User ProgramAccessword (INT) 1…1000 status read onlyThe PWMX DCS (Duty Cycle Status) provides feedback from the PWMsub-system. The Duty Cycle Status variable can be used within an inputinstruction on a rung of logic to provide PWM system status to theremaining control program.Publication 1766-RM001A-EN-P - October 2008