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

164 Using High-Speed OutputsPWMX Enable Hard Stop (EH)Element Description Address DataFormatRange Type User ProgramAccessEH - PWM Enable Hard Stop PWMX:0/EH bit 0 or 1 control read/writeThe PWMX EH (Enable Hard Stop) bit stops the PWM sub-systemimmediately. A PWM hard stop generates a PWM sub-system error.• Set (1) - Instructs the PWM sub-system to stop its output modulationimmediately (output off = 0).• Cleared (0) - Normal operation.PWMX Enable Status (ES)Element Description Address Data Format Range Type User ProgramAccessES - PWM Enable Status PWMX:0/ES bit 0 or 1 status read onlyThe PWMX ES (Enable Status) is controlled by the PWM sub-system.When the rung preceding the PWM instruction is solved true, the PWMinstruction is enabled, and the enable status bit is set. When the rungpreceding the PWM instruction transitions to a false state, the enablestatus bit is reset (0) immediately.• Set (1) - PWM is enabled.• Cleared (0) - PWM has completed or the rung preceding the PWM isfalse.PWMX Output Frequency (OF)Element Description Address Data Format Range Type User Program AccessOF - PWM Output Frequency PWMX:0.OF long word 0…40,000 control read/write(32-bit INT)The PWMX OF (Output Frequency) variable defines the frequency of thePWM function. This frequency can be changed at any time. In theMicroLogix 1400 controller, the data less than zero or greater than 40,000generates a PWM error.Publication 1766-RM001A-EN-P - October 2008