PWM” operation mode
Function and settings
- This mode allows the duty cycle to be changed quickly in a real-time context (A).
- In this mode, the period value can only be changed acyclically via the CoE (D).
- The following additional settings are possible:
Fig.137: EL2502-0010 - CoE and process data for Predefined PDO "PWM"- 0x70n0:11 "PWM output":
The percentage duty cycle (Duty cycle: TON / T) is specified in "PWM output" [0 ... 100 %] to change the pulse-pause ratio. The pulse-pause TOFF is calculated automatically as the difference to the 100 % pulse value.
Desired pulse-pause ratio(Duty cycle) | Value range in hex | Value range in dec |
|---|---|---|
100 % | 7FFF | 32767 |
50 % | 3FFF | 16383 |
0 % | 0 | 0 |
- 0x80n0:07 "Operation mode", 0x80n0:15 "Period PWM"
- The operation range "PWM 20Hz...20kHz" is available via object 0x80n0:07 "Operation mode".
Notice The specification in the drop-down menu differs from the actual valid value range. The valid value range is approx. 20 Hz ... 500 kHz. - Object 0x80n0:15 "Period PWM" is used to specify the PWM period in µs.
- The number of steps changes depending on the set frequency. The resolution decreases with decreasing period value or increasing PWM frequency. The resolution or step size can be read in CoE object 0x80nE:01 "Timer resolution".
Further Information