Special Input and Output
94
Doc No: UMAN\FL\0110
Rev. No.: 1.02B
5.2.6 PWM Output Function
This function is used to output a variable duty cycle pulse train. The controllable duty cycle is 0 to 100 % (1 %
units). The PWM output is enabled when the pulse enable flag is ON. While the pulse enable flag is ON, the duty
cycle (ON duty) can be changed by changing the duty setting value (0 to 100). The frequency setting is available in
the range of 50 to 5000 Hz (1 Hz units) before turning ON the pulse enable flag. The frequency changing is not
allowed while the pulse enable is ON. Note that the minimum ON/OFF pulse duration is 100 microsec. Therefore, the
controllable ON duty range is limited depending on the frequency setting as follows. If the ON duty setting value is
not available (within 0 to 100), the pulse width error flag comes ON. (PWM output operation is continued but the duty
cycle is not guaranteed)
The function selection is done through configuration register2
Function Register/device Remarks
PWM pulse Y0
Pulse enable flag M336 Output is enabled when ON
Frequency setting register MW22 – MW23 Data range: 50 to 5000
ON duty setting register MW24 –MW25 Data range: 0 to 100
Pulse width error flag M189 ON at error (reset OFF automatically)
ON duty setting error flag M190 ON at error (reset OFF automatically)
Frequency setting error flag M191 ON at error (reset OFF automatically)
The Buffer is updated at each scan, so that the PWM frequency and duty cycle will be changed after each scan.
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