X90 mobile modules
X90 mobile system User's manual V 1.20 - Translation of the original manual
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5.7.1.7.8 Pulse width modulation (PWM)
The channels can be configured as PWM outputs. 2 data points are available per channel for controlling the PWM
signal.
U
t
24 VDC
Pulse width
Period (frequency)
Figure 127: The PWM signal is controlled by setting the pulse width and period duration
Topics in this section:
•
Period duration of the PWM outputs
•
Duty cycle of the PWM outputs
5.7.1.7.8.1 Period duration of the PWM outputs
Name:
PWMPeriod01 to PWMPeriod08
These registers define the period duration, i.e. the time base for the respective PWM output. This time represents
the 100% value, which can be incremented in 1% steps through the duty cycle.
Data type
Values
Information
UINT
1000 to 65535
Period duration in µs
The minimum period duration is 1000 [µs] (1 kHz). A PWM signal is not output for smaller values.
5.7.1.7.8.2 Duty cycle of the PWM outputs
Name:
PWMOutput01 to PWMOutput08
These registers output the ratio of switch on/off time (duty cycle) of the respective PWM output at 1% resolution
in relation to the period duration.
Data type
Values
Information
UINT
0 to 100
Duty cycle of the output in 0 to 100%
Example
Period duration T = 4000 [µs] with a duty cycle of 25% equals a switch-on time t
1
of 1000 [µs].
t
1
t
T
1
U
t
24 VDC
T
= 0.25 = 25%
Figure 128: Switch-on time depending on the period duration and duty cycle
