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Pulse Width Modulation - Siemens DQ 4x24VDC/2A HS User Manual

Simatic et 200sp digital output module.
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"Pulse width modulation time period" parameter
You use the "Pulse width modulation time period" parameter to specify the frequency of the
pulse width modulation activated for valve control (see section Pulse width modulation
(Page 19)).
Note: When this is parameter is set to "Off", the DQ 4×24VDC/2A HS is in normal operation
without valve control.
"Pulse width modulation duty factor" parameter
You use the "Pulse width modulation duty factor" parameter (0 to 1000) to specify the
pulse/pause duty factor of the activated pulse width modulation within the configured time
period.
Note: Unlike in the "Pulse width modulation" operating mode, the duty factor cannot be
updated cyclically depending on the output value from the user program in normal operation
with valve control.
Derating
See the information on derating of the module in the section Derating of the
DQ 4x24VDC/2A HS (Page 36).
4.4

Pulse width modulation

Function
You can operate the module in the "Pulse width modulation" operating mode. In this
operating mode, the four outputs only provide a pulse-width modulated output signal.
The digital channel is activated with a pulse/pause duty factor that is updated cyclically
depending on the output value from the user program. The actuating signal is output digitally
as a pulse sequence of on and off pulses.
Figure 4-2
Digital output module DQ 4x24VDC/2A HS (6ES7132-6BD20-0DA0)
Manual, 03/2015, A5E34944434-AA
Time period T; frequency of the pulse width modulation: f = 1/T
Pulse duration (duty factor)
Pulse width modulation
Parameters/address space
4.4 Pulse width modulation
19

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