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PWM or PWM100
Depending on the application and the requested resolution you
can choose between the functions PWM and PWM100 when
programming the application. If the application requires a high
accuracy and resolution, the more technical PWM function is
used rather than the PWM100.
If the implementation time is to be kept low and if there are no
high demands with regard to accuracy the function PWM100
can be used. In this function the PWM frequency can be
entered in Hz and the pulse/break ratio in 1% steps.
PWM frequency
Each type of valve requires a certain PWM frequency. The
frequency for the PWM function is transferred via the reload
value (function PWM) or directly as a figure in Hz (function
PWM100). The controller R360 has 2 x 4 PWM outputs which
differ in their operation, but not in their effects.
The PWM frequency is achieved by means of an internal
counter based on the CPU cycle. The counter is started when
the PWM function is initialised. Depending on the PWM output
group (0..3 or 4...7) the counter either counts down from FFFF
Hex or up from 0000 Hex. When a comparative value (VALUE)
has been reached the output is set. The output is reset when
the counter overflows (count changes from 0000 Hex to FFFF
Hex or from FFFF Hex to 0000 Hex) and the process is
restarted.
If the internal counter does not run between 0000 Hex and
FFFF Hex another preset value (RELOAD value) for the internal
counter can be transferred. This increases the PWM frequency.
The comparative value has to be within the newly defined range.
PWM channels 0 ... 3
These four PWM channels offer the highest flexibility during
parameterisation. An independent PWM frequency (RELOAD
value) can be set for each channel, and it is possible to select
between the functions PWM or PWM100.
Содержание ecomat 100 R 360 Series
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