IFM Electronic Ecomat Mobile Series System Manual page 163

PWM in the ecomatmobile controller
Calculation examples RELOAD value
ClassicController
ExtendedController
SafetyController
CabinetController (CR0303)
The PWM frequency shall be 400 Hz.
20 MHz
_________ = 50 000
400 Hz
Thus the permissible range of the PWM value
is the range from 0000
The comparison value at which the output
switches must then be between 0000
C350 .
16
This results in the following mark-to-space ratios:
Mark-to-space ratio
Minimum
Maximum
Between minimum and maximum triggering 50 000 intermediate values (PWM values) are possible.
PWM channels 4...7 / 8...11
These 4/8 PWM channels can only be set to one common PWM frequency. For programming, the
functions PWM and PWM1000 must not be mixed.
0000
100%
Reload
Figure: RELOAD value for PWM channels 4...7 / 8...11
The RELOAD value of the internal PWM counter is calculated (for all
the basis of the parameters DIV64 and the CPU frequency as follows:
DIV64 = 0 RELOAD = 10 000
DIV64 = 1 RELOAD = 10 000
Depending on whether a high or a low PWM frequency is required, the input DIV64 must be set to
FALSE (0) or TRUE (1). In case of PWM frequencies below 39 Hz, DIV64 must be set to "1" to ensure
that the RELOAD value is not smaller than 0000
ifm System Manual ecomatmobile
= C350 = RELOAD
10 16
to C350 .
16 16
and
16
Switch-on time
Wert / Value
– ( 2.5 MHz / f
16
– ( 312.5 kHz / f
16
SmartController (CR2500) V05
SmartController
CabinetController (CR0301/CR0302)
PCB controller
The PWM frequency shall be 200 Hz.
10 MHz
_________ = 50 000
200 Hz
Thus the permissible range of the PWM value
is the range from 0000
The comparison value at which the output
switches must then be between 0000
C350 .
16
0 %
100 %
FFFF
0%
)
PWM
)
PWM
.
16
PWM signal processing
= C350
10 16
to C350
16
Value for mark-to-space ratio
C350
16
0000
16
ecomatmobile controllers) on
= RELOAD
.
16
und
16
163