User Manual For - CONTROLLER/DATA RECORDER MultiCon CMC-99/141
logical channel will be a data source for this built-in output (see
–
Levels
parameter block - these parameters allow the user to set the range of the
input signal which will change the duty cycle of the output signal, discussed below in
this
Chapter
,
–
Timing
parameter block - these parameters allow the user to set the timing
parameters of the output signal, discussed below in this
Chapter
,
Levels
parameter block
The parameters are:
–
Lower level
and
Upper level
- by setting these parameters the range is defined
within which the change duty cycle of pulse depending on the source signal; below
this range the signal is zero (zero width, zero duty cycle) and above this range the
signal is completely filled (fully on of the cycle period) (see
–
Alarm level
- when the data source for the built-in output returns the
Error
state or
the range being exceeded: the low
-Lo-
state and high
-Hi-
state, the
Alarm level
parameter for the PWM mode allows setting the duty cycle of the output signal in
time of an alarm state according to the parameters of
Lower level
and
Upper level
,
The duty cycle
D
is defined as the ratio between the pulse duration
t
and the period
Τ
of
a rectangular waveform:
duty cycle
D
=
t
T
where:
t - is the duration that the function is active
Τ - is the period of the function.
Fig. 7.93. Normalized duration (
t
n
) of the output signal in PWM mode for parameters:
Lower
level
=4,
Upper level
=14 (input signal lower than 4 has
t
n
=0, higher than 14 has
t
n
=1)
170
0
2
4
6
8
10
12
14
16
0
0,2
0,4
0,6
0,8
1
Lower
level
Upper
level
D
Input
value