2. Special operations.
Signal generation
Flash
This operation generates a pulsing signal as long as the
Channel
is
true
(non-zero).
When the
Channel
value is
false
(zero), the operation returns the value
0
.
When a high state appears (a non-zero value) in the
Channel
, the
Flash
operation
begins to cyclically switch between the value
1
(
Time on
) and the value
0
(
Time off
).
When the
Channel
value is
false
(zero), the operation will immediately return
0
, thus
stopping the cycle.
Pulse
This operation generates N impulses following the appearance of a trigger edge.
After a selected edge appears (
Rising
or
Falling)
in the
Channel
, pulse generation
begins. The number of pulses is determined by the
Count
parameter. Each pulse has
an active phase (when the operation returns
1
) and a non-active phase (the operation
returns
0
).
The
Retrigger
parameter defines whether the appearance of a trigger edge during
pulse generation will cause the process to restart or if it will be ignored.
State storing operations
Toggle
Changes the state between
0
and
1
each time a selected edge appears in the
Channel
(
Rising
or
Falling
)
The initial value of this operation at device startup may be defined by means of the
Default State.
Set-Reset Latch
This operation sets a new value or returns a previous value according to the settings
of two input channels:
Set Channel
and
Reset Channel
:
Set channel
value
:
Reset channel
value
:
Operation value:
true (non-zero)
false (0)
1
false (0)
true (non-zero)
0
true (non-zero)
true (non-zero)
0
false (0)
false (0)
Previous value
This function mimics an SR latch, an electronic device.
https://en.wikipedia.org/wiki/Flip-flop_(electronics)
The initial value of this operation at device startup may be defined with the Default
State parameter.
Change detection
Changed
When the value of a
Channel
changes by a predefined
Threshold
, the operation will
initiate an active state (it will return the value 1) for the next “
Time on”
seconds. If
during this time the channel value changes again by a predefined threshold, the active
state will be extended for another “
Time on”
seconds. Following the end of the active
state, the operation will again return a value
0.
Hysteresis
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