SMY133-SMY134-SMP133 Operating Manual
After the setup, if any change of the condition occurs, pulse of specified duration appears :
•
on the output set as
On,
when false-to-true change
•
on the output set as
Off,
when true-to-false change
6.2.1.5 Frequency Counter (FC)
The digital input can be used for monitoring of a quantity depending on frequency or duty cycle of
incoming pulses.
6.2.1.5.1 Frequency Mode
As example, flowmeters or anemometers with pulse output (often the „S0-type“) can be connected and
the instrument can measure and record a flow rate or a wind speed. So despite being so called, this
quantity is not any counter but a frequency controlled quantity.
Select an empty clause and add the
Frequency Counter
action. In the
Type
field choose
Frequency
. In
the
Properties
field below you can set :
•
name
of the quantity (for example
Vwind
)
•
unit
of the quantity (
m/s
)
•
transformation ratio in one of two formats :
•
either
Hz / Unit
… frequency of the input pulses in hertzs corresponding to one unit
•
or
Units / Hz
… value of the quantity (in the set units) in case the input pulse
frequency is 1 Hz
If the name is not defined, the quantity is referenced with its general name
FCxx
(when the
xx
is index
of corresponding digital input).
6.2.1.5.2 PWM Mode
In this mode the duty cycle of incoming signal controls the counter value. Such signal is
often called
PWM
(Pulse With Modulation) too.
In the
Type
field choose
PWM
. The other settings are the same as that of
Frequency
type excluding
the transformation ratio – it is specified with limit values for duty of 100% (permanently active input)
and 0% (permanently inactive input).
6.2.1.6 Pulse Counter (PC)
Similarly, counters of incoming pulses can be checked for all of digital inputs. The counters usually
represent amount of a media passing since last counter clearing.
Add the
Pulse Counter
action and set :
•
name
of the counter (for example
Barrel1
)
•
unit
of the quantity (
hl
)
•
transformation ratio in one of two formats :
•
either
Pulses / Unit
… number of the input pulses corresponding to one unit
•
or
Units / Pulse
… value of the quantity (in the set units) corresponding to one pulse
46
Fig. 6.6 : I/O Setup – FC Action Properties
