GALILEOSKY GLONASS/GPS Satellite v4.0 (0223) User’s manual
GalileoSky Ltd.
Page 13
7.1.1
Pulse count
In case of a renewable counter the maximum pulse number can be 65535, after that the number is reset to
zero.
If there is pulse at input, the correspondent bit will be set in Status of Inputs field, and a point will be
recorded. If there is no another pulse for 30 seconds, the bit returns to 0.
7.1.2
Mean value and discrete event generation
Let us consider the example with the following zero input setting (see the left-hand figure
):
Filter type: 0;
Filter length: 5;
Logical one zone range is 8-33V;
Logical zero zone range is 0-3V.
The mean value is calculated continuously and
is put into the corresponding field IN0.
At the same time, it is continuously checked
whether the calculated value belongs to the
given range.
If it is in the range 8-33V, the corresponding
bit will find itself the Status of Inputs field and
a point will be recorded.
At value coming into the indifference zone
(3V-8V), the former bit value will be saved to
the Status of Inputs field.
If the value is in the logical zero zone (0V-3V),
the corresponding bit in the Status of Inputs
field is reset.
Thus, we can see that the given bit changes its
state only in the logical one/logical zero zone
Example2.
In contrast to example 1 (see the right-hand
figure) the logical one zone and the logical
zero zone have changed places.
In the same way it is possible to set zones of
response and non-response for the Terminal`s
power supply voltage (POWINCFG command, section
Analog-discrete inputs setting). The state of discrete signal
for input can be identified according to the 8th bit of the
Status of the device field.
7.1.3
Frequency count
To measure frequency in some sensors it is necessary to connect the sensor frequency output to the sensor
positive power supply via a 1kOhm resistor. Otherwise, frequency count is impossible.
7.1.4
Pulse count from two synchronously connected sensors
The
Terminal allows connection of 2 pulse sensors on one input, in this case, pulse fronts number is count,
i.e. for each sensor response counter value increases by 2. Connection circuit details are given in section
Connection of Ш2 passengers flow registration sensors.
Nonoperation
zone, logical 0
33
0
3
Operating zone,
logical 1
Indifference zone
8
В
Operating zone,
logical 1
33
0
3
Nonoperation
zone, logical 0
Indifference zone
8
В
