ICOM 200 User Manual
ICOM-manual
Opto inputs
The ICOM-241 has eight optocoupler inputs suited for an input voltage range
of 5...12 VDC. To use higher input voltages, as 24V for example, an additional
serial resistor in the input line is used. The resistor value is selected in
accordance to 4...50mA input current needed for the logical “1” level.
of 5...12 VDC. To use higher input voltages, as 24V for example, an additional
serial resistor in the input line is used. The resistor value is selected in
accordance to 4...50mA input current needed for the logical “1” level.
The internal resistance is 680 Ohm / 0,25 W. If now another input voltage is
needed, the totally required resistance can be calculated with the following
formula:
needed, the totally required resistance can be calculated with the following
formula:
3
R
ges
= (U
E
-1,3V)/I
D
U
E
= Input voltage
I
D
=
Current into the optocoupler
R
ges
= Total resistance
Example:
Is e.g. an input voltage of 24 V with a current of 10 mA wanted, you get from
the above formula Rges = 2270 Ohm. This means either the internal 680 Ohm
resistor has be replaced with a 2200 Ohm resistor (rounded to norm value), or
a resistor of 1590 Ohm has to be connected in series.
the above formula Rges = 2270 Ohm. This means either the internal 680 Ohm
resistor has be replaced with a 2200 Ohm resistor (rounded to norm value), or
a resistor of 1590 Ohm has to be connected in series.
Attention:
When calculating the protective resistance the maximum dissipation of the
resistor has to be considered!
When calculating the protective resistance the maximum dissipation of the
resistor has to be considered!
Tiny-Tiger
®
Port
Optokoppler
DB-25 socket
P80 Opto
In0
1
P81 Opto
In1
14
P82 Opto
In2
2
P83 Opto
In3
15
- Opto
GND
3
The following program reads the status of the optocoupler inputs into a
variable and sends it out through serial port 0.
variable and sends it out through serial port 0.
3-4
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