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ICOM-200 / 201

Opto inputs

The ICOM-200/201 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.

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:

ges

= (U

-1,3V)/I

= Input voltage

= Current into the optocoupler

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 R

ges

= 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 1500 Ohm has to be connected in series.

The optocoupled inputs are realized as extended inputs of the Tiny Tiger.

They can be accessed under logical port address 11h (physical 1).

Both USER_EPORT instructions in the sample program are urgent.

Optocoupler pin DB37 socket

Opto In0 6

Opto In1 25

Opto In2 7

Opto In3 26

Opto In4 8

Opto In5 27

Opto In6 9

Opto In7 28

GND 10

Wilke Technology GmbH • 0241/918900 • http://www.wilke.de/ • [email protected] 2-11

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ICOM 200 Manuale Utente Pagina 19