ADLINK EOS-1200 - Manual (Page 37)

Introduction 25
EOS-1200
To reduce the current and the power drawn, on a monitored cir-
cuit, for example, another resistor can be added in series with
the 2.4 kΩ current-limiting resistor, as shown.
It is recommended a resistance value be chosen allowing at least
5 mA through the diode, assuming a maximum drop across the
diode of 0.5 V.
For example, for 24 V inputs a maximum resistance for Rs can be
found by the formula:
(24 V-0.5 V)/5 mA – 2.4 kΩ = 2.3 kΩ
Computer
Ground
10 k Ÿ
+3.3
V
2.4 k Ÿ
EOS-1200
DI
ISO_COM
Supply
L
o
a
d
Rs
I f