Identification System OBID
i-scan
Page 10 of 20
FEIG ELECTRONIC GmbH
3.4. X7: Inputs (optocoupler isolated)
The optocoupler inputs on Terminal X7 are galvanically isolated from the Reader electronics and
must therefore be powered by a separate external DC supply. The input LED’s on the optocou-
plers have an internal input series resistor of 500
Ω
. For supply voltages above 10V the input cur-
rent must be limited to max. 20 mA by an additional external dropping resistor (see Table 3.4-1).
Terminal
Name
Description
1
IN1+
+ Input 1
2
IN1-
- Input 1
3
IN2+
+ Input 2
4
IN2-
- Input 2
For cable lengths greater than 3 m use shielded cable.
Notes:
•
The inputs are designed for a maximum input voltage of 24 V DC and an input current of
maximum 20 mA
•
Reversing the polarity or overloading the inputs will destroy the unit
•
The supply voltage of the Reader may not be used for driving the inputs, since the
added noise may result in reduced effective reading distances.
Fig. 3.4-1: Internal and possible external wiring of the optocoupler inputs
External voltage U
ext
Required external dropping
resistor R
ext
5 V ... 10 V
---
11 V ... 15 V
270
Ω
16 V ... 20 V
560
Ω
21 V ... 24 V
820
Ω
Table 3.4-1: Required external dropping resistor R
ext
X7
2
3
4
IN1 +
IN1 -
IN2 +
IN2 -
R
1
int
R
int
R
ext
R
ext
ID ISC.LRM200
U
ext.
U
ext.