Connecting Input Signals - Contec DIO-3232LX-USB User Manual

Connecting Input Signals

Connect the input signals to a device which can be current-driven, such as a switch or transistor output
device.
The connection requires an external power supply to feed currents.
This product inputs the ON/OFF state of the current-driven device as a digital value.
Input Circuit
Vcc
Optocoupler
Vcc
Optocoupler
* I-xx represents the input pin.
Figure 3.5. Input Circuit
The input circuits of interface blocks of this product is illustrated in Figure 3.5.
The signal inputs are isolated by Optocouplers (compatible with current sink output). This product
therefore requires an external power supply to drive the inputs. The power requirement for each input
pin is about 5.1mA at 24VDC (about 2.6mA at 12VDC).
Connecting a Switch
Input plus common (CN1 : A19pin)
I-00 (CN1 : A03pin)
When the switch is ON, the corresponding bit contains 1.
When the switch is OFF, by contrast, the bit contains 0.
Figure 3.6. An Example to use Input I-00
DIO-3232LX-USB
Unit
Plus
Un-
common
connected
Input pin
Un-
connected
Input pin
Switch
External device
External power
supply
12 - 24VDC
Switch
Switch
+
External
power supply
12 - 24VDC
-
3. External Connection
29