3. External Connection
32
DIO-1616RL-PE, DIO-3232RL-PE
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.
The board inputs the ON/OFF state of the current-driven device as a digital value.
Input Circuit
* Input pin represents I-xx.
Figure 3.5. Input Circuit
The input circuits of interface blocks of the DIO-1616RL-PE, DIO-3232RL-PE are illustrated in
Figure 3.5.
The signal inputs are isolated by opto-couplers (corresponding to the current source output). The
board 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).
External device
Board
Vcc
Vcc
Input pin
Input pin
External
power supply
12 - 24VDC
Swich
Swich
un-connect
un-connect
Optocoupler
Optocoupler
Minus
common