Contec DIO-1616TB-PE, Руководство пользователя, Страница: 45 / 63

3. External Connection
38
DIO-1616TB-PE
Connecting Input Signals
The external digital signal given to the signal input section is TTL level and each input signal is taken
into the PC side by negative logic.
Input Circuit
Input pin
ISO/5V
Vcc
GND GND
Vcc
Plus
Common
External circuit Board
JP5
GND
Vcc
JP4
ISO/GND
Minus
Common
Opto-coupler
* Input pin represents I-xx.
Figure 3.3. Input Circuit
The input circuits of interface blocks of this product are illustrated in Figure 3.3. The signal inputs are
isolated by opto-couplers. This product therefore requires the on-board internal power supply or the
external 5VDC power supply to drive the input section of this product. When using the external power
supply, 4.5mA current is requested each channel.
CAUTION
Please refer to “Selecting Power Supply” and then connect the jumper in accordance with the power
supply to be used.