Contec PIO-16, Руководство пользователя

Страница: 36 / 54

3. External Connection
PIO-16/16RY(PCI)
29
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
External Circuit Board
Input Pin
Input Pin
Input
Common
External
Power Supply
12 - 24 VDC
or
24 - 48 VDC
Switch
Switch
* Input Pin: I-xx
Vcc
opto-coupler
Vcc
opto-coupler
JP
3
2
1
JP
3
2
1
Figure 3.3. Input Circuit
The input circuits of interface blocks of the board are illustrated in Figure 3.3. For each input channel,
use the corresponding jumper to select a voltage range of 12 - 24 or 24 - 48 VDC depending on the
voltage of the input signal.
The signal inputs are isolated by opto-couplers (Both of current sink and source outputs supported). The
board therefore requires an external power supply to drive the inputs. The power capacity required for
driving each input channel is about 8 mA when the signal voltage is 48 VDC (with the 24 - 48 VDC
setting) or about 4 mA when the signal voltage is 12 VDC (with the 12 - 24 VDC setting).
Connecting a Switch
I-00 (CN1 : 2pin)
Input common (CN1 : 18pin)
External
power supply
12 - 24 VDC
+
-
Bo
ar
d s
id
e
When the switch is ON, the corresponding bit contains 1.
When the switch is OFF, by contrast, the bit contains 0.
Switch
Figure 3.4. An Example to use Input I-00