3. External Connection
PIO-64/64L(PCI)H, PI-128L(PCI)H, PO-128L(PCI)H
41
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
Figure 3.11. Input Circuit < PIO-64/64L(PCI)H >, < PI-128L(PCI)H >
The input circuit of this board is illustrated in Figure 3.11. The on-board opto-couplers isolate internal
input circuits from outside devices. The input channels are to be connected with current sinking
output signals. Driving these opto-isolated circuits require an additional power supply isolated from
the PC system. When a 12VDC external power is used, each input channel will consume about 2.6mA
current; when a 24VDC external power supply is selected, each input channel will consume about
5.1mA current.
Connecting a Switch
Figure 3.12. An Example to use Input I00 < PIO-64/64L(PCI)H >, < PI-128L(PCI)H >
External Circuit
Board
Vcc
Vcc
opto-coupler
Input Pin
Input Pin
Plus
Common
External
Power
Supply
12 - 24 VDC
Switch
* Input Pin: I-xx
Switch
opto-coupler
I-00 (CNA : 7 pin)
Common plus for input (CNA : 23 pin)
External
Power
Supply
12 - 24 VDC
+
-
B
oa
rd
Switch
