Contec PIO-16/16L(CB)H, Руководство пользователя

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3. External Connection
30
PIO-16/16L(CB)H
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 PC card inputs the ON/OFF state of the current-driven device as a digital value.
Input Circuit
PIO-16/16L(CB)H
Switch
* Input pin represents I-xx.
Disconnection
External circuit
Optocoupler
Optocoupler
Input
pin
Input
pin
Plus
common
External
power supply
12V to 24VDC
Switch
Disconnection
Figure 3.3. Input Circuit
The input circuits of interface blocks of the PIO-16/16L(CB)H is illustrated in Figure 3.3.
The signal inputs are isolated by opto-couplers (ready to accept current sinking output signals). The PC
card therefore requires an external power supply to drive the inputs. The power requirement for each
input pin is about 5.1 mA at 24 VDC (about 2.6 mA at 12 VDC).
Connecting a Switch
PI
O
-1
6/
16
L
(CB)H
s
id
e
Input plus common (CN1 : 18 pin)
I-00 (CN1 : 2 pin)
External
power supply
12 to 24VDC
+
-
When the switch is ON, the corresponding bit contains 1.
When the switch is OFF, by contrast, the bit contains 0.
Figure 3.4. An Example to use Input I-00