3. External Connection
DIO-3232L-PE, DI-64L-PE, DO-64L-PE
37
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 represent input signals.
Figure 3.11. Input Circuit < DIO-3232L-PE >, < DI-64L-PE >
The input circuits of interface blocks of the < DIO-3232L-PE >, < DI-64L-PE > is illustrated in Figure
3.11. The signal inputs are isolated by opto-couplers (ready to accept current sinking output signals).
The board 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
When the switch is ON, the corresponding bit contains 1.
When the switch is OFF, by contrast, the bit contains 0.
Figure 3.12. An Example to use Input I-00 < DIO-3232L-PE >, < DI-64L-PE >
External circuit
Board
Vcc
Vcc
Plus
common
External
power supply
12 - 24VDC
Opto-coupler
Input pin
Switch
Opto-coupler
Input pin
Switch
Un-
connected
Un-
connected
I-00 (CN1 : A03pin)
Input plus common (CN1 : A19pin)
External
power supply
12 - 24VDC
+
-
B
oa
rd
s
id
e
Switch