3. External Connection
DIO-6464L-PE, DI-128L-PE, DO-128L-PE
49
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
Vcc
Vcc
opto-coupler
Input Pin
Input Pin
Plus
Common
External
Power
Supply
12 - 24 VDC
Switch
Switch
opto-coupler
* I-xx shows input pins.
Figure 3.11. Input Circuit < DIO-6464L-PE >, < DI-128L-PE >
The < DIO-6464L-PE >, < DI-128L-PE > input circuit of interface is illustrated in Figure 3.11.
The signal inputs are isolated by Optocoupler (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 5.1mA at 24VDC (about 2.6mA at 12VDC).
Connecting to the Switch
I-00 (CNA : 7 pin)
Common plus for input (CNA : 23 pin)
External
Power
Supply
12 - 24 VDC
+
-
Bo
ar
d
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-6464L-PE >, < DI-128L-PE >