3. External Connection
50
DIO-6464L-PE, DI-128L-PE, DO-128L-PE
Connecting Output Signals
Connect the output signals to a current-driven controlled device such as a relay or LED.
The connection requires an external power supply to feed currents.
The board controls turning on/off the current-driven controlled device using a digital value.
Output Circuit
External Circuit
Plus
Common
Output
Pin
Board
Vcc
Zener
diode
Poly Switch
External
Power
Supply
12 - 24 VDC
Output
Pin
Minnus
Common
Zener
diode
opto-isolated
opto-isolated
Load
Load
* O-xx shows output pins.
Figure 3.13. Output Circuit < DIO-6464L-PE >, < DO-128L-PE >
The < DIO-6464L-PE >, < DO-128L-PE > output circuit of interface is illustrated in Figure 3.13.
The signal output section is an Optocoupler isolated, open-collector output (current sink type). Driving
the output section requires an external power supply.
The rated output current per channel is 100mA at maximum.
The output section can also be connected to a TTL level input as it uses a low-saturated transistor for
output. The residual voltage (low-level voltage) between the collector and emitter with the output on is
0.5V or less at an output current within 50mA or at most 1.0V at an output current within 100mA.
A zener diode is connected to the output transistor for protection from surge voltages. A
PolySwitch-based overcurrent protector is provided for every eight output transistors. When the
overcurrent protector works, the output section of the board is temporarily disabled. If this is the case,
turn of the power to the PC and the external power supply and wait for a few minutes, then turn them on
back.
CAUTION
When the PC is turned on, all output are reset to OFF.