3. External Connection
CNT24-4(PCI)H
37
One-shot Pulse Output Connection
One-shot Pulse Output Connection
When the count value of each channel and the user set value match, the circuit outputs a matched signal
for one shot (1 pulse). The signal output part uses the open collector method by photo coupler insulation.
As a result, an external power supply is needed to run the board output.
Output Circuit and an Example Connection
Output
pin
Photo coupler
1k
Ω
Plus
Common
Minus
Common
Vcc
18k
Ω
External Power Supply
5V - 12VDC
Photo coupler
Load
Load
1k
Ω
Figure 3.14. Output Circuit and an Example Connection
CAUTION
The output of this board has no surge voltage protector. To drive an inductive load such as a relay or
lamp using this board, apply surge voltage protection to the load side. For surge voltage protection,
see “Surge Voltage Countermeasures” in the next section.