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

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3. External Connection
PIO-16/16L(CB)H
31
Output Circuit
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 PC card controls turning on/off the current-driven controlled device using a digital value.
Output Circuit
PIO-16/16L(CB)H
* Output pin reprezents O-xx
*
*
External circuit
Plus
common
Output
pin
External
power supply
12V to 24VDC
Output
pin
Load
Load
Optocoupler
Optocoupler
Minus
common
Zener diode
Zener diode
Poly-switch
Figure 3.5. Output Circuit
The output circuits of interface blocks of the PIO-16/16L(CB)H is illustrated in Figure 3.5. The signal
output section is an opto-coupler isolated, open-collector output (current sink type). Driving the output
section requires an external power supply.
The rated output current per channel is 100 mA 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 50 mA or at most 1.0V at an output current within 100 mA.
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 PC card 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.