Contec AI-1604CI2-PCI, Руководство пользователя

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3. External Connection
40
AI-1604CI2-PCI
Connecting the Control Signal
Connecting the Input Signal
To the “External Sampling Clock Input” and “External Trigger Input” pins, connect current driven
devices such as a switch and a transistor output device. Input circuit is as follows. An external power
supply is required to drive the input circuit. The power capacity required at this time is about 11 mA
per input channel at 24 VDC (or about 5.5 mA at 12 VDC).
Figure 3.8. Input Circuit
Vcc
Vcc
HCPL-M452
Optocoupler
Optocoupler
HCPL-M452
Vcc Vcc
Plus
Common
External
Sampling
Clock Input
External
Trigger
Input
SW
SW
External power supply
12 - 24VDC
Board
External circuit
Internal
circuit
Internal
circuit
10k Ω
2.2k Ω
2.2k Ω
10k Ω