Contec AO-1604CI2-PCI, User Manual

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3. External Connection
AO-1604CI2-PCI
39
Control signals Connection
Input signals connection
To the “External Sampling Clock Input” and “External Start Trigger Input”, 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).
+Common
External
Trigger
Input
External
Sampling
Clock
Input
SW
External circuit Board
External power supply
12V - 24VDC
Vcc
Opto-coupler
HCPL-M452
Vcc
HCPL-M452
Vcc
Vcc
Internal circuit
Opto-coupler
SW
Internal circuit
10k Ω
2.2k Ω
10k Ω
2.2k Ω
Figure 3.7. Input circuit