Cognex In-Sight 1720 Series, Руководство пользователя

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Specifications
34
5.2.3 Acquisition Trigger Input Specifications
Table 5-4: Acquisition Trigger Input Specifications
Specification Description
ON 20 to 28V (24V nominal)
Voltage
OFF 0 to 3V (12V nominal threshold)
ON 2.0 to 2.9mA
OFF <150
µ
A
Resistance ~10,000 Ohms
Current
For higher current add external resistor (for example, 2.2k Ω , 0.5W for 12mA)
across inputs.
Delay
76
µ
Sec latency between leading edge of trigger and start of acquisition. Input
pulse should be minimum of 1ms wide.
The acquisition trigger input is opto-isolated. To trigger from an NPN (pull-down) type photo-
detector or PLC output, connect pin 2 (TRG+) to +24V and connect pin 3 (TRG-) to the output
of the detector. When the output turns ON, it pulls TRG- down to 0V, turning the opto-coupler
ON. To trigger from a PNP (pull-up) photo-detector or PLC output, connect pin 2 (TRG+) to
the output of the detector and connect pin 3 (TRG-) to 0V. When the output turns ON, it pulls
TRG+ up to 24V, turning the opto-coupler ON.
Figure 5-2: Acquisition Trigger Input Schematic