Cognex In-Sight 1000, Инструкция по установке

Страница: 38 / 46

Section 3: Specifications Installing In-Sight™ 1000 Series Vision Sensors
30
3.2.2 Acquisition Trigger Input
Table 3-3: Acquisition Trigger Input Specifications
SPECIFICATION DESCRIPTION
ON 20 to 28V (24V nominal) Voltage
OFF 0 to 3V (12V nominal threshold)
ON 0.9 to 1.3mA
OFF <150 µ A
Resistance ~22,000 Ohms
Current
For higher current add external resistor (for example, 2.2k Ω , 0 . 5W for 12mA) across inputs.
Delay
250 µ Sec latency between leading edge of trigger and start of acquisition. Input pulse should be minimum
of 1 ms wide.
The acquisition trigger input on the 1000 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.
NOTE When using the In-Sight 1000 with the Breakout Cable, the polarity of the input trigger (pins 2
and 3) is not critical. However, when using the optional Breakout or I/O Expansion Modules, the
polarity of the TRG+ and TRG- terminals should be observed.
Figure 3-1: Acquisition Trigger Input Schematic