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If not configured as single-ended I/O lines, triggers have input only capability.
Note
Wiring an Isolated Input to Output Devices
Do not apply a voltage greater than 30 VDC to the isolated inputs. Voltage greater
Caution
than 30 VDC may damage the NI 1426.
Note
Isolated inputs are compatible with 5 V logic if the external circuit meets the voltage
and current requirements listed in Getting Started with the NI PCI-1426.
© National Instruments Corporation
Table 2-1. Trigger Configuration Options for the NI 1426
Trigger Number
0
1
2
3
You can wire an isolated input to both sourcing and sinking output devices.
Refer to Figures 2-3 and 2-4 for wiring examples by output type. Refer to
Getting Started with the NI PCI-1426 for information about switching
thresholds and current requirements.
Sensor
Power
PNP (Sourcing)
Output Device
Sensor
Common
Figure 2-3. Example of Connecting an Isolated Input to a Sourcing Output Device
Single-ended
Input/Output
TTL_TRIG(0)
TTL_TRIG(1)
TTL_TRIG(2)
TTL_TRIG(3)
IN +
Current
Limiter
IN –
NI 1426
2-5
Chapter 2
Hardware Overview
Alternative
Input Only
ISO_IN(0)
ISO_IN(1)
RS422_IN(0)
RS422_IN(1)
Vcc
NI PCI-1426 User Manual
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