C Series Digital Input and Counter/Timer Modules
NI 9401, NI 9411, NI 942x, NI 9435 NEW!
• High- and low-speed 24 V logic
(IEC 1131-2), 5 V/TTL, differential/
single-ended inputs, or universal
AC/DC inputs up to 250 VAC/VDC
• Up to 500 ns input rate
for high-speed control
or long-distance
digital communication
• Isolation up to 2,300 Vrms (withstand),
up to 250 Vrms (continuous)
• Channel-to-channel isolation
up to 1,390 Vrms (withstand),
up to 250 Vrms (continuous)
• Internal current limiting and
industrial logic thresholds
for direct connection to a
wide array of industrial
switches, encoders,
and transducers
• Up to 100 ns input rate for ultrahigh-
speed digital communication
Compatibility
Product CompactRIO NI CompactDAQ
Logic
Channels Source/Sink I/O Delay Time
Signal Levels
Isolation
Connector Options
D-Sub
NI 9401
NI 9411
NI 9421
NI 9422
NI 9423
NI 9425
NI 9435
5 V/TTL
Differential or 5 V/TTL
8
6
8
8
8
Sink/Source
–
Sink
Sink/Source
Sink
100 ns
500 ns
100 µs
250 µs
1 µs
5 V
5 to 24 V
24 V
Up to 60 V
24 V
24 V
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
ꢀ
D-Sub
ꢀ
24 V
24 V
24 V
24 V
Universal
Screw Terminal, D-Sub
Screw Terminal
Screw Terminal
D-Sub
ꢀ
ꢀ (ch-to-ch)
ꢀ
ꢀ
ꢀ
32
4
Sink
Sink/Source
7 µs
3 ms
5 to 250 VDC, 10 to 250 VAC
Screw Terminal
Table 1. C Series Digital Input and Counter/Timer Module Selection Guide
in silicon, or perform redundant safety enforcement and interlocks. Unlike
traditional digital control devices, the performance of a CompactRIO
digital control system does not decrease as the amount of digital logic
increases because of the parallel nature of the RIO FPGA circuitry.
Overview
High-performance digital input switching modules for National Instruments
CompactRIO embedded systems, R Series expansion chassis, and
NI CompactDAQ provide industrial logic levels for direct connection
to a wide array of industrial automotive switches and transducers. Each Key Features
module features an integrated connector junction box with screw terminal
• High-performance digital and counter/timer input modules for CompactRIO
or cable options for flexible and low-cost signal wiring. All modules
feature the NI CompactRIO Extreme Industrial Certifications and Ratings.
embedded system, R Series expansion chassis, or NI CompactDAQ system
• Screw terminal, D-Sub, strain relief, high-voltage cable,
solder-cup backshell, and other connectivity options
• NI CompactRIO Extreme Industrial Certifications and Ratings
• NI 9411 module that generates regulated 5 V power for quadrature
encoder or other devices
System Compatibility
You can use NI C Series modules in multiple system types depending
on available software. See Table 1 for CompactRIO and NI CompactDAQ
module compatibility because not all modules work with both systems.
Many of the advanced features described apply only to reconfigurable
I/O systems and not to NI CompactDAQ.
• Channel-to-earth ground double-isolation barrier for safety
and noise immunity and channel-to-channel isolation
Visit ni.com/compactrio or ni.com/compactdaq for up-to-date
Advanced Features
information on module availability, example programs, application notes,
When used in CompactRIO, C Series digital input modules connect directly and other developer tools.
to reconfigurable I/O (RIO) FPGA hardware to create high-performance
embedded systems. The reconfigurable FPGA hardware within CompactRIO
North American
Hazardous Locations
provides a variety of options for timing, triggering, synchronization, change
detection, digital pattern matching, or digital communication. For instance,
with CompactRIO you can implement a circuit to detect digital events
and record a timestamp, implement high-reliability digital control logic
Typical certifications – Actual specifications vary from product to
product. Visit ni.com/certification for details.
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