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C Series Module Support for Specialty Digital Functions in Scan Mode

Updated Nov 3, 2025

Overview

This article discusses the specialty digital functions available for C Series Modules when configured for scan mode.

Introduction

Not all digital modules support special digital functions.

Specialty digital functions are:

Counter input
Counter-driven output
Pulse-width modulation (PWM) output
Quadrature encoder input

The following table outlines what modules do support specialty digital and what specific functions as of CompactRIO 15.0:

C Series Module	Digital Functions
NI 9401	Counter, Counter-Driven Output, Pulse-Width Modulation, Quadrature
NI 9402	Counter, Counter-Driven Output, Pulse-Width Modulation, Quadrature
NI 9411	Counter, Quadrature
NI 9421	Counter, Quadrature
NI 9422	Counter, Quadrature
NI 9423	Counter, Quadrature
NI 9435	Counter, Quadrature
NI 9437	Counter, Quadrature
NI 9472	Counter-Driven Output, Pulse-Width Modulation
NI 9474	Counter-Driven Output, Pulse-Width Modulation
NI 9475	Counter-Driven Output, Pulse-Width Modulation

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