DI3301 | Triconex 3301 | Digital Input Module

Overview

The Model 3301 Digital Input Module processes input data through three independent channels. Each channel has an ASIC that scans input points, compiles data, and transmits it to the MPs upon request. The MPs vote on the data before processing to ensure accuracy and integrity.

Diagnostics and Fault Detection

The DI Module continuously checks each channel for faults. If it detects a fault on any channel, the Fault indicator lights up, triggering the system alarm. However, this indicator signals only a specific channel fault, not a module failure. The module keeps operating correctly with a single fault and can handle certain multiple faults without issue.

The DI Module also verifies the system’s ability to detect state transitions. Additionally, it supports hot sparing, which allows users to replace a faulty module online or keep a backup active. To prevent improper installation, the module is mechanically keyed when placed in the baseplate.

Model 3301 Digital Input Module Specifications

Feature	Specification
Points	32, commoned
Nominal Input Voltage	24 V DC
Operational Voltage Range	15–30 V DC
Absolute Maximum Input Voltage	33 V DC
Absolute Maximum Reverse Input Voltage	–0.6 V DC
Input Delay	<10 ms, On to Off or Off to On
TC	6.4 ms, –3dB @ 25Hz
Input Impedance	>30 kΩ without baseplate, ≈3 kΩ with baseplate
Input Power	0.2 W/pt @ 24 V DC; 0.5 W/pt @ 33 V DC
Input Threshold	0–5 V DC = Off region; 6–14 V DC = transition region; 15–30 V DC = On region
Diagnostic (Loss of View)	Force-to-value diagnostic (FVD), <2 ms/test
Maximum Input Toggle Rate	<20/sec (to maintain diagnostic fault coverage)
FVD Off-State Glitch Duration	<2 ms
FVD Magnitude	≈36% of test voltage
Output Impedance	0–5 V DC, ≈100 kΩ
ADC Scan Time	<1 ms for all 32 points
Functional-to-Protective-Earth Isolation	500 V DC minimum
Functional-to-Functional-Earth (Logic) Isolation	800 V DC minimum

Notes:

• The DI Module uses the Force-to-Value Diagnostic (FVD) to detect faults in less than 2 milliseconds.
• The Module 3301 supports a maximum input toggle rate of 20 times per second, ensuring full diagnostic coverage.
• The module maintains 500 V DC isolation to protective earth and 800 V DC isolation to functional earth, ensuring system safety.

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