The Triconex DI3301 is a triple-module redundancy (TMR) digital input module designed specifically for industrial safety instrumented systems (SIS) and critical control applications.

It processes field digital signals—such as switch states, limit signals, and alarm signals—in parallel across three independent channels, ensuring that a failure in a single channel does not affect system operation.

This module is part of Triconex TRICON series and serves as a core component of TÜV-certified SIL 3 safety instrumented systems.

• Number of Input Channels: 8 channels (independent triple redundancy per channel, for a total of 24 logic inputs)
• Signal Types: Supports dry contacts (passive contacts) and wet contacts (active contacts, selectable between 24V DC and 110V DC)
• Input voltage range: Dry contacts compatible with 5V-30V DC; wet contacts support 24V DC (±15%) / 110V DC (±20%)
• Operating Temperature: -40℃ to +70℃
• Storage Temperature: -55°C to +85℃
• Protection Rating: IP20 (rack-mounted), optional IP67 sealed enclosure
• Vibration/Shock Resistance: 10g sinusoidal vibration (5-500 Hz), 50g shock (11 ms half-sine wave)

After a compressor station on a long-distance natural gas pipeline began using the DI3301, it detected pressure switch activation and triggered an emergency shutdown (ESD) within 5 ms, representing a 75% improvement in response time compared to traditional systems (20 ms).

What peripheral equipment is required for the DI3301?
It must be used in conjunction with the Triconex safety instrumented system and configured using the configuration software provided with the system.

What should I do if the module isn't responding?
First, measure the voltage across the input or output terminal blocks. If the voltage is correct but the module still isn't responding, replace the module. If replacing the module doesn't resolve the issue, there may be a problem with the on-site connections.

How can system security be ensured?
System security is ensured through redundant design, self-diagnostic functions, and regular maintenance.

Download Triconex System Documentation (PDF)