Triconex 3625 digital input (DI) module Tricon v9/v10/MX safety systems

Triconex 3625 Digital Input Module - Technical Overview

The Triconex 3625 is a high-density digital input (DI) module designed for safety-critical applications in the Triconex Tricon v9/v10/MX safety systems. It provides reliable monitoring of discrete field devices with Triple Modular Redundancy (TMR) for fault tolerance.

1. Key Specifications

Type: 32-channel Digital Input Module (24V DC typical)

Input Voltage Range: 10-30V DC (configurable thresholds)

Isolation: 1500V channel-to-channel and field-to-system

Response Time: <5ms typical

Power Consumption: 3.5W typical

Certifications: IEC 61508 SIL 3, ATEX, FM, CSA

2. Redundancy & Diagnostics

TMR Architecture: Three independent input processors with voting

Continuous Diagnostics: Detects open wires, shorts, and field power loss

Hot-Swappable: Replace without system shutdown (in redundant systems)

3. LED Indicators

LED Status Meaning

PWR Green Module powered

OK Green Normal operation

FLT Red Fault detected

CH LEDs Per channel Input state (On=Active)

4. Wiring & Termination

Termination: Requires 9721-110 or 9722-110 termination units

Field Wiring:

Max wire size: 14 AWG

Screw terminal torque: 7 in-lb (0.8 Nm)

Surge Protection: Built-in TVS diodes

5. Configuration

Debounce Time: Configurable (1-255ms)

Normal State: Configurable (N.O. or N.C. interpretation)

Fault Reporting: Programmable per channel

6. Environmental Ratings

Operating Temp: -40°C to +70°C

Humidity: 0-95% non-condensing

MTBF: >150,000 hours

7. Applications

Emergency Shutdown (ESD) systems

Fire & Gas detection inputs

Critical process monitoring

Safety interlock systems

8. Troubleshooting

Common Issues:

No Input Detection

Verify field power (24V DC)

Check termination unit connections

Verify debounce settings

Channel Faults

Check for wiring shorts/opens

Verify input voltage is within range

Inspect for damaged termination units

Maintenance Tips:

Annual contact inspection

Verify input response times during testing

Keep spare termination units available

9. Ordering Information

Base Module: 4000103-3625 (verify suffix for exact version)

Termination Unit: 9721-110 (standard density)

Replacement: Must match firmware version of existing system

10. Comparison to Similar Modules

Feature 3625 3626 3636R

Type DI DO Analog

Channels 32 16 8

Isolation 1500V 1500V 1000V

TMR Yes Yes Yes