Triconex 3361 Analog Input/Digital Input Module Overview

The Triconex 3361 is a hybrid I/O module for critical control applications. It features 32 commoned points with both analog and digital channels. This module supports TMR (Triple Modular Redundant) architecture for high reliability. You can use the Triconex 3361 in safety systems and process automation. Its hot-spare design allows online module replacement without system shutdown.

Technical Specifications

General Specifications

• Total Points: 32 commoned points (16 DI for points 1–16; 16 AI for points 17–32).

• Functional Earth to Protective Earth Isolation: 500 VDC minimum.

• Functional Earth to Functional Earth (Logic) Isolation: 800 VDC minimum.

• Scan Time: Less than 1 ms for all 32 points.

• Operating Mode Support: TMR mode passes mid-value data; Dual mode passes average data.

Analog Input (AI) Features

• Nominal Input Current: 4–20 mA DC.

• Operational Current Range: 2–22 mA DC.

• Absolute Maximum Field Voltage: 33 VDC.

• Absolute Maximum Reverse Field Voltage: –0.6 VDC.

• Absolute Maximum Input Current: 50 mA DC.

• Input Bandwidth (3dB): 16 Hz.

• Source Impedance: 180 Ω.

• Input Impedance (with baseplate): 250 Ω.

• I to V Resistor: 100 Ω ±0.01%.

• Resolution: 12 bits.

• Absolute Error: 0.15% of full scale (20 mA).

• Diagnostic Feature: Force-to-value diagnostic (FVD).

Digital Input (DI) Features

• Nominal Input Voltage: 0–24 VDC.

• Operational Voltage Range: 15–30 VDC.

• Absolute Maximum Input Voltage: 33 VDC.

• Absolute Maximum Reverse Input Voltage: –0.6 VDC.

• Input Delay: Less than 10 ms (On to Off, Off to On).

• Input Impedance: More than 100 kΩ (without baseplate); approximately 3 kΩ (with baseplate).

• Input Power: 0.2 W per point at 24 VDC; 0.5 W per point at 33 VDC.

• Input Thresholds: 0–5 VDC = Off region; 6–14 VDC = transition region; 15–30 VDC = On region.

• Diagnostic (Loss of View): Force-to-value diagnostic (FVD) with less than 2 ms per test.

• Maximum Input Toggle Rate: Less than 20 per second to maintain diagnostic fault coverage.

• FVD Off State Glitch Duration: Less than 2 ms.

• FVD Off State Glitch Magnitude: Up to 36% of test voltage.

• FVD Off State Output Impedance: 0–5 VDC, greater than 100 kΩ.

• ADC Scan Time: Less than 1 ms for all DI points.

Diagnostics and Fault Handling

The Triconex 3361 sustains complete ongoing diagnostics for each channel. A detected channel failure turns on the Fault indicator. This indicator identifies a specific channel fault, not a full module failure. The Triconex 3361 operates properly with a single fault. It may continue with multiple faults present.

Compatibility

The Triconex 3361 module works with the Model 2361 AI/DI Baseplate. It also works with the AI/DI External Termination Baseplate. The module has mechanical keying to prevent wrong installation.

Installation Guide

Follow these steps to install the Triconex 3361 correctly:

1. Ensure the system power is completely off before installation.

2. Verify the baseplate is the correct Model 2361 or external termination type.

3. Check the mechanical keying alignment on the baseplate.

4. Insert the Triconex 3361 module firmly into the designated slot.

5. Secure the module using the locking mechanism.

6. Connect all field wiring according to the terminal assignments.

7. Restore power and run a full diagnostic test on all 32 points.

Packaging List

• Triconex 3361 Analog Input/Digital Input Module (1 unit)

• Anti-static protective bag (1 piece)

• Installation guide sheet (1 copy)

• Terminal block connector (1 piece)

• Module locking clip (pre-installed)

Frequently Asked Questions (FAQ)

1. Can I replace the Triconex 3361 while the system runs?
Yes, the hot-spare feature allows online replacement without any shutdown.

2. What happens if one channel fails on this module?
The Fault indicator turns on for that specific channel only. The module continues normal operation.

3. Does the Triconex 3361 work with non-Triconex baseplates?
No, it requires the Model 2361 baseplate or the AI/DI External Termination Baseplate.

4. How does the module handle data in TMR versus Dual mode?
TMR mode passes the mid-value of three votes. Dual mode passes the average value.

5. What is the scan time for all 32 points on the Triconex 3361?
The scan time is less than 1 millisecond for all analog and digital points combined.