Technical Specifications and Input Features
The Triconex 3501T digital input module forms a critical component within the Triconex Tricon TMR safety instrumented systems. This module provides 32 isolated digital input channels for monitoring field devices and switch status signals . It accepts 115V AC or DC inputs, making it suitable for interfacing with high-voltage industrial contacts . Each channel offers optical isolation to prevent ground loops and electrical noise interference . The module’s dimensions measure approximately 49 cm x 45.3 cm x 6.8 cm, and it weighs about 2.6 kg . It communicates with the main processor through the Triconex backplane bus .
| Parameter | Specification |
|---|---|
| Manufacturer | Triconex (Schneider Electric) |
| Model Number | 3501T |
| Product Family | Triconex Tricon / Trident |
| Product Type | Digital Input Module |
| Input Channels | 32 (isolated, non-commoned) |
| Input Voltage | 115 VAC/VDC (90-155 V range) |
| Architecture | Triple Modular Redundancy (TMR) |
| Input Current (per channel) | 6-9 mA typical |
| Input Impedance | > 8.5 kΩ |
| Turn-On Threshold | > 86 VAC/VDC |
| Turn-Off Threshold | < 28 VAC/VDC |
| Response Time (OFF to ON) | < 8 ms |
| Response Time (ON to OFF) | < 15 ms |
| Isolation Voltage | 2500 VDC (point-to-point) |
| Operating Temperature | -40°C to +85°C |
| Dimensions (W x H x D) | 49 x 45.3 x 6.8 cm |
| Weight | 2.6 kg |
| Safety Certification | SIL 3 (IEC 61508) |
| Hot Swap Support | Yes |
Functional Capabilities and TMR Architecture
The 3501T module actively monitors field contacts and switches for status changes in safety-critical applications. Its TMR architecture ensures fault-tolerant operation by processing each input through three independent channels . The module’s 2500 VDC isolation protects the system from high-voltage transients and electrical noise . Built-in self-diagnostics continuously check hardware status and signal integrity. The module supports online replacement through hot-swap functionality for uninterrupted system operation .
Application Scenarios
This digital input module suits high-integrity applications in oil and gas refineries, chemical plants, and power generation facilities. It connects with emergency shutdown pushbuttons, pressure switches, and valve position indicators. The Triconex 3501T interfaces with Tricon MP processors and DI termination panels for complete system integration . Many safety instrumented systems rely on this module for reliable high-voltage signal acquisition.
Details
| Weight | 2.85 kg |
|---|---|
| Dimensions | 41.2 × 17.8 × 6.2 mm |
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