PLCs, Power Supplies & Others

Product Overview

The Triconex 3501E functions as a high-voltage digital input module for Triconex Safety Instrumented Systems. It monitors 32 field contact inputs accepting both AC and DC signals. This module provides reliable status acquisition for safety applications using 115 V nominal voltages.

Key Technical Specifications

Engineers select this module for its wide voltage range and exceptional point isolation. Its robust design handles demanding industrial power distribution monitoring. Below, we detail the core technical parameters.

Detailed Features and Benefits

Wide-Range AC/DC Input Compatibility
The Triconex 3501E accepts both AC and DC signals across 90–155 V range. This flexibility allows direct connection to 115 VAC control transformers or 125 VDC battery systems. Consequently, you eliminate the need for external signal conditioners in many applications.

Superior Channel Isolation for System Protection
Each of the 32 inputs features 1500–2500 VDC galvanic isolation from other channels. This isolation prevents ground loops and voltage transients from spreading between field devices. Therefore, a fault on one input cannot compromise the remaining 31 channels.

TMR Architecture for Unmatched Safety Integrity
This module utilizes Triple Modular Redundant technology for every input channel. It processes each field signal through three independent voting circuits. As a result, a single component failure cannot cause a spurious trip or prevent a valid safety demand.

Precise 6–9 mA Input Sensing
The module draws a consistent 6–9 mA from each field contact for reliable state detection. This current ensures adequate wetting for switch contacts without excessive power dissipation. Thus, you achieve dependable operation even with marginal field devices.

Low Power Consumption for Efficient Operation
At only 2.9 Watts typical power draw, the 3501E minimizes loading on the chassis backplane. This efficiency allows higher module density within your safety system cabinet. Consequently, you maximize I/O capacity without exceeding power budgets.

Comprehensive Frequency Response for AC Signals
The module accurately senses AC inputs across the full 47–63 Hz industrial frequency range. It captures both 50 Hz and 60 Hz power system signals without adjustment. This feature proves essential for monitoring motor starter auxiliaries and power contacts.

Applications for High-Voltage Input Monitoring

Motor Control Center Monitoring
The Triconex 3501E directly interfaces with 115 VAC motor starter auxiliary contacts. It provides start/run/stop status to the safety system without interposing relays. You can monitor hundreds of motors with clean, simple wiring.

HVAC and Utility System Integration
This module connects to building management system outputs and utility permissive contacts. It accepts standard 115 VAC signals common in facility power distribution. Therefore, you integrate facility status into your safety logic seamlessly.

Generator and Switchgear Indication
For power generation applications, the 3501E monitors breaker positions and alarm contacts. Its 155 V maximum rating accommodates station battery voltages with margin. This capability ensures reliable status from critical power equipment.

Details