Invensys Triconex 3503E | 24V AC/DC Input Module

Triconex 3503E Digital Input Module Overview

The 3503E Digital Input Module from Triconex represents advanced Triple Modular Redundant technology for critical safety systems. This 32-input module features three isolated channels that independently process all input data for maximum reliability. The 3503E ensures the highest integrity through comprehensive diagnostics and voting mechanisms.

Complete Technical Specifications

• Manufacturer: Triconex | Model: 3503E Digital Input Module
• Product Type: TMR Digital Input Module with Self-Test Capability
• Input Voltage: 24 VAC/VDC with 32 input points total
• Input Configuration: Commoned in groups of 8 points each
• Recommended Input Range: 20-42.5 VDC for optimal performance
• Maximum Voltage: 42.5 VAC/VDC absolute maximum rating
• Frequency Range: DC or 47-63 Hz AC operation
• Module Weight: 0.8 kg for standard installation

Electrical Characteristics

• Switching Level Off to On: Greater than 18 VAC/VDC threshold
• Switching Level On to Off: Less than 6 VAC/VDC threshold
• Nominal Turn-On Current: 6-9 mA typical operating current
• Typical Hysteresis: 4 VAC/VDC for noise immunity
• Input Delay OFF to ON: Less than 8 milliseconds response
• Input Delay ON to OFF: Less than 15 milliseconds response
• Point Isolation: 1,500 VDC isolation for safety
• Nominal Input Impedance: Greater than 1.25 KΩ impedance

Power Requirements & Diagnostics

• Nominal Field Power Load Per On Point: 0.5 watts typical
• Maximum Field Power Consumption: 1.5 watts at maximum voltage
• Diagnostic Indicators: Input Status - 1 indicator per point
• Module Status Indicators: PASS, FAULT, ACTIVE status monitoring
• Stuck Test Feature: ON for detecting stuck-ON conditions
• Color Code: Dark Red for immediate visual identification

Frequently Asked Questions

• How many input points does the 3503E have? 32 digital input points
• What voltage ranges does it support? 24 VAC/VDC, 20-42.5 VDC recommended
• What is the input delay time? OFF to ON: <8ms, ON to OFF: <15ms
• Does it support self-testing? Yes, for stuck-ON condition detection
• What type of isolation is provided? 1,500 VDC point isolation
• How are inputs grouped? 32 points commoned in groups of 8
• What is the module weight? 0.8 kg for easy handling and installation