Product Description: Woodward 5461-779 Relay Input Module

Product Model: 5461-779

Brand: Woodward

Product Type: 500 Series Industrial Isolated Relay Input Module

I. Product Overview

The Woodward 5461-779 is a 16-channel isolated digital (relay) input module specifically designed for high-reliability industrial control systems. It serves as the signal interface between the control system and the on-site switch equipment, responsible for collecting, isolating, filtering, and transmitting status signals such as dry contacts, limit switches, pressure switches, and level switches. It is widely used in critical automation scenarios such as power generation, petrochemicals, and metallurgy, ensuring the stable and safe operation of the control system in strong interference environments.

Core Functions: Multi-channel dry contact signal collection, electrical isolation, noise filtering, status indication

Application Fields: 505/505E/NetCon Control System, DCS/PLC System Expansion

Product Form: Standard modular card, supports rack / rail installation 

II. Core Technical Parameters

1. Electrical Specifications

Power Supply: 24 VDC (18–32 VDC)

Input Channels: 16 independent isolated dry contact inputs

Input Types: Passive relay contacts, NPN/PNP proximity switches

Input Thresholds:

Conduction (ON): ≤ 3 VDC

Conduction (OFF): ≥ 18 VDC

Isolation Voltage: 2500 VAC between channels / between systems with full electrical isolation

Input Filtering: Hardware RC filtering + software digital filtering, anti-interference

Status Indicators: Independent LED indicators per channel (on = ON, off = OFF)

Response Time: ≤ 10 ms

Communication Interface: Dedicated backplane bus (compatible with Woodward 500 series control system)

Safety Certification: Class I, Div 2 explosion-proof certification

2. Mechanical and Environmental

Operating Temperature: -40°C ～ +70°C

Storage Temperature: -55°C ～ +85°C

Relative Humidity: 5–95% RH (no condensation)

Protection Level: IP20 (installed in cabinet)

Installation Method: Standard 19-inch rack / rail mounting

Vibration / Shock Resistance: Compliant with IEC 60068-2-6 / IEC 60068-2-27

Weight: Approximately 0.90 kg

Size: Standard Eurocard specification

3. Performance Characteristics

Fully Isolated Design: 16 independent input channels are electrically isolated from each other, completely blocking ground current and surge voltages from damaging the system

High Anti-Interference: Dual filtering mechanism, effectively suppressing industrial site electromagnetic interference (EMI), radio frequency interference (RFI)

Real-time Status Monitoring: Each channel is equipped with an LED that displays the input status, facilitating local diagnosis and maintenance

Fault Safety: When input lines are disconnected / short-circuited, the controller can detect and trigger the preset fault safety action

Plug-and-Play: Supports hot-swapping (powered insertion), maintenance without system power-off

III. Main Functional Characteristics

16 Independent Isolated Inputs

A single module provides 16 dry contact inputs, high-density integration, saving cabinet space.

2500VAC Full Isolation, ensuring strong industrial signals do not interfere or damage the core module of the control system.

Dual Anti-Interference Filtering

Hardware RC filtering circuit + programmable software digital filtering, dual filtering of on-site noise.

Ensuring 100% accurate signal acquisition in strong electromagnetic, high-vibration industrial environments.

Intuitive Status Diagnosis

Each channel is equipped with a high-brightness LED indicator, making the operating status clear at a glance.

Supports remote reading of status by the controller, diagnosing channel faults, and achieving remote monitoring without human intervention.

Wide Temperature Industrial Grade Reliability

-40°C ～ +70°C Ultra-wide operating temperature, suitable for extreme environments.

Complies with military-grade vibration / shock standards, operating stably in generators, compressors, and other strong vibration equipment. High anti-interference capability: Dual filtering by hardware and software, zero misjudgment even in harsh electromagnetic environments

Easy diagnosis: Local LED + remote diagnosis, quick fault location and high maintenance efficiency

Strong compatibility: Perfectly compatible with the entire series of Woodward 505/505E/NetCon control systems

Extremely long lifespan: Industrial-grade components, fanless design, MTBF > 1,000,000 hours

Six. Model Number Interpretation

5461: Model number of Woodward 500 series I/O module

779: Hardware configuration code (16 channels, relay input, 2500VAC isolation, 24VDC, wide temperature range, explosion-proof, LED status indication, hot-swappable)

Seven. Standard Accessories

Connection cable: Multi-core shielded cable (for connecting on-site switch equipment)

Terminal connector: Spring type / screw type wiring terminals

Installation bracket: Standard 35mm DIN bracket

Frame: Special control frame for Woodward 500 series