Description
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | 5466-1158 |
| Manufacturer | Woodward |
| Product family | MicroNet |
| Module type | Simplex 48/24 HDDIO-2 Smart-Plus |
| Discrete inputs | 48 channels |
| Discrete outputs | 24 channels |
| Input type | Optically isolated / galvanically isolated |
| Input update time | 5 ms |
| Output update time | 5 ms |
| Input ON threshold | Greater than 16 VDC at 3 mA |
| Input OFF threshold | 8 VDC at 1.5 mA |
| External FTM voltage | 18–32 VDC |
| Input current | Approximately 4 mA at 24 VDC |
| Isolation | 500 VDC to earth ground; 1,000 VDC to control common |
| Input event timestamping | 500 μs resolution |
| FTM configuration | Supported 48/24 or 24/12 discrete termination arrangements |
| Controller platform | Woodward MicroNet |
| Application | Simplex turbine and industrial control |
| Software compatibility | Coder 4.06 legacy compatibility |
The I/O figures and electrical thresholds are based on Woodward’s MicroNet documentation. Output electrical ratings depend on the selected field termination and relay hardware; they should not be inferred from the channel count alone.
Product Introduction
Woodward 5466-1158 MicroNet Discrete I/O Module
The Woodward 5466-1158 is a 48-input, 24-output discrete I/O module designed for MicroNet Simplex control systems. It interfaces field contact signals with the controller and provides discrete output channels for external control devices. The Smart-Plus architecture supports high-density signal handling within the MicroNet control chassis.
5466-1158
This module is particularly relevant to legacy turbine-control installations. Woodward’s 505DE documentation identifies the 5466-1158 as a Simplex 48/24 HDDIO-2 Smart-Plus module and lists it in the 505DE system bill of materials. This makes exact controller and termination compatibility important during replacement planning.
Application Scenarios & Field Pitfalls
The 5466-1158 is used in control systems that need a high number of discrete status inputs and command outputs. In turbine applications, these signals may support permissives, equipment status, alarms, interlocks, and control sequences. A replacement with the same channel count is not sufficient unless its software and field termination configuration also match.
Typical application scenarios
- Steam turbine control using Woodward 505DE systems.
- MicroNet Simplex discrete signal acquisition.
- Monitoring field contacts, switches, and equipment status.
- Controlling relay-based discrete output circuits.
- Maintaining legacy turbine automation cabinets.
Field-engineering precautions
- Verify Coder compatibility. Woodward distinguishes the 5466-1158 from newer HDDIO implementations. The 5466-1158 is identified as the legacy Coder 4.06-compatible version. Do not substitute a newer module based only on matching I/O capacity.
- Confirm the FTM arrangement. The system may use a 48/24 Discrete FTM or a different supported termination arrangement. Check the existing FTM, cable routing, and connector assignments.
- Check field voltage thresholds. The documented 48/24 FTM uses an OFF threshold of 8 VDC and an ON threshold above 16 VDC. Verify that connected field devices meet these requirements.
- Inspect output hardware separately. Relay modules and field termination hardware determine the actual output switching characteristics. Confirm contact ratings and load requirements before connecting actuators or interposing relays.
- Protect the configuration during replacement. Record channel assignments, application settings, and field wiring before removing the original module. Test representative input and output channels before returning the turbine to service.
Related Products
- 5466-1156 — MicroNet TMR 48/24 HDDIO-2 Smart-Plus module. Intended for TMR architecture; not an automatic substitute for the Simplex 5466-1158.
- 5466-1050 — Newer MicroNet Simplex 48/24 HDDIO Smart-Plus module for applicable newer Coder configurations. Verify software compatibility before migration.
- 5466-1051 — TMR counterpart for newer MicroNet HDDIO applications.
- 5466-258 — Earlier Simplex 48-input/24-output discrete I/O module. Woodward’s 505DE manual revision history records its replacement by 5466-1158 in the relevant bill of materials.
- 5441-693 — High-density discrete I/O field termination module with 24 inputs and 12 outputs, used in compatible MicroNet arrangements.
- 5466-1035 — MicroNet CPU5200 processor module used in the documented 505DE control-system configuration. It is a controller processor, not an I/O substitute.
Procurement note: Woodward’s documentation establishes the 5466-1158 as a Simplex 48/24 HDDIO-2 Smart-Plus module. Before purchasing, confirm the installed Coder version, MicroNet chassis, FTM model, and cable arrangement. For used or surplus units, request a test report covering input-channel detection, output switching, LED diagnostics, and connector condition. A basic power-on test is not sufficient for a turbine-control spare.
