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Product Overview
The WOODWARD 5466-1156 is a MicroNet TMR 48/24 HDDIO-2 Smart-Plus module intended for redundant turbine and engine control applications. It provides 48 discrete inputs and 24 discrete outputs, giving the controller a high-density interface for status signals, permissives, alarms, trips, and relay commands. Woodward identifies this version as a backward-compatible spare for older MicroNet TMR HDD applications using Coder 4.06. It is specifically intended for TMR installations rather than being a general-purpose I/O card.
The input circuits are optically isolated, while the associated field termination arrangement supports 24 VDC discrete signals. Outputs can interface with compatible relay modules through the specified FTM and cable arrangement. The module does not require field calibration or potentiometer adjustment. For maintenance teams, the practical concern is compatibility: firmware/Coder revision, TMR architecture, FTM type, and replacement status should all be checked before installation.
Technical Specifications — 5466-1156
| Parameter | Value |
|---|---|
| Product Model | 5466-1156 |
| Manufacturer | Woodward |
| Product Type | MicroNet TMR 48/24 HDDIO-2 Smart-Plus Digital I/O Module |
| Series | MicroNet TMR |
| Discrete Inputs | 48 channels |
| Discrete Outputs | 24 channels |
| Input Type | Optically isolated discrete input |
| Typical Input Threshold | 8 VDC at 1.5 mA = OFF; >16 VDC at 3 mA = ON |
| Field Interface | 24 VDC 48/24 or compatible discrete FTM configuration |
| Output Update Time | 5 ms |
| Input Update Time | 5 ms |
| Isolation | 500 VDC to earth ground; 1,000 VDC to control common |
| Contact Supply | Isolated 24 VDC, up to 400 mA |
| Time Stamping | 500 μs resolution |
| Operating Temperature | 0 to +55 °C |
| Storage Temperature | −40 to +105 °C |
| Calibration | Not required |
| Mounting | MicroNet chassis card slot |
| Application | TMR redundant control systems |
The electrical values above are taken from Woodward MicroNet documentation; actual field configuration depends on the installed FTM and system architecture.
WOODWARD 5466-1156
Key Features and Benefits — 5466-1156
- 48 discrete input channels and 24 discrete output channels.
- Designed for MicroNet TMR redundant control architectures.
- Optical isolation helps separate field discrete signals from control electronics.
- Supports 24 VDC discrete field termination arrangements.
- 5 ms I/O update performance is suitable for turbine-control sequencing and discrete protection logic.
- No calibration potentiometers are required.
- Backward-compatible spare for selected legacy MicroNet TMR HDD applications.
- Appropriate for applications requiring replacement of older HDD module functionality.
Related Models
5466-1158: Simplex 48/24 HDDIO-2 Smart-Plus module intended for MicroNet Simplex applications and backward-compatible Coder 4 systems.
5466-1051: MicroNet TMR 48/24 HDDIO Smart-Plus module for newer implementations; Woodward identifies it as the preferred replacement architecture for systems using Coder 5.04 or later.
5453-276: Relay/field termination component used with the relevant MicroNet discrete I/O configuration.
Installation and Maintenance — 5466-1156
The module slides into the MicroNet chassis card guides and connects to the motherboard. Secure the card using the upper and lower retaining screws after confirming connector alignment. The applicable FTM configuration must match the wiring arrangement and cable set specified by Woodward.
Before replacement, record the existing module part number, revision, Coder version, FTM configuration, and field wiring. Pay particular attention to whether the system is operating with legacy Coder 4.06 compatibility or a newer Smart-Plus implementation. Woodward specifically distinguishes the replacement parts by Coder generation, so part-number substitution should not be made solely from physical appearance.
Personally, I would treat revision control as the first inspection point on this part. A visually identical I/O module can still be the wrong spare when the controller software generation or TMR configuration differs.
Product Warranty — 5466-1156
Warranty coverage depends on the supplier and condition of the unit, such as new, unused surplus, refurbished, or tested spare stock. Procurement records should include the exact part number, hardware revision, serial number, test status, and applicable return terms.
The WOODWARD 5466-1156 is best classified as a MicroNet TMR 48/24 HDDIO-2 Smart-Plus digital I/O spare, particularly relevant to legacy redundant control systems requiring backward-compatible discrete I/O functionality.
