Woodward | 5441-693 | MicroNet High-Density Discrete I/O Module

Product Description

The Woodward 5441-693 Rev D is a High-Density Discrete I/O Field Termination Module (FTM) designed for Woodward MicroNet and compatible turbine control systems.

The module provides 24 discrete input connections and 12 SPDT relay outputs for interfacing with external switches, status contacts, alarms, and control circuits. It works with the Woodward 48/24 Discrete Combo Module and connects through a dedicated MicroNet high-density analog/discrete cable.

The 5441-693 includes an I/O lockout relay that can de-energize the output relays when the associated I/O lock signal is deactivated. Removable field connectors and replaceable relays simplify inspection and maintenance.

Typical applications include steam turbine control, generator protection, industrial process control, and other systems requiring multiple discrete signal interfaces.

Product Datasheet & Parameters

• Brand: Woodward
• Model: 5441-693
• Revision: Rev D (verify the installed revision marking)
• Series: MicroNet
• Product Name: High-Density Discrete I/O Field Termination Module
• Product Type: Discrete I/O Field Termination Module
• Discrete Inputs: 24 connections
• Relay Outputs: 12 SPDT relay outputs
• Input Type: Discrete contact inputs
• Contact Supply: Isolated 24 VDC, maximum 400 mA
• Input Update Time: Approximately 5 ms
• Time-Stamping Resolution: 1 ms, where supported by the configured system
• Output Type: Electromechanical SPDT relay
• Relay Output Ratings:
  • 28 VDC resistive: 10 A
  • 150 VDC resistive: 3 A
  • 115 VAC resistive: 10 A
  • 240 VAC resistive: 10 A
  • 28 VDC inductive: 3 A
  • 150 VDC inductive: 1.2 A
  • 115 VAC inductive: 6 A
  • 240 VAC inductive: 3 A
• System Compatibility: Woodward MicroNet and compatible 48/24 Discrete Combo Module configurations
• Connection: MicroNet high-density analog/discrete cable
• Installation: Field termination / control cabinet mounting
• Hazardous-Area Use: Ordinary, non-hazardous locations only
• Place of Manufacture: Verify from the product label
• Dimensions: Confirm from the physical unit and installation documentation
• Weight: Confirm from the physical unit
• Product Condition: Used listing; inspect the actual unit before purchase
• Discontinued Status: Confirm current availability with Woodward or an authorized supplier

 

Main Product Features

• 24 discrete input connections for external status and contact signals.
• 12 SPDT relay outputs for switching external control circuits.
• Designed for integration with the Woodward 48/24 Discrete Combo Module.
• Supports two relay modules connected to one compatible Discrete Combo Module.
• I/O lockout relay provides a means to de-energize output relays through the system lock signal.
• Removable field connectors simplify wiring inspection and module replacement.
• Field-replaceable relays help reduce maintenance work.
• High-density cabling supports organized connections within MicroNet control cabinets.

 

Daily Maintenance and Care

1. Visual Inspection
   Check the module housing, connectors, relay compartments, and wiring terminals for physical damage, corrosion, or discoloration.
2. Input Signal Inspection
   Verify that all 24 discrete input connections respond correctly to their associated field contacts.
3. Relay Output Testing
   Check the switching operation of each relay under an approved test procedure. Compare actual contact behavior with the control logic.
4. Contact and Wiring Inspection
   Inspect removable connectors for loose terminals, oxidation, damaged insulation, and incorrect wiring.
5. I/O Lockout Verification
   Test the I/O lock signal under an approved maintenance procedure and confirm that the output relays respond as designed.
6. Cable Inspection
   Check the high-density cable and its connectors for secure seating, damaged pins, or excessive bending.
7. Cabinet Environment
   Keep the control cabinet clean, dry, and within the environmental limits specified for the installed MicroNet system.

 

Troubleshooting and Common Problems

Problem: Discrete Inputs Do Not Change State

• Check the external contact and field wiring.
• Verify the 24 VDC contact supply.
• Inspect the removable input connector.
• Check the associated Discrete Combo Module and high-density cable.

Problem: Relay Output Does Not Switch

• Verify the output command from the controller.
• Check the I/O lock signal and lockout relay status.
• Inspect the individual relay and its contact terminals.
• Confirm that the connected load is within the relay rating.

Problem: Intermittent Input Signals

• Inspect field wiring for loose connections.
• Check for electrical interference or grounding problems.
• Verify the contact supply and cable connections.
• Inspect the associated input circuitry.

Problem: Multiple Relay Outputs De-Energized

• Check the I/O lock signal.
• Verify the control system’s shutdown or interlock logic.
• Inspect the lockout relay and its associated wiring.
• Confirm that the controller and Discrete Combo Module are operating correctly.

Problem: Communication or I/O Recognition Failure

• Check the high-density cable connection.
• Verify that the 5441-693 is installed with the correct compatible hardware.
• Inspect the associated MicroNet module and system configuration.
• Check for damaged connectors or incorrect module installation.

 

Installation and Safety Precautions

• Confirm that the complete part number and revision match the installed system requirements.
• Use the 5441-693 only with its specified compatible Discrete Combo Module and cabling.
• Install the module in an ordinary, non-hazardous location.
• Disconnect power and follow the approved isolation procedure before wiring or replacing relays.
• Never exceed the specified relay contact ratings.
• Select relay ratings according to the actual resistive or inductive load.
• Use suitable suppression components where required for inductive loads.
• Verify terminal assignments against the applicable wiring documentation.
• Perform functional testing before returning the turbine or control system to service.
• Do not rely on this module alone for safety-critical shutdown protection.

 

Frequently Asked Questions

Q1: What is the function of Woodward 5441-693?

A: It is a high-density discrete I/O field termination module that provides 24 discrete input connections and 12 SPDT relay outputs.

Q2: Is 5441-693 a standalone PLC CPU?

A: No. It is an FTM used with compatible Woodward MicroNet discrete I/O hardware.

Q3: Which module does 5441-693 work with?

A: It is designed to work with the Woodward 48/24 Discrete Combo Module through the specified high-density analog/discrete cable.

Q4: How many relay outputs are available?

A: The module provides 12 SPDT relay outputs.

Q5: Can the relays be replaced?

A: Yes. The relay design supports field replacement, subject to the approved maintenance procedure and compatible replacement parts.

Q6: Can 5441-693 be installed in a hazardous area?

A: The documented 24/12 discrete relay module is intended for ordinary, non-hazardous locations only.

Q7: What should be checked before ordering a replacement?

A: Verify the complete part number, revision, relay configuration, connector arrangement, cable compatibility, and installed MicroNet system configuration.

 

Recommended Woodward Models and Related Parts

1. 5466-1158 – Simplex 48/24 High-Density Discrete I/O-2 module with backward compatibility.
2. 5466-258 – Simplex Discrete I/O module for compatible MicroNet Plus configurations.
3. 5466-257 – High-Density Analog I/O module for system signal acquisition.
4. 5466-253 – Triplex Analog Combo module for redundant control applications.
5. 5466-332 – High-Density Analog I/O module.
6. 5466-316 – Analog Combo module for MicroNet control systems.
7. 5501-371 – MicroNet Simplex MPU and Analog I/O field termination module.
8. 5501-365 – Analog Combo TMR field termination module.
9. 5501-372 – High-Density Analog I/O Triplex field termination module.
10. 5453-829 – MicroNet Plus 8-slot redundant chassis with Smart Fans.
11. 5466-1035 – MicroNet CPU5200 module with PowerPC processor.
12. 5466-1000 – MicroNet Plus power supply module with 24 VDC input.
13. 5466-1001 – MicroNet Plus power supply module with 110 VAC / 125 VDC input.
14. 5466-1002 – MicroNet Plus power supply module with 220 VAC input.
15. 5417-173 – MicroNet high-density analog/discrete connection cable.

Note: These are related MicroNet components and system accessories, not all direct substitutes for 5441-693. Confirm hardware compatibility and revision requirements before ordering.