The Honeywell 05701-A-0328 Triple SPCO Relay Card is an alarm output and field interface module designed for the Honeywell System 57 Gas Detection Controller. It provides Triple Single Pole Changeover (SPCO) voltage-free relay outputs for A1, A2, A3 alarm levels, fault indication, and inhibit status, allowing external PLCs, DCS systems, sirens, beacons, shutdown systems, and safety interlocks to respond automatically to hazardous gas conditions. The relay operating mode can be configured for latching or non-latching operation and normally energized or de-energized logic to meet various industrial safety requirements.

Contents

• 1. Product Overview
• 2. Main Features
• 3. Typical Applications
• 4. Installation Preparation
• 5. Relay Card Installation
• 6. Field Wiring Connections
• 7. Relay Configuration
• 8. Commissioning Procedure
• 9. Functional Verification
• 10. Preventive Maintenance
• 11. Practical Installation Case
• 12. Frequently Asked Questions

Product Overview

The Honeywell 05701-A-0328 functions as both a field interface card and an alarm relay module within the System 57 platform. Compared with the Double SPCO Relay Card, it adds an independent A3 alarm relay together with fault and inhibit outputs, enabling more advanced alarm strategies for combustible and toxic gas monitoring applications. It communicates directly with the Single Channel Control Card and provides isolated relay contacts for external equipment.

Main Features

• Triple SPCO voltage-free relay outputs
• A1, A2 and A3 alarm relays
• Dedicated Fault relay output
• Dedicated Inhibit relay output
• Selectable latching or non-latching operation
• Selectable energized or de-energized relay logic
• Field wiring interface
• Compatible with Honeywell System 57 controllers

Typical Applications

• Oil and gas production facilities
• Petrochemical plants
• Refineries
• Chemical processing facilities
• Offshore platforms
• Power generation stations
• Industrial gas detection systems
• Emergency shutdown and safety control systems

Installation Preparation

• Verify the module part number.
• Confirm compatibility with the System 57 controller.
• Disconnect controller power.
• Wear ESD protection equipment.
• Inspect connectors and relay terminals.
• Prepare field wiring according to the project drawings.
• Verify external relay load ratings.

Relay Card Installation

1. Turn off the System 57 controller.
2. Locate the designated relay card slot.
3. Align the 05701-A-0328 with the rack connector.
4. Insert the card until fully seated.
5. Secure the retaining mechanism.
6. Connect the field wiring.
7. Restore controller power.

Field Wiring Connections

• Connect the A1 alarm relay output.
• Connect the A2 alarm relay output.
• Connect the A3 alarm relay output.
• Connect the Fault relay output.
• Connect the Inhibit relay output.
• Verify protective earth and cable shielding.

Relay Configuration

• Select latching or non-latching relay operation.
• Configure normally energized or de-energized logic.
• Assign relay functions.
• Verify contact ratings.
• Check communication with the control card.
• Save configuration parameters.

Commissioning Procedure

VERIFY CARD INSTALLATION
CHECK FIELD WIRING
VERIFY POWER SUPPLY
CONFIGURE RELAY FUNCTIONS
TEST A1 OUTPUT
TEST A2 OUTPUT
TEST A3 OUTPUT
VERIFY FAULT AND INHIBIT OUTPUTS
CONFIRM NORMAL OPERATION

Functional Verification

• Verify relay switching operation.
• Test A1, A2 and A3 alarm outputs.
• Verify Fault relay activation.
• Verify Inhibit relay operation.
• Confirm communication with the control card.
• Test connected external devices.

Preventive Maintenance

• Inspect relay contacts periodically.
• Verify terminal tightness.
• Perform scheduled relay function tests.
• Inspect field wiring.
• Clean module connectors.
• Review controller alarm history.

Practical Installation Case

During the expansion of a petrochemical gas detection system, engineers installed a Honeywell 05701-A-0328 Triple SPCO Relay Card to provide separate relay outputs for A1, A2, A3 alarms, fault monitoring, and maintenance inhibit functions. After configuring the relay logic and testing each output with simulated gas alarms, the System 57 controller successfully activated the plant DCS, warning beacons, sirens, and emergency shutdown circuits according to the project requirements.

Frequently Asked Questions

What is the function of the Honeywell 05701-A-0328?

The module provides Triple SPCO voltage-free relay outputs for A1, A2, A3 alarms, fault indication, and inhibit status while serving as the field interface between gas detectors and the System 57 controller.

What is the difference between 05701-A-0327 and 05701-A-0328?

The 05701-A-0328 adds an independent A3 alarm relay together with fault and inhibit relay outputs, providing more comprehensive alarm control than the Double SPCO Relay Card.

Can the relay card be installed while the controller is powered?

No. Always disconnect system power before installing or removing the relay card to prevent equipment damage and ensure safe maintenance.

Summary

The Honeywell 05701-A-0328 Triple SPCO Relay Card provides reliable multi-level alarm relay outputs and field interface functionality for Honeywell System 57 gas detection systems. Proper installation, wiring, configuration, and commissioning ensure dependable alarm transmission and long-term industrial safety performance.