The Allen-Bradley 1440-REX03-04RG Voted EODS Relay Module, also known as the XM-442, is a component of Rockwell Automation’s XM® Series designed to provide two-out-of-three or one-out-of-three voting logic in an Electronic Overspeed Detection System (EODS). It features four high-power relays serving as the EODS alarm and shutdown mechanisms.
| Manufacturer | Rockwell Automation |
| Brand | Allen-Bradley |
| Product Type | Voted EODS Relay Module |
| Part Number | 1440-REX03-04RG |
| Inputs | Three digital inputs for communication with speed modules |
| Voltage Ranges | Supply: 24V DC; Relay: 250V AC, 50/60 Hz, 3 A resistive; 150V DC, 1.6 A resistive |
| Communication Types | Digital inputs from speed modules; no XM bus or ControlNet communication |
| Thermal Dissipation | 2.9 W (9.9 BTU/hr) maximum |
| Field Power | 24V DC, 0.2 A maximum, Class 2/SELV |
| Status Indicator | Module power (red/green), Shutdown relay (red), Alarm relay (red) |
| Input Power | 24V DC, 0.2 A maximum |
The Allen-Bradley 1440-REX03-04RG Voted EODS Relay Module, part of the XM® Series, is engineered to enhance machinery protection by implementing voting logic within an Electronic Overspeed Detection System (EODS). This module integrates with three XM-220 Dual Speed Modules to deliver API-compliant, triple-redundant overspeed detection. It features four high-power relays that function as alarm and shutdown mechanisms, ensuring reliable response to overspeed conditions.
The XM-442 module operates on a 24V DC power supply and is designed for seamless integration with the XM-946 (1440-TB-G) terminal base. It communicates with connected speed modules through three dedicated digital inputs, eliminating the need for XM bus or ControlNet communication. The module’s status indicators provide clear visual feedback, displaying module power status and the state of the shutdown and alarm relays.
In terms of environmental resilience, the XM-442 module is rated for operation within a temperature range of -20 °C to +65 °C (-4 °F to +149 °F) and is classified with a T4 temperature code, indicating its suitability for use in hazardous locations. Its compact design, measuring approximately 97 x 94 x 94 mm (3.8 x 3.7 x 3.7 inches), allows for efficient installation in various industrial settings. The module’s robust construction and compliance with industry standards make it a reliable choice for critical overspeed detection applications, contributing to enhanced safety and operational efficiency in industrial environments.