Allen-Bradley 1440-RMA00-04RC Relay Modules

Configured for discrete alarm relay outputs in XM dynamic measurement networks, the Allen-Bradley 1440-RMA00-04RC (XM-440 Master Relay Module) provides direct physical/electrical execution. The module features four independent relay outputs designed to drive control circuits and trip mechanisms based on status logic from expansion measurement modules across the backplane or local bus.

Hardware Specifications

Backplane Bus Communication & Deterministic Execution

The 1440-RMA00-04RC module utilizes deterministic backplane bus communication velocity and firmware flash compatibility within the Allen-Bradley XM-440 hardware ecosystem. High-speed serial bus links ensure microsecond-level synchronization between primary vibration or dynamic measurement modules (such as XM-120 or XM-220) and the four relay channels. The firmware execution engine processes voting logic combinations locally, enabling standalone fail-safe trip functionality without requiring constant PLC controller intervention over EtherNet/IP networks.

Frequently Asked Questions

Q: Can the 1440-RMA00-04RC module be hot-swapped while the XM terminal base is powered?

A: Hot-swapping is permitted provided the site safety guidelines for hazardous area location classes are observed. Removing the relay module under live conditions de-energizes all four relay channels, returning output contacts to their unpowered default state.

Q: How does the module handle backplane communication timeout errors?

A: If backplane bus heartbeat signals fail beyond the pre-configured threshold, the 1440-RMA00-04RC automatically executes its designated fail-safe state, opening or closing specific output contacts according to hardware jumper settings.

Field Installation Guidelines

1. Mount the XM terminal base securely onto a standard 35 mm DIN rail inside an IP54 or NEMA 12 rated enclosure. Ensure enclosure grounding bond impedance remains below 1 ohm.
2. Align the module edge connector with the terminal base guide pins and press firmly until the side locking tabs engage.
3. Wire field output circuits using shielded twisted-pair cables rated for 300 V / 105 deg C. Maintain physical separation between low-voltage signal lines and high-voltage AC relay output wiring.
4. Ground cable shields at a single point on the enclosure earth bus bar to prevent ground loops.
5. Verify NPT thread engagement (minimum 5 full thread turns) on conduit fittings and tighten wire terminal screws to specified torque limits prior to applying 24 VDC system power.