UR-7DH | GE Multilin | Inter-Relay Communications Module

General Electric UR-7DH Inter-Relay Communications Module

The General Electric UR 7DH, also cataloged as the UR 7DH communications module, serves as the primary single‑channel inter‑relay communications module utilized to execute fiber‑optic link exchange across UR Series Universal Relay platforms. It provides a 1300 nm single‑mode LASER interface for deterministic relay‑to‑relay data transfer and channel‑health diagnostics.

Hardware Specifications

Profinet / EtherNet/IP Deterministic Networks

The UR-7DH aligns with GE industrial control conventions for deterministic communication behavior across relay networks. Although the module uses fiber‑optic LASER signaling rather than Ethernet, its internal UR backplane communication follows fixed‑cycle deterministic timing similar to GE’s Profinet/EtherNet/IP‑based control architectures. Channel‑health monitoring suppresses cross‑module latency variations, and firmware flash compatibility across UR relay families ensures stable communication without requiring protocol‑layer adjustments.

Frequently Asked Questions

Q: Can the UR‑7DH be hot‑swapped in a UR chassis? A: No. Inter‑relay communication modules require the relay to be de‑energized before insertion or removal to maintain optical interface integrity and prevent backplane communication faults.

Q: Does the UR‑7DH support dual‑channel communication? A: No. The 7D order option provides a single LASER channel only. Other type‑7 modules may include dual channels.

Q: Is the chassis shape standard across UR modules? A: The UR‑7DH uses a modified chassis with a clipped corner, which differs from the standard rectangular profile used by other UR modules.

Field Installation Guidelines

• Maintain minimum bend radius for single‑mode fiber to avoid attenuation on the 1300 nm LASER channel.
• Ensure Tx1 and Rx1 ports are correctly aligned with the corresponding remote relay ports.
• Clean fiber connectors before installation to prevent signal degradation.
• Avoid routing fiber cables near high‑voltage conductors to minimize mechanical stress and accidental damage.
• Verify module seating by applying uniform pressure across the connector edge before energizing the relay.