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The Allen-Bradley 1756-RM2 ControlLogix Redundancy Module is designed to provide robust controller redundancy for ControlLogix automation systems. Installed as a pair in separate chassis, these modules use fiber-optic communication with LC-type connectors and single-mode fiber cables to synchronize data between primary and backup controllers at transmission rates up to 1000 Mbps. This high-speed synchronization facilitates seamless controller switchover (typically in the order of tens of milliseconds) in the event of a fault, maintaining continuous operation of your system.
It supports key ControlLogix processors such as the Logix 5560 and 5570 series, and allows integration with communication modules like ControlNet or EtherNet/IP within the redundant architecture. The module occupies a single slot in any ControlLogix chassis and is suitable for distributed installations with redundancy links up to 10 km in length. Electrical and environmental specifications ensure reliable operation in industrial environments.
| Category | Specification |
|---|---|
| Manufacturer / Brand | Rockwell Automation / Allen-Bradley |
| Part Number | 1756-RM2 |
| Series / Module Type | ControlLogix Enhanced Redundancy Module |
| Function | Controller redundancy synchronization |
| Supported Controllers | Logix 5560 / Logix 5570 families |
| Transmission Speed | Up to 1000 Mbps |
| Switchover Time | Approx. 20 ms (typical) |
| Connector Type | LC-type fiber optic |
| Cable Type | 8.5/125 µm single-mode fiber-optic |
| Maximum Link Distance | 10 km |
| Wavelength | ~1310 nm |
| Channels | 1 (transmit/receive) |
| Power Draw | 1.16 A @ 5.1 V DC; 3.4 mA @ 24 V DC |
| Power Dissipation | Approx. 6 W |
| Operating Temp. | 0–60 °C (32–140 °F) |
| Dimensions | ~5.51 × 4.41 × 5.71 in (140 × 112 × 145 mm) |
| Mounting | Single slot; any open slot in ControlLogix chassis |
| Certifications | UL, CE, ATEX, IECEx (varies by unit) |