Allen Bradley 1756-RM2K

Product Features

Allen Bradley 1756-RM2K establishes a fiber-optic communication link between two ControlLogix chassis for state synchronization and data exchange between controllers, I/O modules, and communication modules.

Allen Bradley 1756-RM2K supports dual-channel (CH1 and CH2) fiber-optic connections, allowing media redundancy through redundant fiber-optic cables and reducing the risk of system outages due to a single cable failure.

Allen Bradley 1756-RM2K has a conformal coating that passes ASTM B845-97 Method H accelerated testing (20-day exposure), complies with ANSI/ISA 71.04-2013, Level G3, and IEC 60721-3-3:2019, Level CX, and withstands corrosive gas environments (copper corrosion rate of up to 9.6 microns/year).

Allen Bradley 1756-RM2K has a built-in status indicator that visualizes the module's operating status (e.g., communication normal, faulty, etc.).

Allen Bradley 1756-RM2K can automatically check the compatibility of modules in the redundant chassis (hardware and firmware need to be the same), if there is an incompatible module, it will prevent redundancy qualification and other operations.

Allen Bradley 1756-RM2K supports hot-plugging (RIUP), but when operating in a hazardous area, it is necessary to disconnect the power or confirm the safety of the area first to avoid arcing and causing an explosion. The fiber optic port is a Class 1 laser product and should be avoided for direct visual inspection to prevent eye damage.

Product Using Principle

Allen Bradley 1756-RM2K is used in pairs, mounted in the same slot in two redundant ControlLogix chassis, and connected via fiber optic cable (e.g., 1756-RMCx series) to form a master-slave chassis data synchronization link.

Allen Bradley 1756-RM2K transmits control data, status information and configuration parameters in real time, ensuring that the controllers, I/O modules and communication modules in the master and slave chassis operate in the same state.

When the master chassis fails, Allen Bradley 1756-RM2K can trigger the switching mechanism through monitoring status, and the slave chassis seamlessly takes over the control to avoid system interruption.

Allen Bradley 1756-RM2K needs to keep the protective cover of unused ports installed to maintain the corrosion resistance level. Fiber optic cables need to be protected from severe bending, cutting or abrasion, and routed separately for dual-channel cabling to reduce the risk of simultaneous damage. Hazardous areas need to be powered off or the area needs to be confirmed safe before operation, and arcing is prohibited during hot plugging and unplugging.

Product Parameters

Below is Allen Bradley 1756-RM2K detail specification