Product Overview
The Allen-Bradley 1756-RMC1 is a fiber optic communication cable designed for connecting ControlLogix redundancy modules. It is part of the ControlLogix series from Rockwell Automation and is essential for building a redundant controller system. This cable is the shortest available option for these modules, with a length of 1 meter (3.28 feet). It is compatible with both standard and extreme-environment modules, ensuring reliable operation in diverse industrial settings.
Technical Specifications Breakdown
Key parameters for the 1756-RMC1 are listed below for quick reference:
| Feature | Specification |
|---|---|
| Manufacturer | Rockwell Automation |
| Brand | Allen-Bradley |
| Part Number | 1756-RMC1 |
| Series | ControlLogix |
| Module Type | Fiber Optic Cable |
| Length | 3.28 feet (1 meter) |
| Wavelength | 1300 Newton Meters |
| Transmission | Less than 1000 MB-Second |
| Channels | 1 |
| Operating Temperature | 32-140 Fahrenheit (0-60 Celsius) |
| Enclosure | None |
| Wire Size | 20 AWG |
| Dimensions | 5.51 x 4.41 x 5.71 inches |
Industry Applications
This fiber optic cable is critical for high-availability control systems in industries like oil and gas, water treatment, and manufacturing. In a redundant controller setup, the 1756-RMC1 connects the primary and backup ControlLogix redundancy modules (such as the 1756-RM2 and 1756-RM2K) to ensure seamless failover. Its single-channel design supports fault tolerance on one channel, while a dual-channel system can tolerate a single fault. The operating temperature range of 0-60 degrees Celsius makes it suitable for both indoor and conditioned environments.
Installation & Setup Guidance
When installing the 1756-RMC1, connect it at the bottom of the redundancy module in a downward orientation. Remove the protective caps before connection. Because this cable contains optical fibers, avoid making sharp bends. Use the LC connector coupler to prevent bending and to simplify connection and disconnection without removing the module from the chassis. Ensure the cable path is clear of activities that could cause abrasion, cutting, or damage.
Maintenance & Reliability
Periodically inspect the 1756-RMC1 for signs of wear or damage, especially near connectors. Keep the cable away from high-traffic areas where it could be run over or abraded. The cable does not require routine calibration, but maintaining clean connections helps ensure reliable data transmission.
Compatibility & Integration
The 1756-RMC1 is designed for use with Allen-Bradley ControlLogix 1756-RM2 and 1756-RM2K redundancy modules. It is part of the 1756-RMCx cable series, which offers various lengths. This cable is compatible with both standard and extreme-environment modules. Note that redundancy modules and chassis do not ship with this cable, so it must be ordered separately.
Selection Guide & Purchasing Advice
When selecting a fiber optic cable for your ControlLogix redundant system, consider the required length. The 1756-RMC1 is the shortest option at 1 meter, ideal for close chassis mounting. For longer distances, other 1756-RMCx cables are available. SpareTechPLC offers this cable with detailed specifications to ensure compatibility. Please verify current lifecycle status and availability with SpareTechPLC before ordering.
Troubleshooting & Common Issues
If the redundant system fails to synchronize, check the fiber optic cable connection. Ensure the protective caps are removed and the cable is not sharply bent. Verify that the cable is securely attached to the module. If a fault occurs on one channel, the system may still operate, but a fault on both channels can cause unpredictable network behavior. Inspect the cable for physical damage if communication issues persist.
