Allen Bradley 1785-BCM/C Backup Communication Module

Product Introduction

The Allen Bradley 1785-BCM/C Backup Communication Module is designed to provide redundant communication capability for PLC-5 control systems. Developed by Rockwell Automation under the Allen-Bradley product family, this module enables reliable processor backup and coordinated operation between primary and secondary PLC-5 controllers.

The 1785-BCM/C module supports one high-speed serial link and two DH+/RIO communication channels, allowing two PLC-5 processors to operate in a backup configuration. When the primary controller experiences a failure, the secondary controller can automatically take over control, minimizing system downtime and maintaining continuous industrial operations.

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Product Specifications

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Applications

• Redundant PLC-5 control systems, ensuring continuous operation in critical industrial processes.

• Process industries, such as chemical plants, oil and gas facilities, and power generation systems.

• Manufacturing automation, where production lines require high system availability.

• Remote I/O network coordination, allowing stable communication between controllers and distributed I/O devices.

• Control system redundancy, supporting primary and standby PLC processors.

• Legacy automation systems, maintaining reliable communication in established PLC-5 installations.

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Advantages

• Controller redundancy support, allowing seamless switching between primary and backup PLC-5 processors.

• High-speed serial communication link, ensuring fast synchronization between processors.

• Dual DH+/RIO interfaces, supporting flexible industrial network connectivity.

• Improved system reliability, reducing downtime caused by controller failures.

• Stable data synchronization, ensuring both processors maintain identical control programs and data.

• Designed for critical industrial environments, supporting long-term reliability in automation systems.

FAQ

1. What is the main function of the 1785-BCM/C module?
   It provides communication and synchronization between primary and backup PLC-5 processors in redundant control systems.

2. How many communication channels does the module provide?
   The module supports one high-speed serial link and two DH+/RIO communication interfaces.

3. What network protocols are supported?
   It supports Data Highway Plus (DH+) and Remote I/O communication networks.

4. How does the module support redundancy?
   It continuously synchronizes program and data information between two PLC-5 processors so that the backup unit can immediately take control if needed.

5. What happens when the primary PLC fails?
   The backup PLC automatically takes over control, minimizing system interruption.

6. Is the module compatible with all PLC-5 systems?
   It is designed for PLC-5 redundancy configurations where backup processor operation is required.

7. Does the module require special wiring for synchronization?
   Yes, the high-speed serial link is used to connect the primary and backup processors for real-time synchronization.

8. Can the DH+ ports be used for normal network communication?
   Yes, they allow communication with other PLCs, HMIs, and network devices.

9. Is the module suitable for critical industrial processes?
   Yes, it is commonly used in systems where continuous operation and high reliability are required.

10. Can it be used to upgrade existing PLC-5 systems?
    Yes, it can be integrated into existing PLC-5 racks to add redundancy capability.

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