The Allen Bradley 1785-BCM is a Backup Communication Module designed for use with the PLC-5 series of programmable logic controllers (PLCs). This module enables high availability and redundancy in critical industrial automation applications by providing backup communication and automatic switchover in case of a primary module failure. It ensures continuous system operation, reducing downtime and enhancing reliability in complex control systems.
Technical Specifications
- Model: 1785-BCM
- Product Type: Backup Communication Module
- Compatible PLCs: PLC-5 series
- Redundancy Support: Yes, automatic switchover
- Communication Type: Remote I/O, Data Highway Plus (DH+)
- Baud Rate: 57.6, 115.2, or 230.4 kbps (selectable)
- Max Backup Nodes: Supports multiple PLC-5 controllers
- Mounting: Chassis-mounted
- Module Slot Size: Standard PLC-5 slot
- Input Voltage: Backplane-powered (5V DC)
- Operating Temperature: 0°C to 60°C (32°F to 140°F)
- Storage Temperature: -40°C to 85°C (-40°F to 185°F)
- Relative Humidity: 5% to 95% non-condensing
- Shock Resistance: 30G operational, 50G non-operational
- Certifications: UL, CE, CSA
Key Features
- Automatic Switchover: Provides seamless backup in case of a failure in the primary PLC communication module
- Remote I/O Communication: Ensures continued operation of distributed control systems
- Data Highway Plus (DH+) Support: Enables high-speed communication between PLCs and SCADA/HMI systems
- High Availability Design: Improves system uptime and reliability in mission-critical applications
- Modular Configuration: Installs directly into PLC-5 chassis without additional wiring modifications
- Selectable Baud Rates: Supports 57.6, 115.2, and 230.4 kbps for optimized performance
- Diagnostics & Status Indicators: Monitors network status and module operation for quick troubleshooting
- Backplane-Powered: Draws power from the PLC-5 chassis, eliminating the need for external power supplies
Compatible Components & Related Parts
- Allen Bradley PLC-5 Controllers – Works with PLC-5/10, PLC-5/20, PLC-5/30, PLC-5/40, and PLC-5/80 processors
- Allen Bradley 1771 I/O Modules – Ensures communication redundancy for distributed I/O systems
- Data Highway Plus (DH+) Networks – Interfaces with SCADA, HMIs, and other automation controllers
- Remote I/O (RIO) Networks – Provides high-availability communication for factory automation
- Allen Bradley 1785-ENET Ethernet Interface Module – Used for expanding connectivity to Ethernet-based control networks
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