1785-BCM | Allen-Bradley Redundant PLC-5 Communication
Manufacturer: Allen Bradley
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Part Number: 1785BCM
Condition：New with Original Package
Product Type: I/O Field Wiring Arm
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Country of Origin: USA
Payment:T/T, Western Union
Shipping port: Xiamen
Warranty: 12 months
Product Description
The Allen-Bradley 1785-BCM is a Backup Communication Module designed for PLC-5 controllers to enable redundant, hot-backup processor systems. It ensures continuous operation in critical industrial processes by synchronizing data tables, system status, and diagnostics between primary and secondary PLC-5 processors. In the event of a primary controller failure, the secondary processor automatically takes over, minimizing downtime and maintaining process continuity.
This module is suitable for process industries, utilities, oil & gas, chemical plants, and any environment where high system availability and reliability are essential.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Allen-Bradley (Rockwell Automation) |
| Model | 1785-BCM |
| Product Type | Backup Communication Module |
| Platform | PLC-5 controllers |
| Primary Function | Enables redundant (hot backup) PLC-5 processor systems |
| Communication Method | High-speed backup link between two PLC-5 processors |
| Supported Processors | PLC-5/40, PLC-5/60, PLC-5/80 and compatible models |
| Synchronization Features | Data table synchronization, status exchange, diagnostics |
| Failover Behavior | Automatic switchover to backup processor on primary failure |
| Indicators | LED status indicators: LINK, ACTIVE, FAULT, BACKUP |
| Backplane Current Draw | 1.0 A at 5 VDC |
| Backup Cable Compatibility | Uses 1785-BCM backup communication cable |
| Isolation | Electrical isolation between backup link and backplane |
| Configuration | DIP switches for system setup and addressing |
| Operating Temperature | 0 °C to +60 °C |
| Storage Temperature | –40 °C to +85 °C |
| Humidity | 5–95% non-condensing |
| Dimensions | Standard PLC-5 module size (~290 × 35 × 130 mm) |
| Weight | 0.6 kg |
| Certifications | UL, cUL, CE |
| Lifecycle Status | Mature / legacy (supported for existing PLC-5 systems |