Allen‑Bradley 1785-CHBM PLC-5 Hot Backup Memory Cartridge

The Allen‑Bradley 1785-CHBM is a dedicated hot backup memory cartridge designed for PLC-5 ControlNet processors. It delivers non-volatile memory storage to synchronize control logic and runtime data between primary and standby PLC-5 controllers, forming the core component of PLC-5 redundant hot backup control systems.

This memory cartridge supports configurable write protection via on-board jumper settings, and works together with 1785-BCM backup communication module to realize seamless controller failover. Widely supplied as spare parts for maintenance and upgrading of critical PLC-5 redundant automation systems in process industries.

Main Specifications

• Brand: Allen‑Bradley (Rockwell Automation)
• Model: 1785-CHBM
• Product Type: PLC-5 Hot Backup Memory Cartridge
• Memory Capacity: 100K words non-volatile EEPROM memory
• Compatible Processors: 1785-L20C15, 1785-L40C15, 1785-L80C15
• Write protection function controlled by built-in jumper
• Supporting module: 1785-BCM backup communication module
• Operating Temperature Range: 0°C ~ +60°C
• Storage Temperature: -40°C ~ +85°C
• Direct plug-in installation on PLC-5 ControlNet processor

Core Functions

• Real-time mirroring of control programs and process data between primary and standby PLC-5 processors
• Maintain complete runtime data for standby controller to achieve rapid, bumpless failover
• Physical jumper enables write protection to prevent accidental program modification
• Cooperate with 1785-BCM to build complete PLC-5 redundant hot backup architecture
• Non-volatile memory retains data reliably after power loss without continuous power supply
• Standard plug-in design for quick installation and replacement on matching PLC-5 CPU
• Ensure consistent program version between dual controllers for stable redundant operation
• Reduce production downtime risk caused by main controller hardware failure
• Industrial-grade hardware adapts to long-term continuous operation in control cabinets
• Support online redundant system debugging, testing and routine maintenance operations

Application Scenarios

• Petrochemical continuous production process redundant control systems
• Power plant auxiliary equipment sequential control redundant monitoring racks
• Water treatment plant large-scale uninterrupted process control platforms
• Oil & gas pipeline and compressor station safety control systems
• Pulp & paper factory continuous production line PLC redundant control units
• Metallurgical industry furnace body and rolling equipment critical control systems
• Chemical reactor safety interlock uninterrupted automation control racks
• Port bulk material handling equipment redundant monitoring control systems
• Renovation and spare parts support of legacy PLC-5 redundant ControlNet platforms
• PLC-5 redundant system memory cartridge maintenance and replacement projects