1785-CHBM Rockwell Automation ControlNet Processor Backup

Availability: 20 left in stock

Product Overview The Allen-Bradley 1785-CHBM serves as an intelligent, high-availability Hot-Backup Memory Cartridge engineered exclusively for ControlNet-enabled PLC-5 programmable logic...

SKU: 1785-CHBM

Manufacturer: Allen Bradley
Product No.: 1785-CHBM
Product Type: PLC Redundancy Modules
Product Origin: USA
Payment:T/T, Western Union
Weight: 200g
Shipping port: Xiamen
Warranty: 12 months

Description Reviews

Product Overview

The Allen-Bradley 1785-CHBM serves as an intelligent, high-availability Hot-Backup Memory Cartridge engineered exclusively for ControlNet-enabled PLC-5 programmable logic controllers. This plug-in hardware card establishes a redundant control loop between two matching processors, such as the PLC-5/40C or PLC-5/80C, which operate on a unified ControlNet coaxial or fiber network. Equipped with 100 Kilowords of non-volatile EEPROM backup storage, the module mirrors active control code, data registers, and bit statuses continuously between the primary controller and a designated standby unit. If the primary processor experiences a fault or unexpected shutdown, the 1785-CHBM coordinates an automatic switchover to keep downstream field operations running without disruption. We supply this redundancy cartridge as a 100% brand new, original factory component to guarantee reliable failover timing and secure electrical trace connections.

Technical Specifications

The following technical table provides the absolute processing parameters, power consumption ratings, and physical specifications for the 1785-CHBM module:

Specification	Details
Manufacturer	Allen-Bradley / Rockwell Automation
Catalog Number	1785-CHBM (Series A)
Product Line	PLC-5 System (ControlNet Redundancy)
Condition	100% Brand New Original Factory Stock
Module Type	Hot-Backup Memory Cartridge
Backup Memory Capacity	100 Kilowords (100K EEPROM)
Redundancy Switchover Type	Hot-Backup (Primary to Secondary Transfer)
Typical Switchover Time	Less than 1.0 second
Compatible Processors	1785-L40C15, 1785-L80C15 (PLC-5/40C and PLC-5/80C)
Bus Communication Standard	Local PCI 2.3 Compliant Protocol
Primary Network Media	ControlNet Redundant Coaxial or Fiber Optic Cables
Backplane Current Draw	Up to 1.0 Amp at 5V DC (Maximum Peak Draw)
External Pilot Power	None Required (Draws current from 1771 slot bus)
Maximum Modules Per System	4 Modules
Continuous Isolation Voltage	50 Volts Continuous (ControlNet to Backplane Bus)
Diagnostic Configuration	1 Diagnostic Status Indicator Per Channel
Circuit Board Protection	Factory-Applied Conformal Coating
Operating Ambient Temperature	0 to 60 degrees C (32 to 140 degrees F)
Physical Dimensions	237.5 x 183 x 55 mm
Net Hardware Weight	0.20 kg (0.44 lbs)

Engineering Advantages

Sub-Second Bumpless Failover: The card monitors host CPU health status registers over a high-speed local PCI 2.3 compliant link. If the primary CPU drops offline, the 1785-CHBM completes a hot switchover to the secondary standby engine in less than 1 second, preserving continuous batch mixtures and turbine operations.
Non-Volatile 100K Program Guarding: An integrated 100 Kword EEPROM chip retains your complete operational program image and critical tag databases without requiring backup battery voltage. It protects the redundancy application path through complete facility blackouts or long maintenance cycles.
Corrosive Gas Protection with Conformal Coating: A factory-applied conformal layer completely seals the internal electronics against moisture, dust, and corrosive ambient atmospheric gases. This robust surface layer eliminates trace short-circuits inside harsh pulp mills, water plants, and petrochemical complexes.
Integrated 50V Galvanic Isolation: Specialized internal isolation barriers withstand a continuous 50V potential difference between the ControlNet data pathways and the main 1771 rack logic bus. This isolation intercepts heavy electrical ground loops and high-voltage inductive surges before they can damage your CPU processors.
Zero-Wiring Form Factor Installation: The compact cartridge snaps cleanly into the dedicated hardware expansion slot built into the faceplate of the ControlNet PLC-5 processor. This localized installation entirely avoids complex inter-rack synchronization cables or external terminal blocks.

FAQs

Can I utilize the 1785-CHBM hot-backup cartridge alongside standard DH+ processors like the 1785-L40B?

No. The 1785-CHBM backup cartridge works strictly with ControlNet-enabled PLC-5 processors, including the 1785-L40C15 and 1785-L80C15. Standard Data Highway Plus (DH+) processors utilize a different structural expansion slot and require different backup modules, such as the legacy 1785-CBHM cartridge.
Does this module require an independent external power supply during a main panel power failure?

No. The 1785-CHBM draws its operational 5V DC current directly through the internal pins of the primary 1771 I/O chassis backplane. It requires no external pilot power cables, which simplifies panel layout and eliminates field wiring failures.
How do onsite technicians verify that the redundancy monitoring channel is operating correctly?

The front faceplate contains dedicated diagnostic status LEDs that show real-time synchronization conditions per channel. A solid green light indicates successful cross-processor data mirroring, while an amber or red indication highlights a communication drop or a configuration mismatch between the primary and standby controllers.

What's clients say about us

Excellent Emergency Support!

Our production line was down due to a faulty Bently Nevada monitor. We found it in stock here and they shipped it via DHL immediately. Back in operation within 48 hours—truly a lifesaver for our plant.

Mark Thompson

Maintenance Manager, USA

Reliable Source for New Spares

Finding brand new, original modules is critical for our safety. This team delivers factory-fresh components with full certification. Their commitment to only selling new products makes them our most trusted partner.

Robert Hoffmann

Engineering Lead, Germany

Top-tier Service and Quality

We have sourced Honeywell and Schneider parts here for two years. Every shipment arrives well-packaged with original factory seals intact. Clear communication and the best lead times in the industry.