Allen Bradley 1785-BCM | PLC-5 Backup Communication Module

Product Description

The Allen Bradley 1785-BCM is a backup communication module designed for the PLC-5 series. It provides redundancy and communication support for critical control applications, ensuring system reliability through dual DH+/Remote I/O interfaces and a high-speed serial link. With conformal coating for durability and UL/CSA certifications, this module is engineered for industrial environments requiring robust communication backup.

Technical Specifications

• Manufacturer: Allen Bradley

• Category: PLCs

• Product Line: PLC-5

• Part Number: 1785-BCM

• Product Type: Backup Communication Module

• Weight: 1.31 lbs (0.60 kg)

• Wiring Arm: 1771-WG

• DH+/RIO Interfaces: 2

• High-Speed Serial Link (HSSL): 1 interface, 1.2 Megabaud communication

• Compatible Processors: PLC-5/15 Series B, PLC-5/20, PLC-5/25, PLC-5/30, PLC-5/40, PLC-5/60

• Module Location: 1771 I/O chassis (local)

• Keying Locations: Between 8–10 and 34–36

• Customer Relay: 0.25 A @ 24 VDC (resistive)

• Operational Temperature: 0–60 °C (32–140 °F)

• Bus Communications: Local PCI 2.3 compliant

• LED Indicators: Diagnosis/Status per channel

• Maximum Modules Per System: 4

• Coating: Conformal coat for environmental protection

• External Power Requirement: None

• Typical AC Signal Delay (Off): 29 ± 8 ms

• Typical DC Signal Delay (Off): 30 ± 7 ms

Application Scenarios

• Provides backup communication for PLC-5 processors in critical automation systems

• Ensures redundancy in distributed control networks using DH+/RIO and HSSL

• Suitable for industrial environments requiring UL/CSA certified communication modules