1785-BCM

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Overview of Allen-Bradley 1785-BCM Backup Communication Module

The Allen-Bradley 1785-BCM is a backup communication module designed for the PLC-5 controller platform. It provides communication redundancy and seamless switchover capabilities between a primary and standby PLC processor. The module supports high-speed Data Highway Plus (DH+) and Remote I/O (RIO) communication via a high-speed serial link operating at speeds up to 1.2 Megabaud, ensuring reliable system performance during power failures, processor errors, or manual mode transitions.

Key Features of 1785-BCM

  • Single-slot module for installation in 1771 I/O chassis.
  • High-speed serial link (HSSL) with 1.2 Megabaud communication rate.
  • Two DH+/RIO interfaces for network redundancy and rapid switchover.
  • Internal buffer capacity supports up to 4K words for efficient data management.
  • Compatible with PLC-5 processors: -5/15 series B, -5/20, -5/25, -5/30, -5/40, and -5/60.
  • Conformal coating for protection in industrial environments.
  • Diagnosis/status LEDs provide per-channel communication state indication.
  • Requires 1771-WG wiring arm for secure wire termination.
  • Suitable for local installation; I/O modules must be installed remotely on DH+ or RIO networks.
  • Operating temperature range: 0 to 60 °C (32 to 140 °F).
  • Dimensions: 4.5 x 12.4 x 6.3 inches (115 x 317 x 160 mm).
  • Weight: Approximately 0.3 lbs (0.1 kg).

Technical Specifications

Specification Details
Module Type Backup Communications Module
Communication Interfaces 1 High-Speed Serial Link (HSSL), 2 DH+/RIO
Communication Speed 1.2 Megabaud
Compatible Processors PLC-5/15 series B, -5/20, -5/25, -5/30, -5/40, -5/60
Backplane Current Approximately 1.0 A @ 5 V DC
External Power Not required
Diagnostic LEDs 1 diagnosis/status per channel
Max Modules Per System 4
Coating Conformal coat
Typical Signal Delay (AC Off) 29 ± 8 ms
Typical Signal Delay (DC Off) 30 ± 7 ms
Dimensions 4.5 x 12.4 x 6.3 in (115 x 317 x 160 mm)
Operating Temperature 0 to 60 °C (32 to 140 °F)
Weight 0.3 lbs (0.1 kg)

Applications / Use Cases

The 1785-BCM module is used in critical industrial control systems requiring high availability and redundancy. It supports seamless switchover between PLC-5 processors in manufacturing, process control, and other automation environments, ensuring minimal downtime and reliable data handling during faults or maintenance.

1785-BCM

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Does it come with a warranty?

Yes, All products are offered wth 1-Year warranty.

What is the condition of the product?

All products sold are New & Unused.

How fast is shipping?

All products are delivered within 2-8 business days depending on our stock location.

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