1785-BCM/B

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Overview of Allen-Bradley 1785-BCM Backup Communications Module

The Allen-Bradley 1785-BCM is a backup communications module for PLC-5 processors, designed to provide high-speed communication and system backup protection in redundant PLC configurations. It supports communication protocols including Data Highway Plus (DH+) and Remote I/O (RIO), allowing rapid switchover between primary and backup processors via a High-Speed Serial Link (HSSL) operating at 1.2 Megabaud.

Key Features of 1785-BCM

  • Single-slot module installs in a 1771 I/O chassis.
  • High-Speed Serial Link (HSSL) interface for rapid communication at 1.2 Megabaud.
  • Two DH+/Remote I/O interfaces supporting network redundancy.
  • Compatible with PLC-5 processors: 5/15 Series B, 5/20, 5/25, 5/30, 5/40, and 5/60.
  • Built-in diagnostic/status LEDs for communication channel monitoring.
  • Conformal coated for harsh industrial environments.
  • No external power required; powered from the backplane.
  • Relay output rating: 0.25A at 24 V DC, resistive load.
  • Maximum of 4 BCM modules per system.
  • Typical signal delay: 29 ± 8 ms (AC off), 30 ± 7 ms (DC off).
  • 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
Manufacturer Rockwell Automation (Allen-Bradley)
Module Type Backup Communications Module
Compatibility PLC-5/15 Series B, 5/20, 5/25, 5/30, 5/40, 5/60
Communication Interfaces 1 High-Speed Serial Link (HSSL), 2 DH+/RIO
Bus Communications Local PCI 2.3 Compliant
Diagnostic LEDs 1 per communication channel
Operating Temperature 0 to 60 °C (32 to 140 °F)
Certifications UL, CSA Industrial Control Equipment
Backplane Current Load Approx. 1 A @ 5 V DC
Power None external required (powered via backplane)
Dimensions (HxWxD) 4.5 x 12.4 x 6.3 inches (115 x 317 x 160 mm)
Weight 0.3 lbs (0.1 kg)

Applications / Use Cases

The 1785-BCM module is essential in high-availability PLC-5 control systems requiring fast failover from a primary to a backup processor to maintain process continuity. It is widely used in critical manufacturing, process control, and material handling applications demanding redundant control and reliable communication.

1785-BCM/B

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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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