Allen-Bradley 1785-BCM/C
Allen-Bradley 1785-BCM/C
Allen-Bradley 1785-BCM/C
Allen-Bradley 1785-BCM/C
Allen-Bradley 1785-BCM/C
Allen-Bradley 1785-BCM/C
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  • Lifecycle status

    Discontinued / Obsolete by OEM
    Apter Power supports exact-model sourcing and documentation review for 1785-BCM/C backup systems.

1785-BCM/C

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Allen-Bradley 1785-BCM/C is a Series C PLC-5 backup communication module for an installed primary and secondary controller arrangement.
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Technical specifications for 1785-BCM/C

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1785-BCM/C
  • Product Family:
    PLC-5
  • Product Type:
    PLC-5 Backup Communication Module
  • Stock:
    1
  • Module series:
    C
  • System family:
    PLC-5 backup
  • Module role:
    Backup communication
  • Installed arrangement:
    Primary and secondary controller pair
  • Order identity:
    1785-BCM/C
  • Pairing review:
    Compare installed rack records
  • Separate accessory:
    1785-BEM backup expansion
  • Revision evidence:
    Use the removed-module label
  • Weight:
    0.56 kg
  • Estimated shipping dimensions:
    3.2x14.6x26cm
  • Tariff Code:
    8517795000
  • Country of origin:
    USA
  • Place of shipment:
    Xiamen, Fujian, China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Selection Installation Service Checks Applications

Features:

  • PLC-5 backup module: intended for controller redundancy arrangements.
  • Series C identity: the /C suffix identifies the replacement revision.
  • Installed-system fit: review the primary and secondary chassis records together.
1785-BCM/C is used in a PLC-5 backup arrangement where the existing controller pair and communication layout determine the spare-part requirement.

The Series C suffix matters: a similarly named 1785-BCM/A or 1785-BEM is not automatically an interchangeable replacement.

Before sourcing 1785-BCM/C, record the removed module label, rack position, companion controller, and installed firmware and wiring documentation.

Apter Power supports document review and exact-revision sourcing for the Allen-Bradley 1785-BCM/C PLC-5 backup module.
Allen-Bradley 1785-BCM/C PLC-5 Backup Communication Module Manuals,Datasheets,Link Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
  • Confirm the full 1785-BCM/C label, including the Series C suffix.
  • Identify the existing primary and secondary PLC-5 chassis before selecting a spare.
  • Compare the removed board revision and companion controller records; a family match alone does not establish interchangeability.
  • Capture the installed 1785-BCM/C slot, cable paths, and module markings before removal.
  • Use the site-approved PLC-5 backup procedure and the documentation for the installed revision.
  • Keep a rollback record for the original module and its settings during service.
  • If backup communication is unavailable, first compare the 1785-BCM/C status indicators with the site fault log.
  • Check whether the issue follows one module, one chassis, or a changed communication path.
  • Escalate ambiguous revision or pair behavior to a qualified PLC-5 service specialist before substituting hardware.
  • Spare-part support for an installed PLC-5 primary and secondary controller pair.
  • Maintenance of a legacy backup system where the Series C module identity is documented.
  • Revision-specific replacement planning during a PLC-5 lifecycle or migration project.
Description
1785-BCM/C is an Allen-Bradley PLC-5 backup communication module identified by its Series C suffix. It belongs to a legacy controller-redundancy arrangement, so the installed pair and its system documentation matter more than a family-level part match.

For a 1785-BCM/C replacement, record the original module marking, rack position, companion controller, cable connections, and revision information before comparing stock. The related 1785-BEM expansion module and other BCM series are separate identities and should not be treated as automatic substitutes.

Because 1785-BCM/C is discontinued, plan availability and any migration in the context of the complete PLC-5 backup system. A qualified controls specialist should validate the approved configuration and site procedure before returning the installation to service.
Alternative Names
1785 BCM/C 1785-BCM-C 1785BCMC
Technical notes
1785-BCM/C is identified by its /C suffix. The linked three-page document is a Series C reference excerpt from Rockwell's 1785-BCM family manual; the source pages use "1785-BCM Series C", not the full slash-suffix catalog string. Match the installed label, paired-controller records and site-approved configuration before applying switch or compatibility guidance. Series B settings are not evidence for Series C.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
Why is the /C suffix important when replacing 1785-BCM/C?
It identifies Series C. Match the removed label and the installed primary/secondary rack documentation; a 1785-BCM/A, 1785-BCM/B or 1785-BEM listing is not proof of interchangeability.
Is 1785-BEM another name for 1785-BCM/C?
No. 1785-BEM is a separate backup expansion module. Check the required rack position and the original part label before ordering either item.
What should be recorded before removing a 1785-BCM/C?
Photograph the complete label, status indicators, rack slot and cable terminations, then save the associated primary/secondary controller records under the site change procedure.
Our 1785-BCM/C backup pair no longer communicates. What should I compare first?
Compare each module indication with the site fault log and check whether a recent cable, rack or configuration change preceded the issue. Escalate the findings to a qualified PLC-5 specialist; a spare module alone may not resolve a system-level fault.
Does a Series B manual establish Series C switch settings for 1785-BCM/C?
No. A family manual focused on Series B is background reference only. Obtain documentation for the installed Series C revision before applying any switch or compatibility instructions.
How should 1785-BCM/C be scoped for a modernization project?
Inventory both controllers, backup modules, communication paths and application records. Assess the complete redundancy function with the migration engineer rather than replacing only the 1785-BCM/C by part number.

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