Allen-Bradley 1747-DCM
Allen-Bradley 1747-DCM
Allen-Bradley 1747-DCM
Allen-Bradley 1747-DCM
Allen-Bradley 1747-DCM
Allen-Bradley 1747-DCM
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1747-DCM

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Allen-Bradley 1747-DCM connects SLC 500 fixed or modular controllers to a supervisory Allen-Bradley programmable controller via the RIO Link.
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Technical specifications for 1747-DCM

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1747-DCM
  • Product Family:
    SLC 500
  • Product Type:
    Direct Communication Module
  • Stock:
    1
  • Communication Role:
    Remote I/O adapter for direct PLC/SLC data exchange
  • Host Controller Connection:
    SLC 500 fixed controller with expansion chassis or SLC 500 modular controller
  • RIO Interface:
    RIO Link connector
  • Compatible Scanners:
    PLC integral RIO scanner, 1771-SN, 1747-SN, and compatible RIO scanners
  • Cable:
    Belden 9463 daisy-chain cable
  • Extended Node Capability:
    Up to 32 adapters with 82 Ω termination resistors
  • Rack Sizes:
    1/4, 1/2, 3/4, or full logical rack
  • Transferred Image:
    One status word plus 1, 3, 5, or 7 data words
  • Configuration:
    Chassis address, starting I/O group, rack size, last rack, Clear On Fault, and data rate
  • Backplane Current:
    360 mA at 5 V DC
  • DCM Delay:
    Less than 10 ms
  • Operating Temperature:
    0–60 °C
  • Storage Temperature:
    −40–85 °C
  • Humidity:
    5–95% noncondensing
  • Agency Certification:
    CSA, CSA Class 1 Division 2 Groups A–D, UL, and CE when marked
  • Weight:
    0.2 kg
  • Tariff Code:
    8537101190
  • 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 Data Exchange Configuration Fault Handling Application
  • Connects SLC 500 fixed or modular controllers to a supervisory processor through the RIO Link
  • Operates as a Remote I/O adapter for configured PLC and SLC data exchange
  • Uses DIP-switch addressing, rack-size selection, data-rate settings, and FAULT/COMM diagnostics

Allen-Bradley 1747-DCM is a Direct Communication Module for distributed SLC 500 processing. It connects an SLC controller to a supervisory Allen-Bradley processor through the RIO Link.

The module occupies one SLC 500 chassis slot and presents distributed SLC data to a supervisory scanner. Configuration includes chassis address, starting I/O group, rack size, data rate, and Clear On Fault behavior.

Before replacement, preserve the chassis address, starting I/O group, rack size, data rate, RIO scanner arrangement, DIP-switch image mapping, cable, termination, and configured data tables.

Availability, condition, price, and shipping time for Allen-Bradley 1747-DCM are confirmed during quotation.

Allen-Bradley 1747-DCM Direct Communication Module Manuals, Datasheets, Links

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.

  • Transfers configured scanner-image data between supervisory PLC or SLC processors
  • Uses one status word plus 1, 3, 5, or 7 data words according to the selected rack size
  • Preserves bit positions while PLC addresses use octal notation and SLC addresses use decimal notation
  • Set chassis address and starting I/O group with the SW1 DIP-switch bank
  • Set rack size, last-rack behavior, Clear On Fault, and data rate with SW2
  • Keep the DCM image within one logical chassis boundary and match the selected scanner configuration
  • A steady red FAULT LED indicates an internal fault; a flashing FAULT LED indicates a configuration error
  • A missing COMM indication requires checks of scanner state, baud rate, RIO cable, connector, and processor chassis
  • Use Communication Error, Data Invalid, Program/Test/Fault, User Status, and Logical OR bits for diagnosis
  • Supervisory PLC-to-distributed-SLC data exchange through the RIO Link
  • SLC-to-SLC communication using configured DCM image tables
  • Distributed control applications using RIO status words to inhibit unsafe or invalid data
Description
Allen-Bradley 1747-DCM connects an SLC 500 fixed controller with expansion chassis or an SLC 500 Modular Programmable Controller to a supervisory Allen-Bradley programmable controller via the RIO Link.

The module operates as a Remote I/O adapter and exchanges configured image data and status words with the supervisory scanner.

Replacement work should preserve the physical slot, RIO scanner arrangement, DIP-switch image mapping, cable and termination, and the configured data tables.
Alternative Names
1747-DCM 1747 DCM 1747DCM Allen-Bradley 1747-DCM Rockwell Automation 1747-DCM SLC 500 1747-DCM
Technical notes
Allen-Bradley 1747-DCM requires matched RIO scanner settings, DIP-switch image mapping, Belden 9463 wiring, and validated data tables before startup.
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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.
Can Allen-Bradley 1747-DCM be installed without configuration?
No. Its behaviour depends on the DCM configuration created for the intended controller-to-controller data exchange.
Why can Allen-Bradley 1747-DCM communicate but transfer the wrong values?
Both systems can be online while data tables or word meanings differ. Compare the mapping and data definitions at each endpoint.
Which connected equipment must be identified for Allen-Bradley 1747-DCM?
Confirm both controller models, the selected communication interface, connected network equipment, and the documented DCM application before configuring or sourcing the module.
What should be archived before changing an Allen-Bradley 1747-DCM?
Archive the DCM program, controller projects, mapped addresses, interface settings, error handling, and the exact connected equipment.
How should an Allen-Bradley 1747-DCM timeout be investigated?
First compare physical link condition, configured timeout behaviour, controller state, data mapping, and the remote endpoint’s status.
Does Allen-Bradley 1747-DCM use the same configuration for every controller pair?
No. The required configuration follows the documented communication application and the controllers connected to that installation.
Why is the existing application logic important when replacing Allen-Bradley 1747-DCM?
The exchange is application-defined. Replacing hardware without restoring its configuration and associated controller logic can change data behaviour.

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