Configured for remote I/O link transfer and data communication within industrial control loops, the Allen-Bradley 1747-DCM (1747DCM Direct Communication Module) provides direct physical/electrical execution across backplane and network interfaces.

Model Suffix Nomenclature Analysis

• 1747-DCM: Base catalog designation referencing a direct communication hardware interface built for SLC 500 remote I/O data transfers.
• 1747DCM: Alternative spare inventory part code representing identical physical communication hardware configuration without dashes.
• 1747-DCM/A: Revision identifier denoting specific hardware release iterations and firmware baseline compliance.

Hardware Specifications

Backplane Bus Communication and Network Architecture

The module regulates backplane bus communication velocity and firmware flash compatibility across connected SLC 500 rack assemblies. I/O density scaling relies on precise remote I/O link transfer mapping while maintaining deterministic network synchronization with distributed field devices. Backplane current loading demands strict adherence to system power budgets, requiring 360 milliamps at 5 Volts DC directly from the chassis bus interface to preserve operational signal integrity.

Package Ordering Information

• 1 x Allen-Bradley 1747-DCM Direct Communication Module hardware unit
• 1 x 6-Pin Phoenix Connector terminal plug assembly
• 1 x Technical documentation and jumper setting reference sheet

Physical Installation and Wiring Guidelines

• Chassis Slot Placement: Insert the communication module into any available I/O slot of the designated SLC 500 rack assembly, avoiding positions requiring high-current power supply loads.
• Remote I/O Cabling: Terminate network communication lines using Belden 9463 twinaxial cable connected securely to the 6-pin Phoenix terminal block.
• Shield Grounding: Connect the communication cable shield drain wire to earth ground at a single point to prevent ground loops and electromagnetic interference.
• Thermal Management: Maintain standard vertical air clearance inside the enclosure to support natural convection cooling across the housing surface.

Frequently Asked Questions

• Does this communication module support hot-insertion and removal under power?
  • No, inserting or removing the 1747-DCM while the chassis backplane power is active can cause electrical faults and damage internal system circuitry.
• What specific cable type is recommended for the remote I/O link?
  • The hardware is designed to operate using Belden 9463 twinaxial cable for reliable data transmission over remote distances.
• What is the exact current draw from the backplane power supply?
  • The unit draws a continuous current load of 360 milliamps at 5 Volts DC from the chassis backplane bus.
• What type of physical connector is utilized for network wiring?
  • Network connections are established using a specialized 6-pin Phoenix connector plug attached directly to the front face of the module.
• Can this module function as a remote I/O adapter in an SLC 500 system?
  • Yes, the unit facilitates direct communication link transfers allowing the SLC 500 controller to operate as a remote I/O scanner or adapter.
• Are firmware updates supported through the network communication interface?
  • Yes, firmware flash compatibility allows system updates via connected programming tools without replacing physical hardware components.
• What is the official manufacturing status of this hardware model?
  • The unit has been officially discontinued by the manufacturer, requiring reliance on legacy maintenance and spare parts inventory channels.
• How should the module be secured inside the equipment rack?
  • Fasten the integrated top and bottom retaining screws securely to the metal chassis to ensure mechanical stability and proper ground continuity.