1747-DCM

Overview of Allen-Bradley 1747-DCM Direct Communication Module

The Allen-Bradley 1747-DCM is a Direct Communication Module designed for the SLC 500 family of programmable logic controllers. It links an SLC 500 controller to expansion chassis or other SLC 500 processors over the Remote I/O (RIO) industrial network, enabling distributed processing and communication between controllers. The module supports both standard and extended node operation, allowing up to 32 adapters on the RIO link with appropriate terminating resistors.

Key Features of 1747-DCM

• Single-slot module compatible with SLC 500 fixed and modular controllers.
• Supports Remote I/O (RIO) communication protocol with baud rates up to 230.4K baud.
• Extended node capability allowing up to 32 adapters on the RIO link with 82 ohm terminating resistors.
• Two DIP switch banks with 8 switches each for configuring node address, data rate, rack size, and other settings.
• Status LEDs for FAULT and COMM (communication) indication.
• Backplane current consumption: 360 mA at 5 V DC.
• Uses Belden 9463 cable or equivalent for RIO network connections.
• Operating temperature: 0 to 60 °C (32 to 140 °F), storage temperature: -40 to 85 °C (-40 to 185 °F), humidity: 5-95% non-condensing.
• Compliance with NEMA ICS 2-230, EN 50081-2 Class A, IEC 61000-4-2, IEC 61000-4-3 standards; CSA certified.
• Removable door cover with door label, cable tie slots, and front label for easy identification and wiring management.

Technical Specifications

Applications / Use Cases

The 1747-DCM enables communication in distributed control systems using the SLC 500 family, allowing controllers to connect with expansion chassis or other processors. It is commonly used in manufacturing automation, process control, and material handling systems requiring remote I/O integration across extended distances.