
SLC Direct Communication Module
The Allen-Bradley 1747-DCM is a direct communication module. The module is part of Allen-Bradley's Remote I/O (RIO) series of adapters in the SLC 500 family. The application for this module is similar to that of a PLC-5. It distributes the SLC-500 processor located on the Allen-Bradley RIO Communication Link and lets them transfer data between each other. Each SLC 500 Controller can be connected to the Allen-Bradley Programmable Controller via the RIO Link, providing a distributed processing system. This DCM occupies 1 slot in any 500 SLC chassis. The Allen-Bradley 1747-DCM is an RIO adapter for a PLC processor with integral RIO scanners on the RIO Communication Link. It is also an adapter for RIO scanner.
Application Areas

- Industrial equipment interconnection and distributed control systems: In scenarios where multiple devices need to be coordinated, such as automobile manufacturing, steel processing, and chemical production lines, the 1747-DCM can be used as a communication bridge between the SLC 500 controller and distributed I/O modules, remote sensors/actuators, or third-party devices (such as inverters, PLCs).
- Data acquisition and monitoring (SCADA) in factory automation: In industries such as food and beverage, pharmaceuticals, and electronic assembly that require high real-time production data, the 1747-DCM can connect the SLC 500 controller to the SCADA system or host computer (such as HMI human-machine interface).
- Traditional system upgrade and heterogeneous network integration: In industrial environments where old factories are renovated or mixed-brand equipment is used, the 1747-DCM can be used as an interface module between the SLC 500 controller and non-Rockwell devices (such as Siemens PLCs, Mitsubishi controllers, or third-party smart meters).
Technical Specifications
| Manufacturer | Rockwell Automation |
| Module Type | Direct Communication Module (DCM) |
| Part Number/Catalog No. | 1747-DCM |
| Brand | Allen-Bradley |
| Supported Protocol: | Remote I/O (RIO) |
| Transmission rate: | 57.6K baud at 10,000 ft; 115.2K baud at cable length of 5000 feet |
| Communication cable: | Belden 9463 or any equivalent |
| Terminating resistor: | 82 Ohms; 150 Ohms |
| Compatible controllers: | SLC 500 Fixed and Modular style |
| Operation modes: | Standard and non-extended node |
| LED indicators: | FAULT; COMM |
| Backplane Current: | 360 mA @ 5VDC |
| Series | SLC 500 |
| Communication Port | Universal Remote I/O Adapter |
| Backplane Current (5 Volts) | 360 milliamps |
| Cable | Belden 9463 |
| Connectors | 6-Pin Phoenix Connector |
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