Product Overview

The A-B 1747-DCM is a versatile data communication module engineered exclusively for Allen-Bradley’s SLC 500 programmable logic controller (PLC) series— a staple in discrete manufacturing, material handling, and process control applications. Designed to act as a communication bridge between SLC 500 PLCs and external devices (e.g., HMI panels, barcode scanners, remote I/O modules, or enterprise-level software), the A-B 1747-DCM enables reliable data exchange to streamline industrial operations. Key features include multi-protocol support, flexible port configuration, rugged industrial design, and seamless integration with the SLC 500 ecosystem—making the A-B 1747-DCM indispensable for applications where consistent communication between PLCs and peripheral systems is critical, such as automotive assembly lines, packaging facilities, and food processing plants. With compliance to global industrial standards (e.g., IEEE 802.3 for Ethernet, RS-232/485 for serial communication) and a design that withstands harsh manufacturing environments, the A-B 1747-DCM ensures uninterrupted data flow, reduces operational bottlenecks, and enhances overall system visibility.

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Technical Specifications

Parameter	Value
Product Model	A-B 1747-DCM
Manufacturer	Allen-Bradley (A-B, a Rockwell Automation brand)
Product Type	Data Communication Module (for SLC 500 PLC Series)
Communication Ports	1 x 10/100 Mbps Ethernet port (RJ45); 2 x serial ports (RS-232/485, configurable)
Supported Protocols	Ethernet/IP, Modbus TCP (Ethernet port); DF1, Modbus RTU, ASCII (serial ports)
Data Transfer Rate	Up to 100 Mbps (Ethernet); Up to 115.2 kbps (serial ports)
Operating Temperature Range	0°C to +60°C (32°F to +140°F)
Power Requirements	5V DC (from SLC 500 backplane), 0.8A max current
Mounting Type	SLC 500 PLC rack-mounted (compatible with 1746 I/O racks)
Isolation	Ethernet port: 1500V DC (line-to-ground); Serial ports: 250V DC (line-to-ground)
Compatibility	Allen-Bradley SLC 5/01, SLC 5/02, SLC 5/03, SLC 5/04, SLC 5/05 PLCs

Key Features and Benefits

Multi-Protocol Support for Flexible Device Integration

The A-B 1747-DCM supports a diverse set of industrial communication protocols across its Ethernet and serial ports, eliminating compatibility barriers between SLC 500 PLCs and external systems. Its Ethernet port handles Ethernet/IP (Allen-Bradley’s native protocol for real-time control) and Modbus TCP (for connecting to third-party devices like SCADA systems), while its two serial ports (configurable as RS-232 or RS-485) support DF1 (for A-B HMI integration), Modbus RTU (for legacy sensors), and ASCII (for barcode scanners or printers). For example, it can transmit production data from an SLC 5/05 PLC to a FactoryTalk View HMI via Ethernet/IP, while simultaneously receiving inventory data from a barcode scanner via RS-232. This versatility reduces the need for additional communication gateways, simplifying system architecture and lowering integration costs.

Seamless SLC 500 Ecosystem Integration

As a native Allen-Bradley module, the A-B 1747-DCM integrates seamlessly with the SLC 500 PLC series—requiring no external power (it draws 5V DC directly from the SLC 500 backplane) and minimal configuration via Rockwell’s RSLogix 500 programming software. Engineers can quickly map PLC data tags to communication protocols, monitor port status, and troubleshoot issues through a user-friendly interface, reducing setup time. Additionally, the module leverages the SLC 500’s backplane for fast data transfer between the PLC CPU and communication ports, ensuring that control signals and sensor data are transmitted with low latency—critical for time-sensitive applications like conveyor belt speed control or packaging line synchronization.

Rugged Design for Manufacturing Environments

The A-B 1747-DCM is built to withstand the harsh conditions of manufacturing facilities, including temperature fluctuations (0°C to +60°C), dust, and vibration (per IEC 60068-2-6). Its compact, rack-mounted design fits seamlessly into existing SLC 500 I/O racks, saving cabinet space, while its reinforced plastic housing and sealed connectors protect internal components from mechanical damage and environmental debris. Unlike consumer-grade communication devices, the A-B 1747-DCM also features electrical isolation (1500V DC for Ethernet, 250V DC for serial ports) to prevent damage from voltage spikes or ground loops common in industrial electrical systems—extending its service life and reducing maintenance downtime.

Enhanced System Visibility and Diagnostics

The A-B 1747-DCM includes built-in diagnostic features that provide real-time insights into communication health, such as Ethernet link status, serial port data transmission rates, and protocol error counts. These diagnostics are accessible via RSLogix 500 or Allen-Bradley’s RSLinx software, allowing operators to quickly identify and resolve issues (e.g., a disconnected Ethernet cable or a misconfigured Modbus RTU device) before they escalate into system failures. Additionally, the module supports remote monitoring via Ethernet/IP, enabling maintenance teams to check communication status from a central location—reducing the need for on-site inspections and improving troubleshooting efficiency. For example, if a serial port connected to a temperature sensor stops transmitting data, the A-B 1747-DCM can send an alert to the HMI, allowing technicians to address the issue without halting production.

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Company & Service Highlights

As a certified partner of industry leaders such as Bentley Nevada, Honeywell, and Allen-Bradley (Rockwell Automation), we provide key components for discrete manufacturing, process industries, and infrastructure. We offer a one-year warranty on the A-B 1747-DCM and all industrial control products, ensuring peace of mind for our customers. Our pre-sales team specializes in SLC 500 system integration—helping you confirm compatibility (e.g., verifying if the module works with your specific SLC 500 PLC model or third-party devices) and design communication architectures. Our after-sales service provides prompt support for installation, protocol configuration (including Ethernet/IP and Modbus RTU setup), and troubleshooting—critical for minimizing communication downtime in manufacturing facilities.

If you cannot find the model you need (e.g., other Allen-Bradley SLC 500 modules or parts from GE/TRICONEX), please contact us immediately.

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