Allen-Bradley 1771-DXPS Communication Gateway

Product Details

1771-DXPS Product Description

The Allen-Bradley 1771-DXPS is a high-performance industrial communication gateway engineered for the PLC-5 platform, delivering seamless Modbus and DH+ protocol bridging across complex automation architectures. In modern smart factory deployments, the 1771-DXPS serves as a critical data link node — connecting field-level devices, programmable logic controllers, remote I/O racks, HMI terminals, SCADA systems, and upper-level MES platforms into a unified, real-time data network. Its role spans the full industrial data chain: from raw signal acquisition at the sensor layer, through protocol conversion and network transmission, to real-time monitoring dashboards and remote diagnostic interfaces.

Designed for the Allen-Bradley 1771 I/O chassis, the 1771-DXPS integrates directly into PLC-5 backplane architectures, enabling bidirectional data exchange between legacy Modbus RTU/TCP devices and Data Highway Plus (DH+) networks. This makes it an essential bridge component in facilities where older field instruments — including pressure transmitters, flow meters, motor drives, and RTUs — must communicate with modern SCADA platforms such as Rockwell FactoryTalk View or third-party supervisory systems. The module eliminates data silos by providing transparent protocol translation without requiring additional middleware or external converters.

In a fully integrated smart factory data flow, the 1771-DXPS occupies the protocol conversion layer between field instrumentation and supervisory control. At the device edge, sensors such as Yokogawa EJA-series pressure transmitters and Endress+Hauser flow meters output Modbus RTU signals over RS-485 wiring. The 1771-DXPS receives these signals through its serial interface and translates them into DH+ register data readable by the Allen-Bradley PLC-5/40 or PLC-5/80 processor. This real-time data is then forwarded upstream via a 1785-KA5 DH+ to EtherNet/IP gateway, making process values available to FactoryTalk View SE SCADA stations and historian servers.

For remote I/O expansion, the 1771-DXPS works alongside 1771-ASB remote I/O adapter modules, extending the data acquisition reach to distributed field panels without additional cabling infrastructure. In drive control applications, Allen-Bradley PowerFlex 700 variable frequency drives connected via Modbus can be monitored and commanded through the 1771-DXPS, with speed references, fault codes, and energy consumption data flowing directly into the SCADA historian. Alarm events generated at the drive level are captured in real time, enabling predictive maintenance workflows and reducing unplanned downtime.

At the network layer, industrial Ethernet switches such as the Cisco IE-2000 series or Hirschmann MACH100 provide the backbone connectivity between the DH+ segment and the plant-wide EtherNet/IP network. Edge computing gateways — including the Moxa UC-8100 or Advantech WISE-5000 series — aggregate data from multiple 1771-DXPS nodes and push structured datasets to cloud-based analytics platforms or on-premise MES systems. This architecture supports full data visibility from the field device to the enterprise dashboard, enabling real-time OEE tracking, energy monitoring, and production KPI visualization without manual data collection.

For HMI integration, Rockwell PanelView Plus 7 terminals connected to the DH+ network can display live process values sourced through the 1771-DXPS, providing operators with real-time feedback on pressure, temperature, flow, and drive status. In multi-zone production environments, multiple 1771-DXPS modules can be deployed across different I/O chassis, each serving a dedicated process area, while all data converges at the SCADA server for centralized monitoring and reporting.

Many industrial facilities operating Allen-Bradley PLC-5 platforms face persistent challenges: legacy Modbus field devices cannot communicate natively with DH+ networks, creating data islands that prevent real-time visibility and remote diagnostics. The 1771-DXPS directly resolves this protocol incompatibility, enabling unified data collection across mixed-protocol environments without replacing existing field instrumentation.

In sites where production transparency is limited by disconnected subsystems, the 1771-DXPS provides the integration layer needed to consolidate data from Modbus RTU sensors, RS-485 drives, and serial RTUs into the DH+ backbone. This eliminates manual data logging, reduces operator error, and enables automated alarm tracking through SCADA. Remote diagnostic capability is significantly enhanced — maintenance engineers can access live device status, fault registers, and communication health metrics from any networked workstation, reducing on-site intervention requirements.

System scalability is another key advantage. As production lines expand, additional 1771-DXPS modules can be added to new I/O chassis without redesigning the network architecture. The module's compatibility with existing PLC-5 programming environments means integration is achieved through configuration rather than custom code development, reducing commissioning time and engineering cost. Each unit undergoes factory shipment testing to verify communication integrity, protocol mapping accuracy, and backplane compatibility before delivery.

Q1: What communication protocols does the Allen-Bradley 1771-DXPS support? The 1771-DXPS supports Modbus RTU and Modbus TCP on the serial/RS-485 side, with Data Highway Plus (DH+) on the backplane side. It provides bidirectional protocol conversion, enabling Modbus field devices to exchange data with PLC-5 processors and DH+ network nodes without additional hardware converters.

Q2: Is the 1771-DXPS compatible with modern SCADA and HMI systems? Yes. When paired with a DH+ to EtherNet/IP gateway such as the 1785-KA5, the 1771-DXPS integrates with FactoryTalk View SE, Wonderware InTouch, Ignition SCADA, and other OPC-DA/UA compatible supervisory platforms. PanelView Plus HMI terminals on the DH+ network can also access data sourced through the module directly.

Q3: How does the 1771-DXPS support remote diagnostics and network stability? The module provides register-level status reporting accessible via the PLC-5 data table, allowing SCADA systems to monitor communication health, error counts, and device response times in real time. Network stability is maintained through configurable timeout and retry parameters, ensuring reliable data transfer even in electrically noisy industrial environments.

Q4: What warranty and pre-shipment testing does the 1771-DXPS include? Every 1771-DXPS unit supplied by NANKMOS includes a 12-Month Warranty covering hardware defects and communication failures. Prior to shipment, each module undergoes functional testing including backplane communication verification, protocol mapping validation, and serial interface integrity checks to ensure reliable performance upon installation.