Allen-Bradley 1771-NOC Industrial Network Interface Module

Product Details

1771-NOC Product Description

The Allen-Bradley 1771-NOC is a dedicated network interface module engineered for Rockwell Automation PLC-5 processor platforms, enabling high-integrity data communication across Data Highway Plus (DH+) and DH-485 network architectures. In modern smart factory environments where real-time data visibility, remote diagnostics, and seamless SCADA integration are non-negotiable, the 1771-NOC serves as a critical bridge between field-level control logic and upper-layer supervisory systems. Whether deployed in discrete manufacturing, process automation, energy management, or water treatment facilities, this module delivers the network stability and protocol compatibility that industrial engineers demand.

In a fully integrated smart factory architecture, the Allen-Bradley 1771-NOC functions as the network backbone connector for PLC-5 control systems, enabling structured data exchange across every layer of the automation hierarchy. At the field level, sensors and actuators feed real-time process signals into the PLC-5 processor via the 1771 I/O chassis. The 1771-NOC module then transmits this data upstream over the DH+ network to supervisory systems, closing the loop between physical process events and digital control decisions.

Within a typical plant network, the 1771-NOC communicates directly with Allen-Bradley PanelView HMI terminals, allowing operators to monitor live process variables, acknowledge alarms, and adjust setpoints without leaving the control room. Simultaneously, FactoryTalk View SCADA software receives continuous data streams from the PLC-5 via the DH+ link, enabling real-time trend visualization, historical data logging, and multi-site production dashboards. For facilities running mixed-generation control architectures, the 1771-NOC can coexist on the same DH+ segment as Allen-Bradley SLC 500 controllers and MicroLogix 1100 systems, providing a unified communication backbone across legacy and modern platforms.

Remote I/O expansion is another key strength of the 1771-NOC-enabled architecture. By pairing the PLC-5 processor with 1771 Remote I/O Adapter modules, engineers can extend the control network to distributed field panels, conveyor stations, and process skids without running dedicated point-to-point wiring. This topology reduces installation costs, simplifies troubleshooting, and supports modular plant expansion. When integrated with a 1756-DHRIO ControlLogix bridge module, the 1771-NOC network can be linked to newer ControlLogix platforms, enabling phased migration strategies that protect existing PLC-5 investments while introducing EtherNet/IP connectivity for upper-layer MES and ERP systems.

For energy monitoring applications, the 1771-NOC supports data aggregation from PowerMonitor 3000 energy meters and Allen-Bradley 1336 PLUS II variable frequency drives, feeding real-time kWh, power factor, and motor load data into the SCADA historian. This enables energy optimization workflows, demand response programs, and ISO 50001 compliance reporting — all driven by the network data link that the 1771-NOC provides. Edge gateway devices such as the Moxa MGate MB3180 can further extend protocol reach by bridging DH+ data to Modbus TCP or MQTT streams for cloud-based analytics platforms.

In process industries, the 1771-NOC integrates seamlessly with Allen-Bradley 1771-IFE analog input modules and 1771-OFE analog output modules installed in the same 1771 chassis, ensuring that loop control data — temperature, pressure, flow, and level — is continuously available to the SCADA layer for real-time process optimization and alarm management. The complete data chain from field sensor through PLC-5 processor, across the DH+ network via the 1771-NOC, and into the FactoryTalk Historian represents a proven, battle-tested industrial data architecture trusted in thousands of global installations.

Many industrial facilities operating PLC-5-based control systems face persistent challenges around data visibility, protocol fragmentation, and remote access limitations. The Allen-Bradley 1771-NOC directly addresses these pain points by providing a stable, high-speed DH+ network interface that eliminates communication bottlenecks between the PLC-5 processor and connected supervisory systems.

Protocol Fragmentation: Sites running mixed Rockwell platforms — PLC-5 alongside SLC 500 or ControlLogix — often struggle with incompatible communication layers. The 1771-NOC's native DH+ and DH-485 support allows these platforms to share a common network segment, reducing the need for protocol converters and simplifying network topology.

Data Silos: Without a reliable network interface, PLC-5 data remains trapped at the controller level, invisible to SCADA, MES, and ERP systems. The 1771-NOC breaks down these silos by providing a continuous, low-latency data path from the PLC-5 to FactoryTalk View, RSLinx Classic, and third-party OPC DA/UA servers.

Remote Monitoring Gaps: Facilities with geographically distributed control panels or remote pump stations benefit from the 1771-NOC's ability to maintain stable DH+ links over extended network segments, supporting remote diagnostics, parameter downloads, and alarm acknowledgment without requiring on-site personnel.

Production Transparency: By enabling real-time data flow from PLC-5 controllers to SCADA dashboards, the 1771-NOC supports OEE tracking, shift production reporting, and downtime analysis — giving plant managers the visibility they need to drive continuous improvement initiatives.

System Scalability: As production capacity grows, the 1771-NOC supports network expansion by accommodating additional nodes on the DH+ segment, allowing new HMI stations, data loggers, and remote I/O drops to be added without disrupting existing network traffic.

Q1: What communication protocols does the Allen-Bradley 1771-NOC support? The 1771-NOC supports Data Highway Plus (DH+) and DH-485 protocols, which are the native communication standards for Allen-Bradley PLC-5 and SLC 500 control systems. These protocols provide deterministic, peer-to-peer messaging suitable for real-time control and SCADA integration in industrial environments.

Q2: Is the 1771-NOC compatible with ControlLogix and newer Rockwell platforms? The 1771-NOC is designed for the 1771 I/O chassis used with PLC-5 processors. For integration with ControlLogix systems, a 1756-DHRIO bridge module can be used to link the DH+ network to the ControlLogix backplane, enabling cross-platform communication and phased migration without replacing existing PLC-5 infrastructure.

Q3: How does the 1771-NOC support remote diagnostics and network stability? The 1771-NOC maintains a continuous DH+ network link that allows RSLinx Classic and FactoryTalk Diagnostics tools to remotely monitor PLC-5 processor status, scan I/O faults, and download program updates without physical access to the controller. Network stability is ensured through the module's built-in error detection and automatic retransmission capabilities.

Q4: What warranty and quality assurance does NANKMOS provide for the 1771-NOC? All Allen-Bradley 1771-NOC modules supplied by NANKMOS are covered by a 12-Month Warranty and undergo pre-shipment functional testing to verify communication integrity, network node addressing, and chassis compatibility. In-stock units are available for immediate dispatch with full traceability documentation. For volume orders or urgent project requirements, contact [email protected] or call +86 18359268345.