Allen-Bradley 1761-NET-DNI SLC 500 DeviceNet Interface Controller

Description

The Allen-Bradley 1761-NET-DNI is a specialized DeviceNet Interface controller engineered to seamlessly bridge DF1 serial devices—such as MicroLogix, SLC 500, and PLC-5 controllers, or MicroView operator interfaces—onto a DeviceNet industrial network. Operating as a network communications adapter, the unit translates standard DF1 point-to-point serial protocols into DeviceNet compliant messaging structures, enabling legacy or standalone controllers to participate in distributed I/O architectures and peer-to-peer control strategies.

With Series B enhancements, the 1761-NET-DNI supports both master/slave I/O messaging and direct explicit messaging initiation over DeviceNet. System configuration can be performed locally through the RS-232 serial port using the DNI Configuration Software Utility or over the network using RSNetWorx for DeviceNet software and appropriate Electronic Data Sheet (EDS) files. Incorporating advanced parameters such as Input and Output Split Points, the interface allows precise memory allocation between cyclic I/O data and explicit assembly messaging. Additionally, a dedicated DF1 Substitution Address capability allows serial operator interfaces to seamlessly query and communicate with controllers across the DeviceNet link.

Features

• DF1-to-DeviceNet Protocol Conversion: Enables DF1 serial devices, including MicroLogix and SLC 500 controllers, to integrate directly into DeviceNet industrial networks.
• Explicit Messaging Capability: Series B functionality allows the module to initiate explicit messages across DeviceNet and accept messages to explicit assemblies at any time.
• Configurable Data Split Points: Incorporates user-defined Input Split Point and Output Split Point parameters to flexibly balance memory usage between Master/Slave cyclic I/O and explicit messaging.
• Local RS-232 Configuration: Supports direct parameter configuration via the RS-232 serial port using the dedicated DNI Configuration Software Utility, eliminating the need for network interface converters during standalone setup.
• DF1 Substitution Address: Features a dedicated substitution parameter that allows DF1 devices, such as MicroView terminals, to transparently route messages to Allen-Bradley controllers across the network.
• Dynamic Operating Control: Replaces legacy Standby/Operational parameters with an I/O Scan Enable control parameter within the Electronic Data Sheet (EDS) for streamlined network management.

Applications

• PLC Network Integration: Bridges SLC 500 and MicroLogix controllers using DF1 serial ports into centralized DeviceNet control architectures.
• HMI / Operator Interface Extension: Enables serial operator terminals to access control data from remote PLCs located across a DeviceNet cable drop.
• Distributed Peer-to-Peer Messaging: Facilitates explicit messaging between standalone machine controllers on a common DeviceNet network segment.

Technical Specifications

Connections / Interfaces

Installation Guidelines

1. Pre-Installation Inspection: Unpack the 1761-NET-DNI and inspect the housing and connectors for physical damage. Verify that the hardware revision (Series B) matches project specifications.
2. Mounting: Securely mount the unit using standard DIN rail or panel mounting hardware within an enclosure rated appropriately for the operating environment.
3. Power and Grounding: Ensure proper power and shielding practices are maintained along the DeviceNet trunkline. Route signal wiring separately from high-voltage AC lines to minimize EMI.
4. Serial Connection: Connect the RS-232 communication cable between the 1761-NET-DNI serial port and the DF1 serial channel of the MicroLogix, SLC 500, or host device.
5. Network Connection: Connect the 5-conductor DeviceNet drop cable to the network connector, ensuring correct pin-out alignment for power ($V+$, $V-$), signals ($CAN\_H$, $CAN\_L$), and shield.

Configuration Guidelines

1. EDS File Installation: Ensure the correct Electronic Data Sheet (1761DNI3.EDS for FRN $\le 2.02$ or 1761DNI4.EDS for FRN $\ge 2.03$) is registered in RSNetWorx for DeviceNet.
2. Local Serial Setup: Use the DNI Configuration Software Utility (DNI_UTIL_B.EXE) via the RS-232 serial port to set node addresses, baud rates, and serial port parameters.
3. Split Point Allocation: Define the Input Split Point and Output Split Point parameters to allocate data buffer sizes between Master/Slave I/O and explicit messaging assemblies according to system requirements.
4. DF1 Substitution Address Setup: If connecting a serial HMI or MicroView, configure the DF1 Substitution Address parameter to map incoming serial requests to target controller addresses on DeviceNet.
5. Series A Migration Note: Note that Series A configuration files are not directly compatible with Series B hardware; parameters must be manually re-entered into the Series B device due to enhanced messaging architecture.