1785-ENET | Allen-Bradley | Ethernet Interface Sidecar Module

The Allen-Bradley 1785-ENET, also cataloged as the 1785-ENET Communication Expansion Module, operates as a dedicated hardware component for EtherNet/IP protocol bridging within PLC 5 network platforms.

Hardware Specifications

Profinet / EtherNet/IP Deterministic Networks

The 1785-ENET module serves as an interface adapter for the PLC 5 backplane, enabling integration into EtherNet/IP deterministic networks. The module facilitates I/O density scaling by allowing the legacy PLC 5 architecture to communicate with modern Ethernet-enabled distributed I/O and peer-to-peer controllers. Network communication is governed by high-speed data transmission rates up to 100 Mbps, ensuring that tag updates and control status packets remain synchronized with the processor scan cycle. Firmware flash compatibility is managed via the controller's communication port to ensure consistent packet handling and protocol compliance within the automation architecture.

Frequently Asked Questions

Q: Is the 1785-ENET module hot-swappable on the PLC 5 backplane?

A: No, the 1785-ENET does not support Removal and Insertion Under Power (RIUP). The PLC 5 system must be powered down prior to the installation or removal of this communication sidecar module to prevent damage to the backplane pins and internal logic circuitry.

Q: Can the module be configured for redundant network topologies?

A: The 1785-ENET is primarily designed for standard star or linear topologies. It does not possess native support for advanced redundant ring protocols; network resilience in these applications must be handled by external managed industrial switches.

Field Installation Guidelines

1. Ensure the PLC 5 processor is in a de-energized state before attempting to attach the sidecar module to the chassis.
2. Align the module housing with the mounting slots on the side of the PLC 5 chassis, ensuring that the backplane connectors are correctly indexed and fully seated.
3. Secure the module using the integrated attachment hardware to prevent mechanical vibration from compromising the backplane electrical interface.
4. Utilize shielded Cat5e or Cat6 Ethernet cabling to minimize electromagnetic interference (EMI) ingress, ensuring the shield is terminated to a proper ground point at the cabinet entry.
5. Verify the Link/Activity status LEDs on the module faceplate after powering on the system to confirm proper physical layer synchronization with the network switch.