Allen‑Bradley 1756-ENBTA – ControlLogix EtherNet/IP Bridge (commonly the ENBT Series A variant) for PLC Networking

The A‑B 1756-ENBTA is an EtherNet/IP communication bridge for ControlLogix racks. In practical terms, it links your 1756 backplane to plant Ethernet for I/O, HMI/SCADA, and peer controllers. From my experience, the “ENBTA” designation typically corresponds to the 1756‑ENBT Series A hardware, which many plants still run reliably day in and day out. You might notice the straightforward single‑port layout and clear status LEDs—addressing via BootP/DHCP or a static IP is fast, and health checks are pretty predictable during short outage windows.

Company’s Order Placement Process and Guarantees

• Warranty period: 365 days
• Delivery time: 1 week for in‑stock; no more than one month at the latest
• Payment method: 50% advance payment, full payment for delivery
• Express delivery methods: FedEx, UPS, DHL
• Pre‑shipment: visual/label verification, port integrity check; ESD‑safe, shock‑resistant packing

Key Features

• EtherNet/IP backplane bridge – Connects ControlLogix controllers and I/O to standard Ethernet networks for I/O, HMI, and peer messaging.
• 10/100 Mbps single port – Simple RJ‑45 copper connection that plays well with managed switches.
• Predictable commissioning – Static IP or BootP/DHCP addressing; built‑in status LEDs and web diagnostics on typical builds.
• Producer/consumer data model – Supports implicit I/O connections and RPIs for steady update rates.
• Drop‑in maintenance – In most cases, a straight swap in a 1756 slot with minimal cabinet changes.

Technical Specifications

Application Fields

This model shows up wherever stable EtherNet/IP connectivity is the aim and a straightforward single‑port bridge is enough:

• Remote EtherNet/IP I/O islands on packaging, material handling, and OEM skids.
• HMI/SCADA links to ControlLogix controllers across segmented control networks.
• Drive communications and MCC panels where 10/100 performance is sufficient.
• Brownfield replacements for legacy bridges with minimal cabinet rework.

A controls tech told me recently, “We set the IP with BootP, mapped the I/O path, and the connections went green in one pass.” That’s been typical when switches are set up with IGMP Snooping and the cabling is tidy.

Advantages & Value

• Reliability – Proven 24/7 duty with clear LEDs and simple troubleshooting.
• Compatibility – Native to ControlLogix; works with standard managed switches and EtherNet/IP devices.
• Cost control – Keeps installed systems productive without a cabinet redesign.
• Maintainability – Familiar Logix workflows and web diagnostics cut outage time.
• Scalability – A common spare you can standardize across multiple panels.

Installation & Maintenance

• Networking: Use managed switches with IGMP Snooping/Querier for multicast; segregate control VLANs to keep jitter low.
• Cabling: Shielded CAT5e/6; keep away from VFD motor leads; maintain bend radius and proper bonding.
• Addressing: Reserve IPs; disable BootP after setting a static address; document in the panel folder.
• Firmware: Align module firmware with controller/project expectations; ControlFLASH/Studio 5000 handles updates cleanly.
• Routine care: Periodic dust removal, chassis mounting check, and a quick review of port counters and error logs.

Quality & Certifications

• Manufactured under Rockwell Automation quality systems (ISO 9001 aligned).
• CE/UL/cUL markings apply at the module/system level when installed per Rockwell guidance.
• RoHS status depends on series/lot; we can confirm by part/serial if needed.
• Warranty: 365 days repair/replace coverage from delivery.