Allen-Bradley 1783-ETAP1F Network TAP – Stratix Series

Allen-Bradley 1783-ETAP1F: Passive EtherNet/IP Network TAP for Non-Intrusive Industrial Traffic Analysis

In converged industrial Ethernet architectures, the ability to capture live traffic without disturbing the control plane is not a convenience — it is an operational necessity. The Allen-Bradley 1783-ETAP1F is a hardware-level passive network tap engineered for EtherNet/IP segments operating at 10/100 Mbps over copper media. It inserts transparently into the physical layer between two inline ports, replicating the full-duplex bitstream to a dedicated monitor port with no packet injection, no MAC address participation, and no CIP connection overhead. The device draws 24V DC from the panel supply and, in the event of power interruption, maintains the inline link via a passive relay bypass — the control network remains intact regardless of tap power state.

Within Rockwell Automation’s Stratix EtherNet/IP TAP family, the 1783-ETAP1F occupies the copper-media, single-fiber-monitor position. It is the field-proven instrument of choice for maintenance engineers who need to attach a protocol analyzer — Wireshark with the EtherNet/IP dissector, FactoryTalk Network Manager, or third-party SCADA diagnostic tools — to a live segment without scheduling a maintenance window. The device is DIN-rail mounted, fits standard 35 mm rail in existing control cabinets, and is recognized natively by Studio 5000 Logix Designer and FactoryTalk Asset Centre for asset inventory purposes.

Industrial environments operating under IEC 62443, NIST SP 800-82, or ISA/IEC 62443-3-3 security frameworks increasingly mandate passive monitoring as a compensating control for network anomaly detection. The 1783-ETAP1F satisfies this requirement without introducing an active network node that itself becomes an attack surface. Its IP20 enclosure rating suits panel-mount installations in manufacturing, oil and gas, pharmaceutical, and water treatment facilities where ambient contamination is controlled at the cabinet level.

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Technical Parameters

Hardware Logical Analysis

The 1783-ETAP1F implements a split-signal passive tap topology at the physical layer. Each inline port (Port A and Port B) connects to a dedicated receive path; the transmit signal from Port A is simultaneously forwarded to Port B and copied to the monitor port’s receive channel, and vice versa. This Y-split architecture operates entirely in the analog domain for the inline path — no digital buffering, no store-and-forward latency, and no frame modification. The monitor port aggregates both directions onto a single copper output, which a connected analyzer receives as a combined half-duplex stream representing the full bidirectional conversation.

The EMC design follows IEC 61000-4 series immunity requirements. The PCB layout employs ground plane segmentation between the inline signal path and the monitor output to prevent ground loop coupling. Ferrite bead filtering on the 24V DC input suppresses conducted emissions from the panel power bus, and transient voltage suppression (TVS) diodes on all RJ45 ports provide protection against ESD events up to IEC 61000-4-2 Level 4 (±8 kV contact discharge). The relay bypass circuit uses a normally-closed (NC) contact configuration: when the coil is de-energized (power loss), the relay defaults to the closed state, maintaining the inline copper path without any active component in the signal chain.

The dual 24V DC input terminals support redundant power feeds from separate panel power supplies. The internal OR-ing diode circuit prevents back-feed between the two supplies and ensures seamless switchover with no detectable interruption to the tap’s monitor function. This architecture is consistent with SIL 2 power redundancy practices under IEC 61511 for process safety instrumentation panels.

System Integration Benefits

• Zero-latency inline path: The analog Y-split introduces no measurable propagation delay on the inline segment — CIP implicit I/O connections and motion control isochronous real-time (IRT) traffic are unaffected.
• No IP address required: The tap has no network identity; it cannot be scanned, enumerated, or targeted by network-layer attacks, satisfying defense-in-depth requirements under IEC 62443-3-3 SR 6.2.
• Native asset recognition: Studio 5000 Logix Designer and FactoryTalk Asset Centre identify the 1783-ETAP1F as a managed asset, enabling firmware revision tracking and change-log documentation without manual entry.
• Protocol-agnostic monitoring: The monitor port delivers raw Ethernet frames; any analyzer capable of 100BASE-TX capture — Wireshark, NetScout, Fluke Networks OptiView — can decode EtherNet/IP, Modbus TCP, PROFINET, or any co-resident protocol without reconfiguration.
• Deterministic diagnostic access: Because the tap never modifies the inline stream, packet captures taken at the monitor port are forensically accurate representations of the actual control traffic, suitable for root-cause analysis and regulatory audit trails (21 CFR Part 11, FDA process validation).
• Redundant power integration: Dual 24V DC inputs align with existing ControlLogix and CompactLogix panel power architectures, eliminating the need for a dedicated power supply or additional wiring infrastructure.
• Compact DIN rail form factor: At 35 mm rail width, the 1783-ETAP1F occupies minimal panel space — typically 45 mm wide — enabling retrofit installation in populated cabinets without panel redesign.
• Fail-safe bypass continuity: The NC relay bypass guarantees that a tap power failure never becomes a network outage, decoupling the diagnostic infrastructure lifecycle from the production network availability requirement.

Quality Assurance & Global Logistics

Every Allen-Bradley 1783-ETAP1F unit supplied by siemensplc.com is sourced through verified industrial automation supply channels with full traceability to authorized distribution. Each unit undergoes a structured pre-shipment inspection protocol: label authenticity verification against Rockwell Automation’s current part marking standards, physical integrity check of the RJ45 port housings and DIN rail clip mechanism, and power-on functional verification of the relay bypass and monitor port output continuity.

Shipments originate from our warehouse in Xiamen, China — a major export hub with direct access to international freight forwarders serving North America, Europe, Southeast Asia, the Middle East, and Australia. Standard export documentation accompanies every shipment: commercial invoice, packing list, certificate of origin (COO), and — upon request — a certificate of conformance referencing the Rockwell Automation product bulletin. Units are packed in anti-static bags within rigid cartons with foam inserts rated for ISTA 2A transit testing. Typical DHL Express transit times are 3–5 business days to major international destinations. Sea freight consolidation is available for bulk orders. All export classifications comply with current CN customs regulations and applicable destination-country import requirements.

Contact Information

Email: [email protected]
WhatsApp: +86 18359268345
Web: siemensplc.com
Location: Xiamen, China
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