ProSoft AN-X2-AB-DHRIO Industrial Gateway – AN-X2 Series

ProSoft AN-X2-AB-DHRIO: Deterministic Protocol Translation Between EtherNet/IP and Allen-Bradley Legacy Networks

The AN-X2-AB-DHRIO is a standalone, DIN-rail-mounted protocol gateway engineered by ProSoft Technology to bridge EtherNet/IP infrastructure with Allen-Bradley Data Highway Plus (DH+) and Remote I/O (RIO) networks. In industrial control architectures where PLC-5 and SLC 500 controllers remain embedded in production-critical loops, this module provides a non-invasive integration path — preserving existing field wiring, node addressing, and ladder logic while exposing DH+ and RIO data to modern Ethernet-based supervisory systems.

Unlike software-based OPC bridges or PC-resident communication cards, the AN-X2-AB-DHRIO operates as an autonomous embedded device. It maintains its own DH+ node address, manages token-passing arbitration independently, and presents all connected DH+ nodes as EtherNet/IP targets to upstream Logix controllers, SCADA servers, and historian platforms. This architectural separation eliminates the single-point-of-failure risk inherent in PC-dependent communication solutions.

The module simultaneously supports both DH+ and RIO on discrete physical ports, enabling a single gateway to serve mixed-network panels without additional hardware. RIO scanner functionality allows the AN-X2-AB-DHRIO to act as a 1771-ASB equivalent, reading discrete and analog I/O data from legacy RIO racks and mapping that data into EtherNet/IP assembly objects accessible via standard MSG instructions from ControlLogix or CompactLogix processors.

Configuration is performed entirely through a built-in HTTP server — no proprietary software license, no dongle, no recurring subscription. The AnxInit utility provides network discovery and firmware management over standard UDP broadcast. Firmware updates are delivered via TFTP over Ethernet, allowing remote maintenance without physical access to the panel.

Typical deployment environments include automotive assembly lines bridging PLC-5 controllers to MES systems, oil and gas facilities integrating RIO racks into DCS historians, food and beverage plants enabling remote recipe management over Ethernet while preserving DH+ wiring, and water treatment facilities connecting aging RIO I/O drops to centralized SCADA. In each case, the AN-X2-AB-DHRIO eliminates the capital expenditure of full PLC replacement while delivering Ethernet-level visibility and data accessibility.

The AN-X2 platform carries CE marking under EMC Directive 2014/30/EU, UL 508 listing for industrial control equipment, and RoHS compliance. Operating temperature range of 0 °C to +60 °C covers standard industrial enclosure environments without forced cooling.

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Technical Parameters

Hardware Logical Analysis

The AN-X2-AB-DHRIO is built on a dual-processor architecture: a dedicated communications processor handles DH+ token-passing and RIO scanner timing independently from the application processor managing EtherNet/IP stack operations. This separation ensures that latency events on the Ethernet side — such as TCP retransmissions or ARP resolution delays — do not propagate into the DH+ token-passing cycle, preserving the deterministic timing that DH+ networks require for reliable PLC-to-PLC messaging.

DH+ Token-Pass Arbitration: The module participates in the DH+ token-passing protocol as a standard network node. It monitors the token-pass sequence, acquires the token when addressed, and transmits queued EtherNet/IP-originated messages within the DH+ frame window. The internal message queue is managed with priority arbitration to prevent token-hold timeout violations, which would otherwise cause network-wide communication faults.

RIO Scanner Timing Engine: In RIO scanner mode, the module generates the RIO block transfer timing signal at the configured baud rate. I/O data is mapped into internal dual-port RAM, allowing the EtherNet/IP assembly object to read consistent I/O snapshots without race conditions between the RIO scan cycle and EtherNet/IP polling intervals. This dual-port RAM architecture is the same design principle used in Rockwell’s 1771-ASB adapter, ensuring behavioral compatibility.

EMC Design: The PCB layout employs ground plane segmentation between the Ethernet magnetics, the DH+/RIO line drivers, and the power supply section. Opto-isolation on the DH+ and RIO ports provides galvanic separation rated to withstand common-mode transients typical of industrial cable runs — particularly relevant in facilities where DH+ cabling shares conduit with motor drive power wiring. The Ethernet port incorporates integrated magnetics with common-mode choke filtering, meeting EN 55032 Class A radiated and conducted emission limits.

Watchdog and Fault Recovery: An independent hardware watchdog timer monitors both processor cores. If either core fails to service the watchdog within the configured interval, the module executes a controlled reset, re-initializes both communication stacks, and resumes operation — typically within 3–5 seconds. This autonomous recovery behavior is critical in unmanned remote installations where manual intervention is not feasible.

System Integration Benefits

• Zero PLC program modification required: The gateway presents itself as a standard DH+ node; existing ladder logic MSG instructions and PLC-to-PLC communication blocks continue to execute without alteration.
• Concurrent dual-network operation: DH+ and RIO ports operate simultaneously on independent timing engines, eliminating the need for two separate gateway devices in mixed-network panels.
• Native EtherNet/IP CIP compliance: Upstream Logix controllers address DH+ nodes via standard MSG instructions using the AN-X2 as a routing bridge — no custom function blocks or add-on instructions required.
• SCADA and historian transparency: EtherNet/IP-capable SCADA platforms (Ignition, FactoryTalk View SE, Wonderware) and historians (OSIsoft PI, FactoryTalk Historian) can poll DH+ node data directly through the gateway’s EtherNet/IP interface.
• Web-based diagnostics: The built-in HTTP server exposes real-time DH+ token statistics, RIO scan cycle counters, error frame counts, and node activity maps — accessible from any browser on the plant LAN without installing software.
• Phased modernization support: Allows facilities to deploy Ethernet infrastructure and modern supervisory systems incrementally, deferring PLC hardware replacement until budget and maintenance windows permit.
• Reduced panel footprint: Single DIN-rail module replaces PC-resident communication cards, eliminating the industrial PC, its power supply, and associated cooling requirements from the panel BOM.
• Firmware field-upgradeable: ProSoft releases firmware updates addressing protocol edge cases and adding compatibility with new Logix firmware revisions; updates are applied over Ethernet via TFTP without hardware removal.
• RSLinx Classic compatibility: The AN-X2 Ethernet driver for RSLinx Classic allows RSLogix 5/500 programming software to browse and program DH+ nodes over Ethernet, replacing 1784-KTX and 1784-PKTX ISA/PCI cards in engineering workstations.
• No recurring licensing cost: All gateway functionality is resident in firmware; no software subscription, seat license, or annual maintenance fee applies to the hardware gateway itself.

Quality Assurance & Global Logistics

Every AN-X2-AB-DHRIO unit offered through siemensplc.com is sourced from verified supply channels and subjected to a structured intake inspection process before being listed for sale. Inspection steps include visual examination of housing, label, and connector integrity; firmware version verification against ProSoft Technology’s published release history; functional power-on test with Ethernet link establishment confirmation; and anti-static packaging with humidity indicator card for transit protection.

Units with unverifiable provenance, missing manufacturer labels, or firmware versions inconsistent with production release records are not offered for sale. Traceability documentation is available upon request for customers operating under regulated quality management systems (ISO 9001, IATF 16949, FDA 21 CFR Part 11).

Shipments originate from Xiamen, China. Xiamen is a designated free-trade port with direct access to major international freight carriers including DHL Express, FedEx International Priority, UPS Worldwide Expedited, and SF International. Standard export documentation — commercial invoice, packing list, and HS code declaration (HS 8537.10) — is prepared for every international shipment. For customers requiring expedited customs clearance, pre-shipment documentation packages are available upon request.

Typical transit times: 3–5 business days to Southeast Asia and East Asia; 5–8 business days to Europe and the Middle East; 5–10 business days to North America and South America. Volume orders and project-based procurement are accommodated with consolidated shipment options to reduce per-unit freight cost.

Contact Information

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