Woodhead PCU2000ETH Industrial Ethernet Card – SST Series

Woodhead PCU2000ETH – Dual-Protocol Industrial Ethernet PCI Card for Deterministic Control Networks

The Woodhead PCU2000ETH is a 32-bit PCI bus communication card designed for integration into industrial PC-based control platforms requiring simultaneous EtherNet/IP and Modbus TCP connectivity. Manufactured under the SST (Sub-System Technology) product line, this card addresses the architectural requirement of bridging legacy serial-based field devices with modern Ethernet-backbone supervisory systems. Its onboard protocol stack offloads network processing from the host CPU, preserving deterministic scan-cycle performance in time-critical control loops.

Unlike generic NIC adapters, the PCU2000ETH implements a dedicated embedded processor for protocol handling. This separation of communication processing from the host application layer eliminates jitter introduced by OS-level interrupt latency — a critical requirement in applications where control-loop cycle times fall below 10 ms. The card is compatible with both 3.3 V and 5 V PCI slots, making it deployable across a wide range of industrial panel PCs and embedded controllers without hardware modification.

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Technical Parameters

Hardware Logical Analysis

Protocol Offload Architecture: The PCU2000ETH employs a dedicated embedded microcontroller that manages the full EtherNet/IP and Modbus TCP stack independently of the host CPU. The host communicates with the card via a shared dual-port memory (DPM) region mapped into the PCI address space. This architecture means that network frame assembly, CIP object management, and Modbus register mapping are handled entirely on-card. The host application reads and writes process data to the DPM at its own scan rate without being blocked by network timing events. This decoupling is architecturally significant: in a conventional software-stack NIC implementation, a 100 ms network timeout event would stall the host thread; with the PCU2000ETH’s offload design, the host scan cycle remains unaffected.

EMC and Signal Integrity Design: The card’s PCB layout follows IPC-2221 Class B guidelines for high-frequency digital circuits. The Ethernet PHY section is isolated from the PCI bus logic by a dedicated ground plane split, reducing common-mode noise coupling between the 33 MHz PCI clock domain and the 25 MHz Ethernet reference clock. Magnetic isolation is implemented at the RJ-45 port via an integrated transformer module rated to 1,500 V isolation, providing galvanic separation between the field network and the host backplane. This isolation is particularly relevant in environments with ground potential differences between control cabinets — a common condition in large-scale process plants where cable runs exceed 50 m.

DMA Transfer Engine: PCI bus DMA is used for host-to-card and card-to-host data movement, bypassing the CPU for bulk process-image transfers. The DMA engine supports 32-bit burst transactions, achieving sustained throughput sufficient to refresh a 512-byte process image within a single PCI bus arbitration cycle. This eliminates the CPU overhead associated with programmed I/O (PIO) transfers, which is measurable in multi-card configurations where three or more communication cards share a single host.

Auto-MDI/MDIX and Link Negotiation: The integrated PHY supports automatic crossover detection, eliminating the need for crossover cables when connecting directly to a switch port or another device. 10/100 Mbps autonegotiation is handled in hardware, with link status and speed indicators available via the card’s driver API for diagnostic polling from the host application.

System Integration Benefits

• Deterministic scan-cycle preservation: Protocol offload to the onboard processor prevents network events from introducing variable latency into the host PLC or SCADA scan cycle, maintaining cycle-time consistency below ±1 ms in typical configurations.
• Dual-protocol simultaneous operation: EtherNet/IP and Modbus TCP run concurrently on a single card and single network port, reducing slot consumption in space-constrained industrial PCs and eliminating the need for a second NIC dedicated to legacy Modbus devices.
• Broad PLC ecosystem compatibility: The card’s EtherNet/IP implementation is ODVA-conformance tested, ensuring interoperability with Allen-Bradley ControlLogix, CompactLogix, and MicroLogix platforms without custom configuration. Modbus TCP compatibility extends reach to Schneider Electric Modicon, GE Fanuc, and third-party RTU gateways.
• Diagnostic transparency via CIP objects: The EtherNet/IP stack exposes standard CIP Identity Object (Class 0x01) and Connection Manager Object (Class 0x06) attributes, allowing network diagnostic tools such as RSLinx Classic and Studio 5000 Logix Designer to enumerate the card as a standard EtherNet/IP device and report connection status without proprietary software.
• Reduced host CPU load: Benchmarks on a 1 GHz embedded x86 host show CPU utilization for network management drops from approximately 18 % (software stack NIC) to under 3 % (PCU2000ETH offload), freeing host resources for HMI rendering, historian logging, and control algorithm execution.
• Galvanic isolation at the network port: The 1,500 V transformer isolation at the RJ-45 port protects the host backplane from ground loops and transient surges propagated through the Ethernet cable — a failure mode that has caused unplanned shutdowns in plants where Ethernet cables share conduit with high-voltage power wiring.
• Driver support for Windows and Linux: Woodhead SST provides WDM kernel-mode drivers for Windows 7/10/11 (32/64-bit) and kernel module support for Linux 4.x and later, enabling deployment on both legacy HMI PCs and modern embedded Linux controllers without OS migration constraints.
• Scalable multi-card configurations: Up to four PCU2000ETH cards can be installed in a single host system (subject to available PCI slots and IRQ resources), each independently managed by the driver stack. This supports architectures where separate network segments — for example, a safety network and a standard control network — must be physically isolated at the host level.

Quality Assurance & Global Logistics

Every Woodhead PCU2000ETH unit supplied through siemensplc.com is sourced from verified distribution channels and subjected to a structured incoming inspection protocol. Visual inspection covers PCB surface condition, component placement conformance, label authenticity, and serial number traceability against manufacturer records. Functional verification includes PCI bus enumeration confirmation, Ethernet link establishment at both 10 Mbps and 100 Mbps, and protocol handshake validation under controlled bench conditions. Units that do not pass all inspection stages are quarantined and not offered for sale.

Logistics operations are based in Xiamen, China, with established carrier accounts with DHL Express, FedEx International Priority, and UPS Worldwide Expedited. In-stock units are dispatched within 1–3 business days of order confirmation. Export documentation — including commercial invoice, packing list, certificate of origin, and HS code declaration (HS 8537.10) — is prepared for every shipment to facilitate customs clearance in the destination country. For orders requiring air freight to Europe, North America, or Southeast Asia, transit times of 3–7 business days are standard under normal customs conditions. All units are shipped in anti-static packaging with foam cushioning to prevent transit damage to the PCI edge connector and onboard components.

A 12-month warranty is provided from the date of invoice. Warranty coverage includes functional failure under normal operating conditions. Dead-on-arrival (DOA) units are replaced or credited within 7 business days of confirmed fault documentation. Post-sale technical support — including driver installation guidance, PCI slot compatibility consultation, and protocol configuration assistance — is provided by our engineering team at no additional charge.

Contact Information

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