WOODWARD SST-DN3-PCI-2 DeviceNet PCI Interface Card – SST Series

WOODWARD SST-DN3-PCI-2: Dual-Channel DeviceNet PCI Interface Card for Industrial PC-Based Control Systems

The WOODWARD SST-DN3-PCI-2 is a dual-channel DeviceNet communication interface card designed for integration into standard 32-bit PCI bus host computers. Operating on the CAN physical layer (ISO 11898), it provides deterministic, real-time data exchange between a PC-based controller and up to 63 DeviceNet nodes per channel — including variable-speed drives, distributed I/O blocks, smart sensors, and valve actuators. The card is a foundational component in WOODWARD governor platforms (MicroNet, NetCon) and is equally deployed in third-party DeviceNet architectures managed through RSNetWorx for DeviceNet or custom OEM software stacks.

Unlike generic CAN adapters, the SST-DN3-PCI-2 ships with a validated SST DeviceNet API that handles all MAC-layer arbitration, connection object management, and I/O polling scheduling in firmware — offloading the host CPU from protocol overhead and delivering sub-millisecond I/O cycle consistency under sustained network load.

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Technical Parameters

Hardware Logical Analysis

The SST-DN3-PCI-2 implements a dedicated on-card processor architecture that separates DeviceNet protocol execution from the host CPU. The card’s embedded controller manages all CAN frame arbitration, connection object state machines, and I/O data assembly autonomously — the host PC communicates with the card via a shared dual-port RAM (DPRAM) interface mapped into PCI address space. This architecture eliminates protocol jitter introduced by OS scheduling latency, which is a critical requirement in turbine governor and compressor control applications where I/O scan cycle deviation must remain below ±1 ms.

EMC Design: The card incorporates galvanic isolation on both DeviceNet channel transceivers, providing a minimum 500 V isolation barrier between the PCI bus ground plane and the DeviceNet network ground. This isolation prevents ground loop currents — common in large industrial panels with mixed AC/DC grounding — from corrupting CAN differential signals. The transceiver section uses a shielded layout with a dedicated ground pour, and the DeviceNet connector pinout follows the ODVA standard (V+, V−, CAN_H, CAN_L, Shield) to ensure correct termination impedance of 121 Ω per trunk end.

Dual-Channel Independence: Each of the two DeviceNet channels operates on a physically separate CAN controller and transceiver pair. There is no shared bus arbitration logic between channels — a fault condition or bus-off event on Channel 1 does not propagate to Channel 2. This hardware-level isolation is essential in redundant network topologies where one channel carries primary I/O and the second carries a backup or diagnostic network segment.

Firmware-Level Scan Scheduling: The on-card firmware implements a polled I/O scheduler that executes connection object polling at configurable intervals (1 ms to 65,535 ms per connection). The scheduler operates independently of the host OS, meaning that even under host CPU load spikes, the DeviceNet I/O cycle continues uninterrupted. This is a hardware guarantee — not a software best-effort — and is the primary reason the SST-DN3-PCI-2 is specified in safety-adjacent turbine control applications.

System Integration Benefits

• Deterministic I/O Cycle Execution: On-card firmware scheduler maintains polled I/O intervals independent of host OS load, delivering consistent sub-millisecond cycle repeatability across both channels simultaneously.
• Dual-Network Segmentation from a Single Slot: Two independent DeviceNet networks are managed from one PCI card, reducing slot consumption and simplifying cabinet wiring in space-constrained industrial PCs.
• ODVA Conformance Certification: Guarantees interoperability with all ODVA-certified DeviceNet devices — no custom configuration required when adding third-party nodes to an existing network.
• RSNetWorx for DeviceNet Compatibility: Full integration with Rockwell Automation’s network commissioning and diagnostics tool, enabling EDS-based device configuration, I/O mapping, and live network health monitoring without additional middleware.
• Galvanic Channel Isolation: 500 V isolation barrier on each channel transceiver eliminates ground loop interference, reducing unplanned communication faults in mixed-voltage industrial environments.
• Master and Slave Mode Support: Software-selectable operating mode allows the card to function as a DeviceNet scanner (master) or adapter (slave) within the same hardware platform, supporting flexible topology changes without hardware replacement.
• Validated WOODWARD Governor Integration: The SST DeviceNet API is tested against WOODWARD MicroNet and NetCon firmware, eliminating driver compatibility risk in turbine and compressor governor upgrades or replacements.
• Diagnostic Transparency via API: The SST DeviceNet API exposes per-connection error counters, bus-off event logs, and node health status registers directly to the host application — enabling real-time fault diagnosis without external network analyzers.
• Low Host CPU Overhead: DPRAM-based host interface offloads all protocol processing to the on-card processor, freeing host CPU cycles for HMI rendering, historian logging, and supervisory control tasks.
• Long-Term Driver Ecosystem: Supported under Windows 10 64-bit with current SST driver packages, extending the operational lifespan of legacy PCI-slot industrial PCs without requiring platform migration.

Quality Assurance & Global Logistics

Every SST-DN3-PCI-2 unit dispatched from our Xiamen, China facility undergoes a structured pre-shipment verification process. Visual inspection confirms PCB integrity, connector condition, and component population against OEM reference documentation. Functional testing validates DeviceNet communication on both channels across all three supported baud rates (125 / 250 / 500 kbps) using a calibrated DeviceNet analyzer. Driver installation and API enumeration are verified on a Windows 10 64-bit test bench prior to packaging.

Units are shipped with full traceability documentation: serial number record, functional test report, and sourcing declaration. CE declaration of conformity and ODVA conformance test records are available upon request. All units carry a 12-month warranty covering manufacturing defects and verified functional failures.

From Xiamen, we dispatch via DHL Express, FedEx International Priority, and UCP freight — with typical transit times of 3–5 business days to Europe and North America, and 2–4 business days to Southeast Asia. Export documentation including commercial invoice, packing list, and HS code declaration (HS 8537.10) is prepared for all international shipments. Expedited same-day dispatch is available for in-stock units confirmed before 14:00 CST.

Contact Information

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