SST SST-PBMS-PCI PROFIBUS Interface Card – SST-PBMS Series

SST SST-PBMS-PCI PROFIBUS Multi-Slave PCI Interface Card — Multi-Node Slave Arbitration in a Single Slot

The SST-PBMS-PCI is a 32-bit PCI form-factor fieldbus interface card engineered to operate as up to eight independent PROFIBUS DP slave nodes from a single host PC slot. Unlike conventional single-slave adapters, this card embeds a dedicated PROFIBUS ASIC that handles all token-ring timing, address arbitration, and cyclic data exchange autonomously — decoupling fieldbus determinism from host OS scheduling latency. The result is a compact, cost-effective gateway architecture for PC-based SCADA, DCS integration, and HIL simulation platforms where multiple slave identities must coexist on one PROFIBUS DP segment.

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Technical Parameters

Hardware Logical Analysis

The SST-PBMS-PCI is built around a purpose-designed PROFIBUS ASIC rather than a generic UART or FPGA soft-core. This architectural choice has measurable consequences for system behavior:

On-board token-ring state machine. The ASIC maintains the PROFIBUS DP token-passing protocol entirely in silicon. When the master polls a slave address managed by this card, the ASIC responds within the protocol-mandated Tset (station delay) window without any interrupt round-trip to the host CPU. Under Windows 10 with default interrupt latency of 1–15 ms, a software-only implementation would routinely miss Tset at baud rates above 1.5 Mbps. The hardware state machine eliminates this failure mode.

Multi-slave address arbitration. Each of the eight slave addresses is maintained as an independent logical entity in the ASIC’s internal register map. The card time-multiplexes responses across addresses within a single PROFIBUS bus cycle, presenting each address to the master as a physically distinct device. The host PC reads and writes each slave’s I/O data buffer via DMA-mapped memory regions, keeping PCI bus transactions off the critical timing path.

Galvanic isolation architecture. The RS-485 transceiver is separated from the PCI logic domain by a 500 V DC opto-isolation barrier. This barrier interrupts ground-loop currents that arise when the host PC chassis ground differs from the field device reference potential — a common condition in large industrial plants where cable runs span multiple electrical panels. The isolation also clamps fast transients (IEC 61000-4-4 EFT/Burst) before they reach the PCI bus, protecting the host motherboard.

EMC design. The PCB uses a four-layer stackup with dedicated ground planes separating the digital PCI domain from the RS-485 analog domain. Ferrite beads on the DB-9 signal lines attenuate common-mode noise above 25 MHz. The card meets EN 55032 Class A radiated and conducted emission limits, making it suitable for installation in industrial control cabinets without additional shielding enclosures.

DMA data transfer. I/O data buffers for all eight slave addresses are mapped into a contiguous PCI BAR (Base Address Register) window. The host application reads process data via direct memory access, avoiding repeated port I/O calls that would serialize access and increase latency. This design keeps host CPU overhead below 2 % even when all eight slave addresses are active at 12 Mbps.

System Integration Benefits

• Slot consolidation: Eight PROFIBUS slave identities on one PCI slot replace up to eight individual single-slave cards, freeing slots for other I/O or communication functions in space-constrained industrial PCs.
• Deterministic response independent of OS jitter: The on-board ASIC guarantees Tset compliance at all supported baud rates regardless of Windows scheduler latency, enabling reliable 12 Mbps operation in non-RTOS environments.
• Transparent diagnostics: Each slave address exposes a DP diagnostic byte accessible via the SST API, allowing the host application to read bus fault status, watchdog timeout events, and parameter error flags without interrupting cyclic data exchange.
• GSD file support: A General Station Description (GSD) file is supplied with the card, enabling PROFIBUS masters — including Siemens STEP 7, TIA Portal, and third-party configurators — to automatically recognize and configure each slave address without manual parameter entry.
• Watchdog supervision: Each slave address implements an independent DP watchdog timer. If the master fails to poll a slave within the configured watchdog interval, that slave’s outputs are set to a safe state defined in the GSD file, preventing uncontrolled actuator behavior during communication loss.
• Flexible I/O mapping: The SST API allows the host application to define the input and output data length for each slave address independently, from 1 byte to 244 bytes, without reflashing firmware. Configuration changes take effect at the next bus cycle.
• Cross-platform SDK: The DLL-based API with documented function calls and C/C++ header files integrates into existing SCADA, MES, or custom HMI applications without requiring proprietary middleware. A .NET wrapper is available for managed-code environments.
• Long-term brownfield compatibility: The SST-PBMS-PCI supports all ten standard PROFIBUS DP baud rates including legacy 9.6 kbps networks, making it suitable for brownfield installations where older masters cannot be upgraded to higher speeds.

Quality Assurance & Global Logistics

Every SST-PBMS-PCI unit dispatched from our Xiamen, China facility is sourced through verified industrial distribution channels and subjected to a structured pre-shipment verification process. Visual inspection confirms PCB integrity, connector seating, and label authenticity against manufacturer reference samples. A functional power-on test verifies PCI bus enumeration and driver recognition under Windows 10. A PROFIBUS loopback communication test at both 1.5 Mbps and 12 Mbps confirms ASIC operation and bus isolation integrity. Units are packed in anti-static ESD bags with foam inserts and a humidity indicator card, then placed in double-wall corrugated cartons rated for international air freight handling.

Shipments originate from Xiamen, China and are dispatched via DHL Express, FedEx International Priority, or UPS Worldwide Expedited depending on destination and customer preference. Standard transit times are 3–5 business days to Europe, 4–6 business days to North America, and 2–3 business days to Southeast Asia. All shipments include a commercial invoice, packing list, and HS code 8537.10 export declaration. Dual-use export compliance is confirmed prior to dispatch for all destinations. A 12-month warranty covers manufacturing defects on new-stock units, with advance replacement available for qualified accounts.

Contact Information

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