The Molex SST SST-PB3-PCIE-2 is a dual-channel, high-performance PROFIBUS network interface card designed for PCI Express (PCIe) x1 slots. It enables industrial computers, human-machine interfaces (HMIs), and soft-PLC control architectures to connect directly to PROFIBUS DP and PROFIBUS FMS industrial networks. Equipped with an onboard processor and dedicated memory, the card executes complete network protocol timing and token-rotation handling locally, shielding the host computer’s operating system from real-time network overhead.

Technical Specifications

Commercial and Availability Logistics

• Product Condition: New Original (New Surplus) in original factory box, or Certified Refurbished (fully communication-tested on active multi-node networks).
• Warranty: 12-month complete technical warranty covering hardware components and transceiver interfaces.
• Availability: In stock. Standard global processing and shipping turnaround is 1 to 3 business days.
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• Pricing Notice: Listed pricing represents a market baseline and is subject to fluctuating manufacturing lifecycle steps and inventory levels. Contact our sales department for a firm, written quote.

Engineering Considerations and Field Deployment Notes

Host CPU Offloading and Real-Time Determinism

The core advantage of the SST-PB3-PCIE-2 architecture is its integrated memory allocation block. Unlike passive interface pass-through cards, this module handles cyclic input/output database management, DP-V1 acyclic parameterization messaging, and strict sub-millisecond network frame timing internally. The host operating system reads and writes to a synchronized dual-port RAM interface, preventing system latency spikes on the PC from triggering PROFIBUS slave watchdog dropouts.

Shielding and RS-485 Segment Grounding

When operating at higher transmission rates (e.g., 12 Mbps), the physical layer is highly sensitive to signal reflections and electromagnetic interference (EMI). Always utilize standard, high-quality DB9 connectors equipped with active termination switches. Ensure the PROFIBUS cable shield is exposed and firmly clamped into the metal shell of the connector hood to provide a low-impedance path to ground, bypassing the delicate communication transceivers on the PCIe card assembly.

Driver Configuration and Version Matching

When preparing commissioning profiles inside engineering tool packages (such as console configuration managers or soft-PLC tools), ensure the installed SST driver version matches the exact compilation requirements of the host application. Upgrading from legacy systems running Windows 7 to Windows 10 architectures requires applying the updated Molex software suite to enable proper memory mapping through the newer OS kernel structure.

Frequently Asked Questions

Can the two ports run separate network master tasks simultaneously?

Yes. The dual-channel hardware platform architecture isolates the processing loops for both DB9 interfaces. Channel 1 can execute as a PROFIBUS DP Master managing local I/O drops, while Channel 2 operates completely independently as a DP Master or DP Slave linked to an adjacent factory network framework.

What is the maximum number of slave stations supported per channel?

Under standard PROFIBUS DP network constraints, each channel can map up to 125 slave devices using appropriate network segment repeaters, within the physical limits dictated by the internal project memory buffer size allocated during configuration setup.

How do I troubleshoot a steady amber status indicator light near the DB9 interface?

An amber status light typically points to a configuration parameter error or a disconnected network line topology. Verify that at least one slave node is actively powered on and matching the network baud rate configured inside the master project profile.

Technical Notice: Always cross-reference your host motherboard PCIe slot mechanical alignments, total system I/O byte constraints, and GSD file library versions with the official Molex SST network communication manual before finalizing a field installation sequence.