SST PB3-VME Modules SST-PB3-VME-2-E

Technical Dossier

Product Details And Specifications

SST PB3-VME Series Technical Notes

The SST PB3-VME series represents SST's (Woodhead Industries / Molex SST) dedicated line of PROFIBUS communication interface boards designed for VMEbus-based industrial control architectures. These modules have achieved significant installed-base penetration across global heavy industry sectors including petrochemical refineries, nuclear power generation facilities, offshore oil & gas platforms, and large-scale chemical processing plants. The PB3-VME series provides a standardized hardware interface between VMEbus backplane systems and PROFIBUS DP/FMS field networks, enabling deterministic real-time communication with distributed I/O, drives, and intelligent field devices. Their long production lifecycle and robust hardware design have made them a critical component in legacy DCS and SCADA infrastructure that continues to operate well beyond original design horizons.

The Evolution of PB3-VME Architecture

The PB3-VME product line was developed during the period when VMEbus (IEEE 1014) was the dominant open-standard backplane architecture for industrial and military embedded computing. Early revisions of the PB3-VME board supported PROFIBUS FMS (Fieldbus Message Specification) alongside DP, reflecting the transitional period in the mid-1990s when both protocol layers were in active deployment. As PROFIBUS DP became the de facto standard for cyclic I/O exchange, later hardware revisions optimized firmware and ASIC resources toward DP Class 1 and Class 2 master functionality.

The -2-E suffix in SST-PB3-VME-2-E denotes the second-generation hardware revision with enhanced EMC compliance and extended operating temperature tolerance, targeting installations in harsh industrial environments. Compatibility considerations are significant for this series: the boards are designed for 6U VME form factor and require a 32-bit VMEbus slot. Integration with VxWorks, LynxOS, and proprietary DCS operating environments was supported through SST's driver SDK. As VMEbus platforms have transitioned to end-of-life status with major DCS vendors, the PB3-VME series has entered a mature/declining lifecycle phase. Long-term maintenance support — including board-level repair, firmware archival, and tested spare provisioning — is now the primary operational requirement for sites running this hardware.

SST PB3-VME Full Catalog & Functionalities (SKU List)

The following SKUs represent the verified PB3-VME series module range. Each entry reflects a distinct hardware configuration or revision within the VMEbus PROFIBUS interface product family.

PROFIBUS DP/FMS Master Modules (VMEbus Interface)

• SST-PB3-VME-2-E: PROFIBUS DP/FMS master, 6U VME, 2-channel, enhanced EMC revision
• SST-PB3-VME-1: PROFIBUS DP/FMS master, 6U VME, single-channel, standard revision
• SST-PB3-VME-2: PROFIBUS DP/FMS master, 6U VME, 2-channel, standard revision
• SST-PB3-VME-1-E: PROFIBUS DP/FMS master, 6U VME, single-channel, enhanced EMC revision

PROFIBUS DP Slave Modules (VMEbus Interface)

• SST-PB3S-VME-1: PROFIBUS DP slave interface, 6U VME, single-channel
• SST-PB3S-VME-2: PROFIBUS DP slave interface, 6U VME, dual-channel

PROFIBUS DP Master — PCI Bus Variants (Cross-Reference / Successor Platform)

• SST-PB3-PCI-1: PROFIBUS DP/FMS master, PCI bus, single-channel — PCI migration path from VME
• SST-PB3-PCI-2: PROFIBUS DP/FMS master, PCI bus, dual-channel
• SST-PB3-PCI-1-E: PROFIBUS DP/FMS master, PCI bus, single-channel, enhanced revision
• SST-PB3-PCI-2-E: PROFIBUS DP/FMS master, PCI bus, dual-channel, enhanced revision

PROFIBUS DP Master — ISA Bus Variants (Legacy Reference)

• SST-PB3-ISA-1: PROFIBUS DP/FMS master, ISA bus, single-channel, early-generation hardware
• SST-PB3-ISA-2: PROFIBUS DP/FMS master, ISA bus, dual-channel

DeviceNet / Multi-Protocol Variants (SST Series Cross-Reference)

• SST-DN3-VME-2: DeviceNet master/slave, 6U VME, dual-channel — same VME platform, alternate protocol
• SST-DN3-PCI-2: DeviceNet master/slave, PCI bus, dual-channel — successor bus platform
• SST-PBMR-PCI: PROFIBUS DP master/slave redundant interface, PCI — high-availability variant

Sourcing Hard-to-Find & Obsolete PB3-VME Parts

The SST PB3-VME series has been formally discontinued by Molex SST. OEM replacement parts are no longer available through standard distribution channels. For facilities operating VMEbus-based DCS or SCADA systems with PB3-VME boards installed, unplanned board failure creates a critical path risk with no direct OEM replacement option.

Quality Control for the PB3-VME Range

VMEbus communication boards present specific test challenges due to their backplane-dependent operation and PROFIBUS ASIC-level diagnostics. DriveKNMS applies the following test protocol to all PB3-VME units prior to shipment:

• VMEbus backplane insertion test using a calibrated 6U VME test chassis with A32/D32 address/data verification
• PROFIBUS DP master functional test: GSD file loading, slave address assignment, cyclic I/O exchange verification at 1.5 Mbit/s and 12 Mbit/s baud rates
• PROFIBUS FMS connection test where firmware revision supports FMS layer
• Dual-channel isolation test for -2 and -2-E variants to confirm independent channel operation
• EMC pre-screening for enhanced (-E) revision boards per EN 61000-4 immunity levels
• Firmware version identification and archival against SST SDK compatibility matrix
• 72-hour burn-in at operating temperature range (0°C to +60°C) prior to final inspection