Product Core Brief
- Model:, OEM part number 1120110029
- Brand: Molex Woodhead SST (BradCommunications)
- Series: SST-PB3 PCIe PROFIBUS scanner adapter family
- Core Function: Host two fully isolated PROFIBUS DP master/slave channels with dedicated on-board co-processors; exchange cyclic I/O and acyclic diagnostic data between industrial host PCs and PROFIBUS slave hardware including Rexroth servo drives and tightening controllers.
- Product Type: Standard low-profile PCIe x1 full-height card with dual front D-SUB9 PROFIBUS ports, no external service port
- Key Specs: Two galvanically isolated DP channels | 512 KB RAM / 512 KB flash per channel | 9.6 kbps–12 Mbps baud rate | Max 122 DP slaves per trunk | Windows/Linux driver support | Condition: New Surplus / Load-Tested Refurbished; ⚠️ EOL — manufacturer discontinued
- Suffix breakdown: PB3 = 3rd-gen PROFIBUS co-processor; PCIE = PCI Express x1 bus form factor; 2 = dual independent PROFIBUS network channels (SST-PB3-PCIE-1 = single channel only)
Product Introduction
installs into standard PCIe x1 industrial PC slots to operate two physically separated PROFIBUS DP networks simultaneously, offloading all PROFIBUS protocol processing from the host PC CPU via dedicated per-channel co-processors. It connects Windows/Linux supervisory PCs to Rexroth HCS, HMD, SE311, and LT304 PROFIBUS slave assemblies without shared bus bandwidth contention.This unit differentiates from single-channel SST-PB3-PCIE-1 variants by supporting two segregated PROFIBUS trunks to isolate safety and motion control networks. OEM field logging places its rated MTBF above 95,000 operating hours under continuous 24/7 cabinet runtime at 40 °C ambient.
Key Technical Specifications
| Parameter | Value |
|---|---|
| Host Bus Interface | PCI Express x1, PCIe 1.1 compliant; full/low-profile bracket included |
| PCIe Slot Power Draw | 720 mA @ 3.3 V DC primary rail; no external auxiliary power required |
| Per-Channel Onboard Memory | 512 KB shared cyclic data RAM; 512 KB non-volatile flash for firmware and network config |
| PROFIBUS Physical Interface | Dual independent RS485 D-SUB9 female ports; galvanic isolation per channel |
| Supported PROFIBUS Modes | DP-V0 Class1/Class2 Master; DP-V1 Class1/Class2 Master; single channel can run master + slave concurrently; FDL Layer 2 messaging |
| Per-Channel Network Capacity | Maximum 122 PROFIBUS DP slave nodes; 244 input / 244 output bytes cyclic I/O mapping per slave |
| Diagnostic Indicators | Two independent LED banks (OK / COMM / FAULT) for Channel A and Channel B status reporting |
| Mechanical Dimensions | Standard full-height PCIe card form factor; net unit weight 0.42 kg |
| Continuous Operating Ambient Temp | 0 °C to +60 °C full rated throughput; linear performance derate above +60 °C |
| Storage / Transport Temperature | -40 °C to +85 °C, non-condensing 5–95 % RH humidity range |
| Integrated Protection Circuits | RS485 bus short-circuit clamping, channel-to-chassis galvanic isolation, reverse PCIe power polarity lockout |
| Software Interfaces | CommDTM configuration tool, Windows/Linux DLL libraries, OPC DA server for SCADA integration |
| Supported Operating Systems | Windows 7/8/10/11 32/64-bit; Red Hat / Ubuntu Linux real-time distributions |
| Compliance Certifications | CE, UL, RoHS, EN61000 Class A industrial EMC filtering |
Quality Control Process (Engineer’s Perspective)
- Incoming Verification: Cross-reference serial number against Molex Woodhead OEM 1120110029 part databases; inspect dual front D-SUB9 port pins for bending, PCIe edge connector for oxidation, and status LEDs for dead segments. Photograph front port pinout for field PROFIBUS wiring reference.
- Live Functional Test: Insert card into industrial PCIe test PC paired with simulated Rexroth PROFIBUS slave drive stacks; run 24 hour cyclic I/O data exchange profiles at maximum 12 Mbps baud rate on both channels simultaneously. Use a Fluke 115 signal logger to track PCIe slot current draw and dual-channel data transfer latency consistency.
- Electrical Parameter Test: 500 V Megger insulation test between each PROFIBUS RS485 circuit and card chassis ground (pass threshold >10 MΩ); verify galvanic isolation holds across both independent channels with no cross-talk leakage.
- Dual Channel & Firmware Verification: Flash factory standard firmware via PCIe host driver; upload separate PROFIBUS network maps for Channel A and Channel B, retain full slave configuration tables over a 12 hour PC power-off cycle to validate flash memory retention.
- Final QC & Packaging: Clean PCIe edge connector contacts during refurbishment cycles; fit plastic protective caps over both D-SUB9 ports, seal unit in anti-static PE foam bag, apply dated QC Pass label listing dual-channel throughput, isolation resistance, and independent fault detection test metrics before rigid carton shipping.
Replacement Pitfall Guide
❗ Single/Dual Channel Hardware Mismatch Risk: Single-channel SST-PB3-PCIE-1 cards only support one PROFIBUS trunk. Direct substitution breaks segregated safety and motion network isolation; machine supervisory logic will require full PROFIBUS network redesign to consolidate all slaves onto one bus segment. Confirm two physically separate PROFIBUS trunks exist before swapping variants. Photograph original dual D-SUB trunk wiring termination before card removal to preserve 120 Ω bus resistor placement on each network.❗ PCIe Slot Resource Conflict Hazard: The card allocates dedicated PCIe memory and interrupt resources automatically via plug-and-play. Stacking multiple PCIe communication cards can exceed host PC IRQ limits without 20% resource headroom reserve, triggering random communication dropout during high-speed I/O scans. Recalculate total PCIe bus resource load before adding replacement hardware.❗ Dual Channel Bus Termination Miswiring Risk: Each PROFIBUS channel requires independent 120 Ω termination resistors enabled only at the two physical cable ends of each trunk. Shared termination between Channel A and Channel B creates signal reflection noise that triggers intermittent slave dropout at baud rates above 500 kbps.❗ Industrial PC Chassis Condensation Short-Circuit Risk: Cold-stored cards moved into warm humid control enclosures form PCB trace condensation within two hours. Allow minimum four-hour temperature acclimation before inserting into powered PCIe slots to prevent flash memory corruption and RS485 transceiver permanent failure.❗ ESD Co-Processor Circuit Damage: Onboard flash memory and PROFIBUS ASIC circuits carry low electrostatic discharge tolerance. Always rest the unit on a grounded anti-static mat during PCIe slot insertion or front port cable rewiring, especially in low-humidity cleanroom production environments.Keep these in mind and you’ll cut 90% of rework time.
Compatibility Matrix & Benchmarks
Compatibility Matrix
- SST-PB3-PCIE-1 single-channel PROFIB : Needs Adaptation — split single PROFIBUS trunk into two isolated networks, reconfigure host PC OPC/CommDTM software to register dual independent channel data buffers
- CML40.2-SP-330-NA-NNNN-NW Rexroth SERCOS mot : Direct — PROFIBUS DP slave mode enables bidirectional motion setpoint and fault data exchange via either Channel A or Channel B trunk
- HCS02.1E-W0028-A-03-NNNN integrated serv : Direct — native PROFIBUS DP slave port on drive connects to either isolated D-SUB trunk without external signal conditioning
- SE311 Rexroth tightening control E : Direct — onboard PROFIBUS interface maps torque-angle fastening recipe data to supervisory PC OPC tag memory
